improved OTR verification part one

12 files changed, 403 insertions, 352 deletions

diff --git a/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java b/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java
index 3894e205..64434631 100644
--- a/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java
+++ b/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java
@@ -34,7 +34,7 @@ import net.java.otr4j.crypto.OtrCryptoException;
 import net.java.otr4j.session.InstanceTag;
 import net.java.otr4j.session.SessionID;
 
-public class OtrEngine implements OtrEngineHost {
+public class OtrEngine extends OtrCryptoEngineImpl implements OtrEngineHost {
 
 	private Account account;
 	private OtrPolicy otrPolicy;
@@ -258,10 +258,10 @@ public class OtrEngine implements OtrEngineHost {
 			Conversation conversation = this.mXmppConnectionService.find(this.account,jid);
 			if (conversation!=null) {
 				if (approved) {
-					conversation.getContact().addOtrFingerprint(CryptoHelper.prettifyFingerprint(fingerprint));
+					conversation.getContact().addOtrFingerprint(fingerprint);
 				}
 				conversation.smp().hint = null;
-				conversation.smp().status = Conversation.Smp.STATUS_FINISHED;
+				conversation.smp().status = Conversation.Smp.STATUS_VERIFIED;
 				mXmppConnectionService.updateConversationUi();
 				mXmppConnectionService.syncRosterToDisk(conversation.getAccount());
 			}
diff --git a/src/main/java/eu/siacs/conversations/entities/Contact.java b/src/main/java/eu/siacs/conversations/entities/Contact.java
index af26981e..698e0322 100644
--- a/src/main/java/eu/siacs/conversations/entities/Contact.java
+++ b/src/main/java/eu/siacs/conversations/entities/Contact.java
@@ -453,7 +453,7 @@ public class Contact implements ListItem, Blockable {
 	public String getShareableUri() {
 		if (getOtrFingerprints().size() >= 1) {
 			String otr = getOtrFingerprints().get(0);
-			return "xmpp:" + getJid().toBareJid().toString() + "?otr-fingerprint=" + otr.replace(" ", "");
+			return "xmpp:" + getJid().toBareJid().toString() + "?otr-fingerprint=" + otr;
 		} else {
 			return "xmpp:" + getJid().toBareJid().toString();
 		}
diff --git a/src/main/java/eu/siacs/conversations/entities/Conversation.java b/src/main/java/eu/siacs/conversations/entities/Conversation.java
index 1f9afa65..a88984fb 100644
--- a/src/main/java/eu/siacs/conversations/entities/Conversation.java
+++ b/src/main/java/eu/siacs/conversations/entities/Conversation.java
@@ -436,30 +436,29 @@ public class Conversation extends AbstractEntity implements Blockable {
 		return this.otrSession != null;
 	}
 
-	public String getOtrFingerprint() {
+	public synchronized String getOtrFingerprint() {
 		if (this.otrFingerprint == null) {
 			try {
-				if (getOtrSession() == null) {
-					return "";
+				if (getOtrSession() == null || getOtrSession().getSessionStatus() != SessionStatus.ENCRYPTED) {
+					return null;
 				}
-				DSAPublicKey remotePubKey = (DSAPublicKey) getOtrSession()
-					.getRemotePublicKey();
-				StringBuilder builder = new StringBuilder(
-						new OtrCryptoEngineImpl().getFingerprint(remotePubKey));
-				builder.insert(8, " ");
-				builder.insert(17, " ");
-				builder.insert(26, " ");
-				builder.insert(35, " ");
-				this.otrFingerprint = builder.toString();
+				DSAPublicKey remotePubKey = (DSAPublicKey) getOtrSession().getRemotePublicKey();
+				this.otrFingerprint = getAccount().getOtrEngine().getFingerprint(remotePubKey);
 			} catch (final OtrCryptoException | UnsupportedOperationException ignored) {
-
+				return null;
 			}
 		}
 		return this.otrFingerprint;
 	}
 
-	public void verifyOtrFingerprint() {
-		getContact().addOtrFingerprint(getOtrFingerprint());
+	public boolean verifyOtrFingerprint() {
+		final String fingerprint = getOtrFingerprint();
+		if (fingerprint != null) {
+			getContact().addOtrFingerprint(fingerprint);
+			return true;
+		} else {
+			return false;
+		}
 	}
 
 	public boolean isOtrFingerprintVerified() {
@@ -708,7 +707,7 @@ public class Conversation extends AbstractEntity implements Blockable {
 		public static final int STATUS_CONTACT_REQUESTED = 1;
 		public static final int STATUS_WE_REQUESTED = 2;
 		public static final int STATUS_FAILED = 3;
-		public static final int STATUS_FINISHED = 4;
+		public static final int STATUS_VERIFIED = 4;
 
 		public String secret = null;
 		public String hint = null;
diff --git a/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java b/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java
index 7d29314b..5fa61491 100644
--- a/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java
+++ b/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java
@@ -22,7 +22,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	private static DatabaseBackend instance = null;
 
 	private static final String DATABASE_NAME = "history";
-	private static final int DATABASE_VERSION = 12;
+	private static final int DATABASE_VERSION = 13;
 
 	private static String CREATE_CONTATCS_STATEMENT = "create table "
 			+ Contact.TABLENAME + "(" + Contact.ACCOUNT + " TEXT, "
@@ -126,6 +126,10 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 					+ Message.SERVER_MSG_ID + " TEXT");
 		}
+		if (oldVersion < 13 && newVersion >= 13) {
+			db.execSQL("delete from "+Contact.TABLENAME);
+			db.execSQL("update "+Account.TABLENAME+" set "+Account.ROSTERVERSION+" = NULL");
+		}
 	}
 
 	public static synchronized DatabaseBackend getInstance(Context context) {
diff --git a/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java b/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java
index b195f2f1..657ae75b 100644
--- a/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java
@@ -37,6 +37,7 @@ import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.ListItem;
 import eu.siacs.conversations.services.XmppConnectionService.OnAccountUpdate;
 import eu.siacs.conversations.services.XmppConnectionService.OnRosterUpdate;
+import eu.siacs.conversations.utils.CryptoHelper;
 import eu.siacs.conversations.utils.UIHelper;
 import eu.siacs.conversations.xmpp.OnUpdateBlocklist;
 import eu.siacs.conversations.xmpp.jid.InvalidJidException;
@@ -315,7 +316,7 @@ public class ContactDetailsActivity extends XmppActivity implements OnAccountUpd
 				.findViewById(R.id.button_remove);
 			remove.setVisibility(View.VISIBLE);
 			keyType.setText("OTR Fingerprint");
-			key.setText(otrFingerprint);
+			key.setText(CryptoHelper.prettifyFingerprint(otrFingerprint));
 			keys.addView(view);
 			remove.setOnClickListener(new OnClickListener() {
 
@@ -396,8 +397,7 @@ public class ContactDetailsActivity extends XmppActivity implements OnAccountUpd
 					public void onClick(DialogInterface dialog, int which) {
 						if (contact.deleteOtrFingerprint(fingerprint)) {
 							populateView();
-							xmppConnectionService.syncRosterToDisk(contact
-									.getAccount());
+							xmppConnectionService.syncRosterToDisk(contact.getAccount());
 						}
 					}
 
diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java b/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
index c4c3c354..71074d3d 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
@@ -27,6 +27,8 @@ import android.widget.PopupMenu;
 import android.widget.PopupMenu.OnMenuItemClickListener;
 import android.widget.Toast;
 
+import net.java.otr4j.session.SessionStatus;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -555,6 +557,41 @@ public class ConversationActivity extends XmppActivity
 		attachFilePopup.show();
 	}
 
+	public void verifyOtrSessionDialog(final Conversation conversation, View view) {
+		if (!conversation.hasValidOtrSession() || conversation.getOtrSession().getSessionStatus() != SessionStatus.ENCRYPTED) {
+			Toast.makeText(this, R.string.otr_session_not_started, Toast.LENGTH_LONG).show();
+			return;
+		}
+		if (view == null) {
+			return;
+		}
+		PopupMenu popup = new PopupMenu(this, view);
+		popup.inflate(R.menu.verification_choices);
+		popup.setOnMenuItemClickListener(new OnMenuItemClickListener() {
+			@Override
+			public boolean onMenuItemClick(MenuItem menuItem) {
+				Intent intent = new Intent(ConversationActivity.this, VerifyOTRActivity.class);
+				intent.setAction(VerifyOTRActivity.ACTION_VERIFY_CONTACT);
+				intent.putExtra("contact", conversation.getContact().getJid().toBareJid().toString());
+				intent.putExtra("account", conversation.getAccount().getJid().toBareJid().toString());
+				switch (menuItem.getItemId()) {
+					case R.id.scan_fingerprint:
+						intent.putExtra("mode",VerifyOTRActivity.MODE_SCAN_FINGERPRINT);
+						break;
+					case R.id.ask_question:
+						intent.putExtra("mode",VerifyOTRActivity.MODE_ASK_QUESTION);
+						break;
+					case R.id.manual_verification:
+						intent.putExtra("mode",VerifyOTRActivity.MODE_MANUAL_VERIFICATION);
+						break;
+				}
+				startActivity(intent);
+				return true;
+			}
+		});
+		popup.show();
+	}
+
 	protected void selectEncryptionDialog(final Conversation conversation) {
 		View menuItemView = findViewById(R.id.action_security);
 		if (menuItemView == null) {
diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
index 39dfd4db..c3b47d76 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
@@ -204,13 +204,7 @@ public class ConversationFragment extends Fragment {
 
 		@Override
 		public void onClick(View v) {
-			if (conversation.getOtrFingerprint() != null) {
-				Intent intent = new Intent(getActivity(), VerifyOTRActivity.class);
-				intent.setAction(VerifyOTRActivity.ACTION_VERIFY_CONTACT);
-				intent.putExtra("contact", conversation.getContact().getJid().toBareJid().toString());
-				intent.putExtra("account", conversation.getAccount().getJid().toBareJid().toString());
-				startActivity(intent);
-			}
+			activity.verifyOtrSessionDialog(conversation,v);
 		}
 	};
 	private ConcurrentLinkedQueue<Message> mEncryptedMessages = new ConcurrentLinkedQueue<>();
@@ -796,7 +790,17 @@ public class ConversationFragment extends Fragment {
 
 	protected void makeFingerprintWarning() {
 		if (conversation.smpRequested()) {
-			showSnackbar(R.string.smp_requested, R.string.verify, clickToVerify);
+			showSnackbar(R.string.smp_requested, R.string.verify, new OnClickListener() {
+				@Override
+				public void onClick(View view) {
+					Intent intent = new Intent(activity, VerifyOTRActivity.class);
+					intent.setAction(VerifyOTRActivity.ACTION_VERIFY_CONTACT);
+					intent.putExtra("contact", conversation.getContact().getJid().toBareJid().toString());
+					intent.putExtra("account", conversation.getAccount().getJid().toBareJid().toString());
+					intent.putExtra("mode",VerifyOTRActivity.MODE_ANSWER_QUESTION);
+					startActivity(intent);
+				}
+			});
 		} else if (conversation.hasValidOtrSession() && (conversation.getOtrSession().getSessionStatus() == SessionStatus.ENCRYPTED)
 				&& (!conversation.isOtrFingerprintVerified())) {
 			showSnackbar(R.string.unknown_otr_fingerprint, R.string.verify, clickToVerify);
diff --git a/src/main/java/eu/siacs/conversations/ui/VerifyOTRActivity.java b/src/main/java/eu/siacs/conversations/ui/VerifyOTRActivity.java
index e5775ab0..8fffbaac 100644
--- a/src/main/java/eu/siacs/conversations/ui/VerifyOTRActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/VerifyOTRActivity.java
@@ -1,14 +1,15 @@
 package eu.siacs.conversations.ui;
 
+import android.app.ActionBar;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
-import android.view.Menu;
-import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 import android.widget.Toast;
@@ -32,57 +33,56 @@ import eu.siacs.conversations.xmpp.jid.Jid;
 public class VerifyOTRActivity extends XmppActivity implements XmppConnectionService.OnConversationUpdate {
 
 	public static final String ACTION_VERIFY_CONTACT = "verify_contact";
+	public static final int MODE_SCAN_FINGERPRINT = - 0x0502;
+	public static final int MODE_ASK_QUESTION = 0x0503;
+	public static final int MODE_ANSWER_QUESTION = 0x0504;
+	public static final int MODE_MANUAL_VERIFICATION = 0x0505;
 
-	private RelativeLayout mVerificationAreaOne;
-	private RelativeLayout mVerificationAreaTwo;
-	private TextView mErrorNoSession;
-	private TextView mRemoteJid;
+	private LinearLayout mManualVerificationArea;
+	private LinearLayout mSmpVerificationArea;
 	private TextView mRemoteFingerprint;
 	private TextView mYourFingerprint;
-	private EditText mSharedSecretHint;
-	private EditText mSharedSecretSecret;
-	private Button mButtonScanQrCode;
-	private Button mButtonShowQrCode;
-	private Button mButtonSharedSecretPositive;
-	private Button mButtonSharedSecretNegative;
+	private TextView mVerificationExplain;
 	private TextView mStatusMessage;
+	private TextView mSharedSecretHint;
+	private EditText mSharedSecretHintEditable;
+	private EditText mSharedSecretSecret;
+	private Button mLeftButton;
+	private Button mRightButton;
 	private Account mAccount;
 	private Conversation mConversation;
+	private int mode = MODE_MANUAL_VERIFICATION;
+	private XmppUri mPendingUri = null;
 
 	private DialogInterface.OnClickListener mVerifyFingerprintListener = new DialogInterface.OnClickListener() {
 
 		@Override
 		public void onClick(DialogInterface dialogInterface, int click) {
 			mConversation.verifyOtrFingerprint();
-			updateView();
 			xmppConnectionService.syncRosterToDisk(mConversation.getAccount());
+			Toast.makeText(VerifyOTRActivity.this,R.string.verified,Toast.LENGTH_SHORT).show();
+			finish();
 		}
 	};
 
-	private View.OnClickListener mShowQrCodeListener = new View.OnClickListener() {
-		@Override
-		public void onClick(final View view) {
-			showQrCode();
-		}
-	};
-
-	private View.OnClickListener mScanQrCodeListener = new View.OnClickListener() {
-
-		@Override
-		public void onClick(View view) {
-			new IntentIntegrator(VerifyOTRActivity.this).initiateScan();
-		}
-
-	};
-
 	private View.OnClickListener mCreateSharedSecretListener = new View.OnClickListener() {
 		@Override
 		public void onClick(final View view) {
 			if (isAccountOnline()) {
-				final String question = mSharedSecretHint.getText().toString();
+				final String question = mSharedSecretHintEditable.getText().toString();
 				final String secret = mSharedSecretSecret.getText().toString();
-				initSmp(question, secret);
-				updateView();
+				if (question.trim().isEmpty()) {
+					mSharedSecretHintEditable.requestFocus();
+					mSharedSecretHintEditable.setError(getString(R.string.shared_secret_hint_should_not_be_empty));
+				} else if (secret.trim().isEmpty()) {
+					mSharedSecretSecret.requestFocus();
+					mSharedSecretSecret.setError(getString(R.string.shared_secret_can_not_be_empty));
+				} else {
+					mSharedSecretSecret.setError(null);
+					mSharedSecretHintEditable.setError(null);
+					initSmp(question, secret);
+					updateView();
+				}
 			}
 		}
 	};
@@ -100,7 +100,7 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 		@Override
 		public void onClick(View view) {
 			if (isAccountOnline()) {
-				final String question = mSharedSecretHint.getText().toString();
+				final String question = mSharedSecretHintEditable.getText().toString();
 				final String secret = mSharedSecretSecret.getText().toString();
 				respondSmp(question, secret);
 				updateView();
@@ -124,14 +124,14 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 		}
 	};
 
-	private XmppUri mPendingUri = null;
-
 	protected boolean initSmp(final String question, final String secret) {
 		final Session session = mConversation.getOtrSession();
 		if (session!=null) {
 			try {
 				session.initSmp(question, secret);
 				mConversation.smp().status = Conversation.Smp.STATUS_WE_REQUESTED;
+				mConversation.smp().secret = secret;
+				mConversation.smp().hint = question;
 				return true;
 			} catch (OtrException e) {
 				return false;
@@ -172,15 +172,17 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 		}
 	}
 
-	protected void verifyWithUri(XmppUri uri) {
+	protected boolean verifyWithUri(XmppUri uri) {
 		Contact contact = mConversation.getContact();
 		if (this.mConversation.getContact().getJid().equals(uri.getJid()) && uri.getFingerprint() != null) {
 			contact.addOtrFingerprint(uri.getFingerprint());
 			Toast.makeText(this,R.string.verified,Toast.LENGTH_SHORT).show();
 			updateView();
 			xmppConnectionService.syncRosterToDisk(contact.getAccount());
+			return true;
 		} else {
 			Toast.makeText(this,R.string.could_not_verify_fingerprint,Toast.LENGTH_SHORT).show();
+			return false;
 		}
 	}
 
@@ -194,7 +196,7 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 	}
 
 	protected boolean handleIntent(Intent intent) {
-		if (intent.getAction().equals(ACTION_VERIFY_CONTACT)) {
+		if (intent != null && intent.getAction().equals(ACTION_VERIFY_CONTACT)) {
 			try {
 				this.mAccount = this.xmppConnectionService.findAccountByJid(Jid.fromString(intent.getExtras().getString("account")));
 			} catch (final InvalidJidException ignored) {
@@ -208,6 +210,11 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 			} catch (final InvalidJidException ignored) {
 				return false;
 			}
+			this.mode = intent.getIntExtra("mode", MODE_MANUAL_VERIFICATION);
+			if (this.mode == MODE_SCAN_FINGERPRINT) {
+				new IntentIntegrator(this).initiateScan();
+				return false;
+			}
 			return true;
 		} else {
 			return false;
@@ -223,9 +230,12 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 				XmppUri uri = new XmppUri(data);
 				if (xmppConnectionServiceBound) {
 					verifyWithUri(uri);
+					finish();
 				} else {
 					this.mPendingUri = uri;
 				}
+			} else {
+				finish();
 			}
 		}
 		super.onActivityResult(requestCode, requestCode, intent);
@@ -234,84 +244,139 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 	@Override
 	protected void onBackendConnected() {
 		if (handleIntent(getIntent())) {
-			if (mPendingUri!=null) {
-				verifyWithUri(mPendingUri);
-				mPendingUri = null;
-			}
 			updateView();
+		} else if (mPendingUri!=null) {
+			verifyWithUri(mPendingUri);
+			finish();
+			mPendingUri = null;
 		}
+		setIntent(null);
 	}
 
 	protected void updateView() {
 		if (this.mConversation.hasValidOtrSession()) {
+			final ActionBar actionBar = getActionBar();
+			this.mVerificationExplain.setText(R.string.no_otr_session_found);
 			invalidateOptionsMenu();
-			this.mVerificationAreaOne.setVisibility(View.VISIBLE);
-			this.mVerificationAreaTwo.setVisibility(View.VISIBLE);
-			this.mErrorNoSession.setVisibility(View.GONE);
-			this.mYourFingerprint.setText(CryptoHelper.prettifyFingerprint(this.mAccount.getOtrFingerprint()));
-			this.mRemoteFingerprint.setText(this.mConversation.getOtrFingerprint());
-			this.mRemoteJid.setText(this.mConversation.getContact().getJid().toBareJid().toString());
-			Conversation.Smp smp = mConversation.smp();
-			Session session = mConversation.getOtrSession();
-			if (mConversation.isOtrFingerprintVerified()) {
-				deactivateButton(mButtonScanQrCode, R.string.verified);
-			} else {
-				activateButton(mButtonScanQrCode, R.string.scan_qr_code, mScanQrCodeListener);
+			switch(this.mode) {
+				case MODE_ASK_QUESTION:
+					if (actionBar != null ) {
+						actionBar.setTitle(R.string.ask_question);
+					}
+					this.updateViewAskQuestion();
+					break;
+				case MODE_ANSWER_QUESTION:
+					if (actionBar != null ) {
+						actionBar.setTitle(R.string.smp_requested);
+					}
+					this.updateViewAnswerQuestion();
+					break;
+				case MODE_MANUAL_VERIFICATION:
+				default:
+					if (actionBar != null ) {
+						actionBar.setTitle(R.string.manually_verify);
+					}
+					this.updateViewManualVerification();
+					break;
 			}
-			if (smp.status == Conversation.Smp.STATUS_NONE) {
-				activateButton(mButtonSharedSecretPositive, R.string.create, mCreateSharedSecretListener);
-				deactivateButton(mButtonSharedSecretNegative, R.string.cancel);
-				this.mSharedSecretHint.setFocusableInTouchMode(true);
-				this.mSharedSecretSecret.setFocusableInTouchMode(true);
-				this.mSharedSecretSecret.setText("");
-				this.mSharedSecretHint.setText("");
-				this.mSharedSecretHint.setVisibility(View.VISIBLE);
-				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
+		} else {
+			this.mManualVerificationArea.setVisibility(View.GONE);
+			this.mSmpVerificationArea.setVisibility(View.GONE);
+		}
+	}
+
+	protected void updateViewManualVerification() {
+		this.mVerificationExplain.setText(R.string.manual_verification_explanation);
+		this.mManualVerificationArea.setVisibility(View.VISIBLE);
+		this.mSmpVerificationArea.setVisibility(View.GONE);
+		this.mYourFingerprint.setText(CryptoHelper.prettifyFingerprint(this.mAccount.getOtrFingerprint()));
+		this.mRemoteFingerprint.setText(CryptoHelper.prettifyFingerprint(this.mConversation.getOtrFingerprint()));
+		if (this.mConversation.isOtrFingerprintVerified()) {
+			deactivateButton(this.mRightButton,R.string.verified);
+			activateButton(this.mLeftButton,R.string.cancel,this.mFinishListener);
+		} else {
+			activateButton(this.mLeftButton,R.string.cancel,this.mFinishListener);
+			activateButton(this.mRightButton,R.string.verify, new View.OnClickListener() {
+				@Override
+				public void onClick(View view) {
+					showManuallyVerifyDialog();
+				}
+			});
+		}
+	}
+
+	protected void updateViewAskQuestion() {
+		this.mManualVerificationArea.setVisibility(View.GONE);
+		this.mSmpVerificationArea.setVisibility(View.VISIBLE);
+		this.mVerificationExplain.setText(R.string.smp_explain_question);
+		final int smpStatus = this.mConversation.smp().status;
+		switch (smpStatus) {
+			case Conversation.Smp.STATUS_WE_REQUESTED:
 				this.mStatusMessage.setVisibility(View.GONE);
-			} else if (smp.status == Conversation.Smp.STATUS_CONTACT_REQUESTED) {
-				this.mSharedSecretHint.setFocusable(false);
-				this.mSharedSecretHint.setText(smp.hint);
-				this.mSharedSecretSecret.setFocusableInTouchMode(true);
-				this.mSharedSecretHint.setVisibility(View.VISIBLE);
+				this.mSharedSecretHintEditable.setVisibility(View.VISIBLE);
 				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
+				this.mSharedSecretHintEditable.setText(this.mConversation.smp().hint);
+				this.mSharedSecretSecret.setText(this.mConversation.smp().secret);
+				this.activateButton(this.mLeftButton, R.string.cancel, this.mCancelSharedSecretListener);
+				this.deactivateButton(this.mRightButton, R.string.in_progress);
+				break;
+			case Conversation.Smp.STATUS_FAILED:
 				this.mStatusMessage.setVisibility(View.GONE);
-				deactivateButton(mButtonSharedSecretNegative, R.string.cancel);
-				activateButton(mButtonSharedSecretPositive, R.string.respond, mRespondSharedSecretListener);
-			} else if (smp.status == Conversation.Smp.STATUS_FAILED) {
-				activateButton(mButtonSharedSecretNegative, R.string.cancel, mFinishListener);
-				activateButton(mButtonSharedSecretPositive, R.string.try_again, mRetrySharedSecretListener);
-				this.mSharedSecretHint.setVisibility(View.GONE);
+				this.mSharedSecretHintEditable.setVisibility(View.VISIBLE);
+				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
+				this.mSharedSecretSecret.requestFocus();
+				this.mSharedSecretSecret.setError(getString(R.string.secrets_do_not_match));
+				this.deactivateButton(this.mLeftButton, R.string.cancel);
+				this.activateButton(this.mRightButton, R.string.try_again, this.mRetrySharedSecretListener);
+				break;
+			case Conversation.Smp.STATUS_VERIFIED:
+				this.mSharedSecretHintEditable.setText("");
+				this.mSharedSecretHintEditable.setVisibility(View.GONE);
+				this.mSharedSecretSecret.setText("");
 				this.mSharedSecretSecret.setVisibility(View.GONE);
 				this.mStatusMessage.setVisibility(View.VISIBLE);
-				this.mStatusMessage.setText(R.string.secrets_do_not_match);
-				this.mStatusMessage.setTextColor(getWarningTextColor());
-			} else if (smp.status == Conversation.Smp.STATUS_FINISHED) {
-				this.mSharedSecretHint.setText("");
+				this.deactivateButton(this.mLeftButton, R.string.cancel);
+				this.activateButton(this.mRightButton, R.string.finish, this.mFinishListener);
+				break;
+			default:
+				this.mStatusMessage.setVisibility(View.GONE);
+				this.mSharedSecretHintEditable.setVisibility(View.VISIBLE);
+				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
+				this.activateButton(this.mLeftButton,R.string.cancel,this.mFinishListener);
+				this.activateButton(this.mRightButton, R.string.ask_question, this.mCreateSharedSecretListener);
+				break;
+		}
+	}
+
+	protected void updateViewAnswerQuestion() {
+		this.mManualVerificationArea.setVisibility(View.GONE);
+		this.mSmpVerificationArea.setVisibility(View.VISIBLE);
+		this.mVerificationExplain.setText(R.string.smp_explain_answer);
+		this.mSharedSecretHintEditable.setVisibility(View.GONE);
+		this.mSharedSecretHint.setVisibility(View.VISIBLE);
+		this.deactivateButton(this.mLeftButton, R.string.cancel);
+		final int smpStatus = this.mConversation.smp().status;
+		switch (smpStatus) {
+			case Conversation.Smp.STATUS_CONTACT_REQUESTED:
+				this.mStatusMessage.setVisibility(View.GONE);
+				this.mSharedSecretHint.setText(this.mConversation.smp().hint);
+				this.activateButton(this.mRightButton,R.string.respond,this.mRespondSharedSecretListener);
+				break;
+			case Conversation.Smp.STATUS_VERIFIED:
+				this.mSharedSecretHintEditable.setText("");
+				this.mSharedSecretHintEditable.setVisibility(View.GONE);
 				this.mSharedSecretHint.setVisibility(View.GONE);
 				this.mSharedSecretSecret.setText("");
 				this.mSharedSecretSecret.setVisibility(View.GONE);
 				this.mStatusMessage.setVisibility(View.VISIBLE);
-				this.mStatusMessage.setTextColor(getPrimaryColor());
-				deactivateButton(mButtonSharedSecretNegative, R.string.cancel);
-				if (mConversation.isOtrFingerprintVerified()) {
-					activateButton(mButtonSharedSecretPositive, R.string.finish, mFinishListener);
-					this.mStatusMessage.setText(R.string.verified);
-				} else {
-					activateButton(mButtonSharedSecretPositive,R.string.reset,mRetrySharedSecretListener);
-					this.mStatusMessage.setText(R.string.secret_accepted);
-				}
-			} else if (session != null && session.isSmpInProgress()) {
-				deactivateButton(mButtonSharedSecretPositive, R.string.in_progress);
-				activateButton(mButtonSharedSecretNegative, R.string.cancel, mCancelSharedSecretListener);
-				this.mSharedSecretHint.setVisibility(View.VISIBLE);
-				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
-				this.mSharedSecretHint.setFocusable(false);
-				this.mSharedSecretSecret.setFocusable(false);
-			}
-		} else {
-			this.mVerificationAreaOne.setVisibility(View.GONE);
-			this.mVerificationAreaTwo.setVisibility(View.GONE);
-			this.mErrorNoSession.setVisibility(View.VISIBLE);
+				this.activateButton(this.mRightButton, R.string.finish, this.mFinishListener);
+				break;
+			case Conversation.Smp.STATUS_FAILED:
+			default:
+				this.mSharedSecretSecret.requestFocus();
+				this.mSharedSecretSecret.setError(getString(R.string.secrets_do_not_match));
+				this.activateButton(this.mRightButton,R.string.finish,this.mFinishListener);
+				break;
 		}
 	}
 
@@ -334,39 +399,16 @@ public class VerifyOTRActivity extends XmppActivity implements XmppConnectionSer
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_verify_otr);
 		this.mRemoteFingerprint = (TextView) findViewById(R.id.remote_fingerprint);
-		this.mRemoteJid = (TextView) findViewById(R.id.remote_jid);
 		this.mYourFingerprint = (TextView) findViewById(R.id.your_fingerprint);
-		this.mButtonSharedSecretNegative = (Button) findViewById(R.id.button_shared_secret_negative);
-		this.mButtonSharedSecretPositive = (Button) findViewById(R.id.button_shared_secret_positive);
-		this.mButtonScanQrCode = (Button) findViewById(R.id.button_scan_qr_code);
-		this.mButtonShowQrCode = (Button) findViewById(R.id.button_show_qr_code);
-		this.mButtonShowQrCode.setOnClickListener(this.mShowQrCodeListener);
+		this.mLeftButton = (Button) findViewById(R.id.left_button);
+		this.mRightButton = (Button) findViewById(R.id.right_button);
+		this.mVerificationExplain = (TextView) findViewById(R.id.verification_explanation);
+		this.mStatusMessage = (TextView) findViewById(R.id.status_message);
 		this.mSharedSecretSecret = (EditText) findViewById(R.id.shared_secret_secret);
-		this.mSharedSecretHint = (EditText) findViewById(R.id.shared_secret_hint);
-		this.mStatusMessage= (TextView) findViewById(R.id.status_message);
-		this.mVerificationAreaOne = (RelativeLayout) findViewById(R.id.verification_area_one);
-		this.mVerificationAreaTwo = (RelativeLayout) findViewById(R.id.verification_area_two);
-		this.mErrorNoSession = (TextView) findViewById(R.id.error_no_session);
-	}
-
-	@Override
-	public boolean onCreateOptionsMenu(Menu menu) {
-		getMenuInflater().inflate(R.menu.verify_otr, menu);
-		if (mConversation != null && mConversation.isOtrFingerprintVerified()) {
-			MenuItem manuallyVerifyItem = menu.findItem(R.id.manually_verify);
-			manuallyVerifyItem.setVisible(false);
-		}
-		return true;
-	}
-
-	@Override
-	public boolean onOptionsItemSelected(MenuItem menuItem) {
-		if (menuItem.getItemId() == R.id.manually_verify) {
-			showManuallyVerifyDialog();
-			return true;
-		} else {
-			return super.onOptionsItemSelected(menuItem);
-		}
+		this.mSharedSecretHintEditable = (EditText) findViewById(R.id.shared_secret_hint_editable);
+		this.mSharedSecretHint = (TextView) findViewById(R.id.shared_secret_hint);
+		this.mManualVerificationArea = (LinearLayout) findViewById(R.id.manual_verification_area);
+		this.mSmpVerificationArea = (LinearLayout) findViewById(R.id.smp_verification_area);
 	}
 
 	private void showManuallyVerifyDialog() {
diff --git a/src/main/java/eu/siacs/conversations/utils/XmppUri.java b/src/main/java/eu/siacs/conversations/utils/XmppUri.java
index d7c3bce5..aacb6362 100644
--- a/src/main/java/eu/siacs/conversations/utils/XmppUri.java
+++ b/src/main/java/eu/siacs/conversations/utils/XmppUri.java
@@ -53,7 +53,7 @@ public class XmppUri {
 			final String NEEDLE = "otr-fingerprint=";
 			int index = query.indexOf(NEEDLE);
 			if (index >= 0 && query.length() >= (NEEDLE.length() + index + 40)) {
-				return CryptoHelper.prettifyFingerprint(query.substring(index + NEEDLE.length(), index + NEEDLE.length() + 40));
+				return query.substring(index + NEEDLE.length(), index + NEEDLE.length() + 40);
 			} else {
 				return null;
 			}
diff --git a/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
index 0d65e547..c9a478d4 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
@@ -576,8 +576,8 @@ public class XmppConnection implements Runnable {
 			auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
 			if (mechanisms.contains("SCRAM-SHA-1")) {
 				saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
-			} else if (mechanisms.contains("DIGEST-MD5")) {
-				saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
+			//} else if (mechanisms.contains("DIGEST-MD5")) {
+			//	saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 			} else if (mechanisms.contains("PLAIN")) {
 				saslMechanism = new Plain(tagWriter, account);
 			}
diff --git a/src/main/res/layout/activity_verify_otr.xml b/src/main/res/layout/activity_verify_otr.xml
index 73539e0e..28e5e5ed 100644
--- a/src/main/res/layout/activity_verify_otr.xml
+++ b/src/main/res/layout/activity_verify_otr.xml
@@ -1,189 +1,147 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
-            android:layout_width="fill_parent"
-            android:layout_height="fill_parent"
-            android:background="@color/secondarybackground">
-
-    <LinearLayout
-        android:layout_width="fill_parent"
-        android:layout_height="wrap_content"
-        android:orientation="vertical">
-        <TextView
-            android:id="@+id/error_no_session"
-            android:layout_margin="16dp"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="@string/no_otr_session_found"
-            android:layout_gravity="center_horizontal"
-            android:textColor="@color/primarytext"
-            android:textSize="?attr/TextSizeBody"
-            />
-        <RelativeLayout
-            android:id="@+id/verification_area_one"
-            android:layout_width="fill_parent"
-            android:layout_height="fill_parent"
-            android:background="@drawable/infocard_border"
-            android:layout_margin="8dp">
-        <LinearLayout
-            android:id="@+id/fingerprint_area"
-            android:layout_width="fill_parent"
-            android:layout_height="wrap_content"
-            android:padding="16dp"
-            android:orientation="vertical">
-            <TextView
-                android:id="@+id/remote_jid"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:textColor="@color/primarytext"
-                android:textSize="?attr/TextSizeHeadline"/>
-            <TextView
-                android:layout_marginTop="16dp"
-                android:id="@+id/your_fingerprint"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:textColor="@color/primarytext"
-                android:textSize="?attr/TextSizeBody"
-                android:typeface="monospace" />
-
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:textColor="@color/secondarytext"
-                android:textSize="?attr/TextSizeInfo"
-                android:text="@string/your_fingerprint"/>
-            <TextView
-                android:layout_marginTop="16dp"
-                android:id="@+id/remote_fingerprint"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:textColor="@color/primarytext"
-                android:textSize="?attr/TextSizeBody"
-                android:typeface="monospace" />
-
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:textColor="@color/secondarytext"
-                android:textSize="?attr/TextSizeInfo"
-                android:text="@string/remote_fingerprint"/>
-        </LinearLayout>
-            <LinearLayout
-                android:layout_below="@+id/fingerprint_area"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_alignParentBottom="true"
-                android:layout_alignParentLeft="true"
-                android:layout_alignParentRight="true" >
-
-                <Button
-                    android:id="@+id/button_show_qr_code"
-                    style="?android:attr/borderlessButtonStyle"
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:text="@string/show_qr_code"/>
-
-                <View
-                    android:layout_width="1dp"
-                    android:layout_height="fill_parent"
-                    android:layout_marginBottom="7dp"
-                    android:layout_marginTop="7dp"
-                    android:background="@color/divider" />
-
-                <Button
-                    android:id="@+id/button_scan_qr_code"
-                    style="?android:attr/borderlessButtonStyle"
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:text="@string/scan_qr_code"
-                    android:textColor="@color/primarytext" />
-            </LinearLayout>
-        </RelativeLayout>
-        <RelativeLayout
-            android:id="@+id/verification_area_two"
-            android:layout_width="fill_parent"
-            android:layout_height="wrap_content"
-            android:layout_margin="8dp"
-            android:background="@drawable/infocard_border">
-            <LinearLayout
-                android:layout_width="fill_parent"
-                android:layout_height="fill_parent"
-                android:orientation="vertical"
-                android:id="@+id/shared_secret_box"
-                android:padding="16dp">
-                <TextView
-                    android:text="@string/smp"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:textColor="@color/primarytext"
-                    android:textSize="?attr/TextSizeHeadline"
-                    android:layout_marginBottom="16dp"
-                    />
-                <TextView
-                    android:id="@+id/status_message"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="@string/verified"
-                    android:layout_gravity="center_horizontal"
-                    android:textSize="?attr/TextSizeHeadline"
-                    android:textStyle="bold"
-                    android:visibility="gone"/>
-                <EditText
-                    android:id="@+id/shared_secret_hint"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:inputType="textAutoComplete"
-                    android:hint="@string/shared_secret_hint"
-                    android:textColor="@color/primarytext"
-                    android:textColorHint="@color/secondarytext"
-                    android:textSize="?attr/TextSizeBody"
-                    android:layout_marginBottom="8dp"/>
-                <EditText
-                    android:id="@+id/shared_secret_secret"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="@string/shared_secret_secret"
-                    android:inputType="textPassword"
-                    android:textColor="@color/primarytext"
-                    android:textColorHint="@color/secondarytext"
-                    android:textSize="?attr/TextSizeBody" />
-            </LinearLayout>
-            <LinearLayout
-                android:layout_below="@+id/shared_secret_box"
-                android:id="@+id/button_bar"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_alignParentBottom="true"
-                android:layout_alignParentLeft="true"
-                android:layout_alignParentRight="true" >
-
-                <Button
-                    android:id="@+id/button_shared_secret_negative"
-                    style="?android:attr/borderlessButtonStyle"
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:enabled="false"
-                    android:text="@string/cancel"
-                    android:textColor="@color/secondarytext"/>
-
-                <View
-                    android:layout_width="1dp"
-                    android:layout_height="fill_parent"
-                    android:layout_marginBottom="7dp"
-                    android:layout_marginTop="7dp"
-                    android:background="@color/divider" />
-
-                <Button
-                    android:id="@+id/button_shared_secret_positive"
-                    style="?android:attr/borderlessButtonStyle"
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:text="@string/create"
-                    android:textColor="@color/primarytext" />
-            </LinearLayout>
-        </RelativeLayout>
-    </LinearLayout>
-</ScrollView>
\ No newline at end of file
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:background="@color/primarybackground">
+
+	<ScrollView
+		android:layout_width="fill_parent"
+		android:layout_height="fill_parent"
+		android:layout_above="@+id/button_bar">
+
+		<LinearLayout
+			android:layout_width="match_parent"
+			android:layout_height="match_parent"
+			android:orientation="vertical"
+			android:padding="16dp">
+
+			<TextView
+				android:id="@+id/verification_explanation"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"/>
+
+			<LinearLayout
+				android:id="@+id/manual_verification_area"
+				android:layout_width="fill_parent"
+				android:layout_height="wrap_content"
+				android:layout_marginTop="16dp"
+				android:orientation="vertical">
+
+				<TextView
+					android:id="@+id/your_fingerprint"
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:textColor="@color/primarytext"
+					android:textSize="?attr/TextSizeBody"
+					android:typeface="monospace"/>
+
+				<TextView
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:text="@string/your_fingerprint"
+					android:textColor="@color/secondarytext"
+					android:textSize="?attr/TextSizeInfo"/>
+
+				<TextView
+					android:id="@+id/remote_fingerprint"
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:layout_marginTop="20dp"
+					android:textColor="@color/primarytext"
+					android:textSize="?attr/TextSizeBody"
+					android:typeface="monospace"/>
+
+				<TextView
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:layout_marginBottom="20dp"
+					android:text="@string/remote_fingerprint"
+					android:textColor="@color/secondarytext"
+					android:textSize="?attr/TextSizeInfo"/>
+
+			</LinearLayout>
+
+			<LinearLayout
+				android:id="@+id/smp_verification_area"
+				android:layout_width="fill_parent"
+				android:layout_height="fill_parent"
+				android:layout_marginTop="16dp"
+				android:orientation="vertical">
+
+				<TextView
+					android:id="@+id/status_message"
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:layout_gravity="center_horizontal"
+					android:text="@string/verified"
+					android:textColor="@color/primarytext"
+					android:textSize="?attr/TextSizeHeadline"
+					android:textStyle="bold"
+					android:visibility="gone"/>
+
+				<TextView
+					android:id="@+id/shared_secret_hint"
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:layout_marginBottom="8dp"
+					android:textColor="@color/primarytext"
+					android:textSize="?attr/TextSizeBody"
+					android:textStyle="bold"
+					android:visibility="gone"/>
+
+				<EditText
+					android:id="@+id/shared_secret_hint_editable"
+					android:layout_width="match_parent"
+					android:layout_height="wrap_content"
+					android:layout_marginBottom="8dp"
+					android:hint="@string/shared_secret_hint"
+					android:inputType="textAutoComplete"
+					android:textColor="@color/primarytext"
+					android:textColorHint="@color/secondarytext"
+					android:textSize="?attr/TextSizeBody"/>
+
+				<EditText
+					android:id="@+id/shared_secret"
+					android:layout_width="match_parent"
+					android:layout_height="wrap_content"
+					android:layout_marginTop="8dp"
+					android:hint="@string/shared_secret_secret"
+					android:inputType="textPassword"
+					android:textColor="@color/primarytext"
+					android:textColorHint="@color/secondarytext"
+					android:textSize="?attr/TextSizeBody"/>
+			</LinearLayout>
+		</LinearLayout>
+	</ScrollView>
+
+	<LinearLayout
+		android:id="@+id/button_bar"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignParentBottom="true"
+		android:layout_alignParentLeft="true"
+		android:layout_alignParentRight="true">
+
+		<Button
+			android:id="@+id/left_button"
+			style="?android:attr/borderlessButtonStyle"
+			android:layout_width="0dp"
+			android:layout_height="wrap_content"
+			android:layout_weight="1"/>
+
+		<View
+			android:layout_width="1dp"
+			android:layout_height="fill_parent"
+			android:layout_marginBottom="7dp"
+			android:layout_marginTop="7dp"
+			android:background="@color/divider"/>
+
+		<Button
+			android:id="@+id/right_button"
+			style="?android:attr/borderlessButtonStyle"
+			android:layout_width="0dp"
+			android:layout_height="wrap_content"
+			android:layout_weight="1"/>
+	</LinearLayout>
+
+</RelativeLayout>
\ No newline at end of file
diff --git a/src/main/res/values/strings.xml b/src/main/res/values/strings.xml
index 34c574ee..be548ad4 100644
--- a/src/main/res/values/strings.xml
+++ b/src/main/res/values/strings.xml
@@ -392,4 +392,11 @@
     <string name="updating">Updating…</string>
     <string name="password_changed">Password changed!</string>
     <string name="could_not_change_password">Could not change password</string>
+    <string name="otr_session_not_started">Send a message to start an encrypted chat</string>
+    <string name="ask_question">Ask question</string>
+    <string name="smp_explain_question">If you and your contact have a secret in common that no one else knows (like an inside joke or simply what you had for lunch the last time you met) you can use that secret to verify each other\'s fingerprints.\n\nYou provide a hint or a question for your contact who will respond with a case-sensitive answer.</string>
+    <string name="smp_explain_answer">Your contact would like to verify your fingerprint by challenging you with a shared secret. Your contact provided the following hint or question for that secret.</string>
+    <string name="shared_secret_hint_should_not_be_empty">Your hint should not be empty</string>
+    <string name="shared_secret_can_not_be_empty">Your shared secret can not be empty</string>
+    <string name="manual_verification_explanation">Carefully compare the fingerprints shown below with the fingerprints of your contact.\nYou can use a trusted communication channel like an encrypted e-mail or a telephone call channel to exchange those.</string>
 </resources>