diff --git a/OpenPGP-Keychain/src/main/AndroidManifest.xml b/OpenPGP-Keychain/src/main/AndroidManifest.xml
index 3ef04e4f6..4102a882e 100644
--- a/OpenPGP-Keychain/src/main/AndroidManifest.xml
+++ b/OpenPGP-Keychain/src/main/AndroidManifest.xml
@@ -249,9 +249,9 @@
             android:label="@string/title_key_server_preference"
             android:windowSoftInputMode="stateHidden" />
         <activity
-            android:name=".ui.SignKeyActivity"
+            android:name=".ui.CertifyKeyActivity"
             android:configChanges="orientation|screenSize|keyboardHidden|keyboard"
-            android:label="@string/title_sign_key" />
+            android:label="@string/title_certify_key" />
         <activity
             android:name=".ui.ImportKeysActivity"
             android:label="@string/title_import_keys"
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
index 9782d1ac2..7caee4048 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
@@ -405,7 +405,7 @@ public class PgpKeyOperation {
         updateProgress(R.string.progress_done, 100, 100);
     }
 
-    public PGPPublicKeyRing signKey(long masterKeyId, long pubKeyId, String passphrase)
+    public PGPPublicKeyRing certifyKey(long masterKeyId, long pubKeyId, String passphrase)
             throws PgpGeneralException, NoSuchAlgorithmException, NoSuchProviderException,
             PGPException, SignatureException {
         if (passphrase == null) {
@@ -414,14 +414,14 @@ public class PgpKeyOperation {
             PGPPublicKeyRing pubring = ProviderHelper
                     .getPGPPublicKeyRingByKeyId(mContext, pubKeyId);
 
-            PGPSecretKey signingKey = PgpKeyHelper.getCertificationKey(mContext, masterKeyId);
-            if (signingKey == null) {
+            PGPSecretKey certificationKey = PgpKeyHelper.getCertificationKey(mContext, masterKeyId);
+            if (certificationKey == null) {
                 throw new PgpGeneralException(mContext.getString(R.string.error_signature_failed));
             }
 
             PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
                     Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(passphrase.toCharArray());
-            PGPPrivateKey signaturePrivateKey = signingKey.extractPrivateKey(keyDecryptor);
+            PGPPrivateKey signaturePrivateKey = certificationKey.extractPrivateKey(keyDecryptor);
             if (signaturePrivateKey == null) {
                 throw new PgpGeneralException(
                         mContext.getString(R.string.error_could_not_extract_private_key));
@@ -429,7 +429,7 @@ public class PgpKeyOperation {
 
             // TODO: SHA256 fixed?
             JcaPGPContentSignerBuilder contentSignerBuilder = new JcaPGPContentSignerBuilder(
-                    signingKey.getPublicKey().getAlgorithm(), PGPUtil.SHA256)
+                    certificationKey.getPublicKey().getAlgorithm(), PGPUtil.SHA256)
                     .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
 
             PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java
index 657d40a5a..ddb53736a 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java
@@ -54,7 +54,6 @@ import org.sufficientlysecure.keychain.ui.adapter.ImportKeysListEntry;
 import org.sufficientlysecure.keychain.util.HkpKeyServer;
 import org.sufficientlysecure.keychain.util.InputData;
 import org.sufficientlysecure.keychain.util.Log;
-import org.sufficientlysecure.keychain.util.PositionAwareInputStream;
 import org.sufficientlysecure.keychain.util.ProgressDialogUpdater;
 
 import android.app.IntentService;
@@ -96,7 +95,7 @@ public class KeychainIntentService extends IntentService implements ProgressDial
     public static final String ACTION_UPLOAD_KEYRING = Constants.INTENT_PREFIX + "UPLOAD_KEYRING";
     public static final String ACTION_DOWNLOAD_AND_IMPORT_KEYS = Constants.INTENT_PREFIX + "QUERY_KEYRING";
 
-    public static final String ACTION_SIGN_KEYRING = Constants.INTENT_PREFIX + "SIGN_KEYRING";
+    public static final String ACTION_CERTIFY_KEYRING = Constants.INTENT_PREFIX + "SIGN_KEYRING";
 
     /* keys for data bundle */
 
@@ -163,8 +162,8 @@ public class KeychainIntentService extends IntentService implements ProgressDial
     public static final String DOWNLOAD_KEY_LIST = "query_key_id";
 
     // sign key
-    public static final String SIGN_KEY_MASTER_KEY_ID = "sign_key_master_key_id";
-    public static final String SIGN_KEY_PUB_KEY_ID = "sign_key_pub_key_id";
+    public static final String CERTIFY_KEY_MASTER_KEY_ID = "sign_key_master_key_id";
+    public static final String CERTIFY_KEY_PUB_KEY_ID = "sign_key_pub_key_id";
 
     /*
      * possible data keys as result send over messenger
@@ -777,19 +776,19 @@ public class KeychainIntentService extends IntentService implements ProgressDial
             } catch (Exception e) {
                 sendErrorToHandler(e);
             }
-        } else if (ACTION_SIGN_KEYRING.equals(action)) {
+        } else if (ACTION_CERTIFY_KEYRING.equals(action)) {
             try {
 
                 /* Input */
-                long masterKeyId = data.getLong(SIGN_KEY_MASTER_KEY_ID);
-                long pubKeyId = data.getLong(SIGN_KEY_PUB_KEY_ID);
+                long masterKeyId = data.getLong(CERTIFY_KEY_MASTER_KEY_ID);
+                long pubKeyId = data.getLong(CERTIFY_KEY_PUB_KEY_ID);
 
                 /* Operation */
                 String signaturePassPhrase = PassphraseCacheService.getCachedPassphrase(this,
                         masterKeyId);
 
                 PgpKeyOperation keyOperation = new PgpKeyOperation(this, this);
-                PGPPublicKeyRing signedPubKeyRing = keyOperation.signKey(masterKeyId, pubKeyId,
+                PGPPublicKeyRing signedPubKeyRing = keyOperation.certifyKey(masterKeyId, pubKeyId,
                         signaturePassPhrase);
 
                 // store the signed key in our local cache
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/SignKeyActivity.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/CertifyKeyActivity.java
similarity index 93%
rename from OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/SignKeyActivity.java
rename to OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/CertifyKeyActivity.java
index d9fb294d5..c60b1c2ed 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/SignKeyActivity.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/CertifyKeyActivity.java
@@ -56,7 +56,7 @@ import com.beardedhen.androidbootstrap.BootstrapButton;
 /**
  * Signs the specified public key with the specified secret master key
  */
-public class SignKeyActivity extends ActionBarActivity implements
+public class CertifyKeyActivity extends ActionBarActivity implements
         SelectSecretKeyLayoutFragment.SelectSecretKeyCallback {
     private BootstrapButton mSignButton;
     private CheckBox mUploadKeyCheckbox;
@@ -72,7 +72,7 @@ public class SignKeyActivity extends ActionBarActivity implements
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        setContentView(R.layout.sign_key_activity);
+        setContentView(R.layout.certify_key_activity);
 
         final ActionBar actionBar = getSupportActionBar();
         actionBar.setDisplayShowTitleEnabled(true);
@@ -196,8 +196,8 @@ public class SignKeyActivity extends ActionBarActivity implements
                 String passphrase = PassphraseCacheService.getCachedPassphrase(this, mMasterKeyId);
                 if (passphrase == null) {
                     showPassphraseDialog(mMasterKeyId);
-                    return; // bail out; need to wait until the user has entered the passphrase
-                            // before trying again
+                    // bail out; need to wait until the user has entered the passphrase before trying again
+                    return;
                 } else {
                     startSigning();
                 }
@@ -218,13 +218,13 @@ public class SignKeyActivity extends ActionBarActivity implements
         // Send all information needed to service to sign key in other thread
         Intent intent = new Intent(this, KeychainIntentService.class);
 
-        intent.setAction(KeychainIntentService.ACTION_SIGN_KEYRING);
+        intent.setAction(KeychainIntentService.ACTION_CERTIFY_KEYRING);
 
         // fill values for this action
         Bundle data = new Bundle();
 
-        data.putLong(KeychainIntentService.SIGN_KEY_MASTER_KEY_ID, mMasterKeyId);
-        data.putLong(KeychainIntentService.SIGN_KEY_PUB_KEY_ID, mPubKeyId);
+        data.putLong(KeychainIntentService.CERTIFY_KEY_MASTER_KEY_ID, mMasterKeyId);
+        data.putLong(KeychainIntentService.CERTIFY_KEY_PUB_KEY_ID, mPubKeyId);
 
         intent.putExtra(KeychainIntentService.EXTRA_DATA, data);
 
@@ -237,14 +237,12 @@ public class SignKeyActivity extends ActionBarActivity implements
 
                 if (message.arg1 == KeychainIntentServiceHandler.MESSAGE_OKAY) {
 
-                    Toast.makeText(SignKeyActivity.this, R.string.key_sign_success,
+                    Toast.makeText(CertifyKeyActivity.this, R.string.key_sign_success,
                             Toast.LENGTH_SHORT).show();
 
                     // check if we need to send the key to the server or not
                     if (mUploadKeyCheckbox.isChecked()) {
-                        /*
-                         * upload the newly signed key to the key server
-                         */
+                        // upload the newly signed key to the key server
                         uploadKey();
                     } else {
                         setResult(RESULT_OK);
@@ -291,7 +289,7 @@ public class SignKeyActivity extends ActionBarActivity implements
                 super.handleMessage(message);
 
                 if (message.arg1 == KeychainIntentServiceHandler.MESSAGE_OKAY) {
-                    Toast.makeText(SignKeyActivity.this, R.string.key_send_success,
+                    Toast.makeText(CertifyKeyActivity.this, R.string.key_send_success,
                             Toast.LENGTH_SHORT).show();
 
                     setResult(RESULT_OK);
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysActivity.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysActivity.java
index dc3a07def..70f3c955a 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysActivity.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysActivity.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
  * Copyright (C) 2011 Senecaso
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -127,7 +127,7 @@ public class ImportKeysActivity extends DrawerActivity implements ActionBar.OnNa
             /* Scanning a fingerprint directly with Barcode Scanner */
             getSupportActionBar().setSelectedNavigationItem(0);
             loadFragment(ImportKeysQrCodeFragment.class, null, mNavigationStrings[0]);
-            loadFromFingerprintUri(dataUri);
+            loadFromFingerprintUri(savedInstanceState, dataUri);
         } else if (ACTION_IMPORT_KEY.equals(action)) {
             /* Keychain's own Actions */
             getSupportActionBar().setSelectedNavigationItem(1);
@@ -248,7 +248,7 @@ public class ImportKeysActivity extends DrawerActivity implements ActionBar.OnNa
         ft.commit();
     }
 
-    public void loadFromFingerprintUri(Uri dataUri) {
+    public void loadFromFingerprintUri(Bundle savedInstanceState, Uri dataUri) {
         String fingerprint = dataUri.toString().split(":")[1].toLowerCase(Locale.ENGLISH);
 
         Log.d(Constants.TAG, "fingerprint: " + fingerprint);
@@ -267,7 +267,7 @@ public class ImportKeysActivity extends DrawerActivity implements ActionBar.OnNa
         args.putString(ImportKeysServerFragment.ARG_QUERY, query);
         loadFragment(ImportKeysServerFragment.class, args, mNavigationStrings[0]);
 
-        startListFragment(null, null, null, query);
+        startListFragment(savedInstanceState, null, null, query);
     }
 
     public void loadCallback(byte[] importData, Uri dataUri, String serverQuery, String keyServer) {
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysQrCodeFragment.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysQrCodeFragment.java
index 63727ad26..27628dad4 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysQrCodeFragment.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysQrCodeFragment.java
@@ -130,7 +130,7 @@ public class ImportKeysQrCodeFragment extends Fragment {
     }
 
     public void importFingerprint(Uri dataUri) {
-        mImportActivity.loadFromFingerprintUri(dataUri);
+        mImportActivity.loadFromFingerprintUri(null, dataUri);
     }
 
     private void importParts(String[] parts) {
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java
index 99d93fbbd..0bfc51e67 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java
@@ -75,6 +75,7 @@ public class ViewKeyActivity extends ActionBarActivity implements
     private TextView mCreation;
     private TextView mFingerprint;
     private BootstrapButton mActionEncrypt;
+    private BootstrapButton mActionCertify;
 
     private ListView mUserIds;
     private ListView mKeys;
@@ -91,6 +92,7 @@ public class ViewKeyActivity extends ActionBarActivity implements
 
         mExportHelper = new ExportHelper(this);
 
+        // let the actionbar look like Android's contact app
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
         getSupportActionBar().setIcon(android.R.color.transparent);
         getSupportActionBar().setHomeButtonEnabled(true);
@@ -105,9 +107,10 @@ public class ViewKeyActivity extends ActionBarActivity implements
         mCreation = (TextView) findViewById(R.id.creation);
         mExpiry = (TextView) findViewById(R.id.expiry);
         mFingerprint = (TextView) findViewById(R.id.fingerprint);
-        mActionEncrypt = (BootstrapButton) findViewById(R.id.action_encrypt);
         mUserIds = (ListView) findViewById(R.id.user_ids);
         mKeys = (ListView) findViewById(R.id.keys);
+        mActionEncrypt = (BootstrapButton) findViewById(R.id.action_encrypt);
+        mActionCertify = (BootstrapButton) findViewById(R.id.action_certify);
 
         loadData(getIntent());
     }
@@ -130,9 +133,6 @@ public class ViewKeyActivity extends ActionBarActivity implements
             case R.id.menu_key_view_update:
                 updateFromKeyserver(mDataUri);
                 return true;
-            case R.id.menu_key_view_sign:
-                signKey(mDataUri);
-                return true;
             case R.id.menu_key_view_export_keyserver:
                 uploadToKeyserver(mDataUri);
                 return true;
@@ -196,19 +196,18 @@ public class ViewKeyActivity extends ActionBarActivity implements
 
             @Override
             public void onClick(View v) {
-                long keyId = ProviderHelper.getMasterKeyId(ViewKeyActivity.this, mDataUri);
+                encryptToContact(mDataUri);
+            }
+        });
+        mActionCertify.setOnClickListener(new OnClickListener() {
 
-                long[] encryptionKeyIds = new long[]{keyId};
-                Intent intent = new Intent(ViewKeyActivity.this, EncryptActivity.class);
-                intent.setAction(EncryptActivity.ACTION_ENCRYPT);
-                intent.putExtra(EncryptActivity.EXTRA_ENCRYPTION_KEY_IDS, encryptionKeyIds);
-                // used instead of startActivity set actionbar based on callingPackage
-                startActivityForResult(intent, 0);
+            @Override
+            public void onClick(View v) {
+                certifyKey(mDataUri);
             }
         });
 
         mUserIdsAdapter = new ViewKeyUserIdsAdapter(this, null, 0);
-
         mUserIds.setAdapter(mUserIdsAdapter);
         // mUserIds.setEmptyView(findViewById(android.R.id.empty));
         // mUserIds.setClickable(true);
@@ -219,11 +218,10 @@ public class ViewKeyActivity extends ActionBarActivity implements
         // });
 
         mKeysAdapter = new ViewKeyKeysAdapter(this, null, 0);
-
         mKeys.setAdapter(mKeysAdapter);
 
-        // Prepare the loader. Either re-connect with an existing one,
-        // or start a new one.
+        // Prepare the loaders. Either re-connect with an existing ones,
+        // or start new ones.
         getSupportLoaderManager().initLoader(LOADER_ID_KEYRING, null, this);
         getSupportLoaderManager().initLoader(LOADER_ID_USER_IDS, null, this);
         getSupportLoaderManager().initLoader(LOADER_ID_KEYS, null, this);
@@ -405,8 +403,19 @@ public class ViewKeyActivity extends ActionBarActivity implements
         startActivityForResult(queryIntent, Id.request.look_up_key_id);
     }
 
-    private void signKey(Uri dataUri) {
-        Intent signIntent = new Intent(this, SignKeyActivity.class);
+    private void encryptToContact(Uri dataUri) {
+        long keyId = ProviderHelper.getMasterKeyId(ViewKeyActivity.this, dataUri);
+
+        long[] encryptionKeyIds = new long[]{keyId};
+        Intent intent = new Intent(ViewKeyActivity.this, EncryptActivity.class);
+        intent.setAction(EncryptActivity.ACTION_ENCRYPT);
+        intent.putExtra(EncryptActivity.EXTRA_ENCRYPTION_KEY_IDS, encryptionKeyIds);
+        // used instead of startActivity set actionbar based on callingPackage
+        startActivityForResult(intent, 0);
+    }
+
+    private void certifyKey(Uri dataUri) {
+        Intent signIntent = new Intent(this, CertifyKeyActivity.class);
         signIntent.setData(dataUri);
         startActivity(signIntent);
     }
diff --git a/OpenPGP-Keychain/src/main/res/layout/sign_key_activity.xml b/OpenPGP-Keychain/src/main/res/layout/certify_key_activity.xml
similarity index 98%
rename from OpenPGP-Keychain/src/main/res/layout/sign_key_activity.xml
rename to OpenPGP-Keychain/src/main/res/layout/certify_key_activity.xml
index 07f63b91b..1dbd2476c 100644
--- a/OpenPGP-Keychain/src/main/res/layout/sign_key_activity.xml
+++ b/OpenPGP-Keychain/src/main/res/layout/certify_key_activity.xml
@@ -60,7 +60,7 @@
             android:layout_height="60dp"
             android:layout_marginBottom="4dp"
             android:layout_marginTop="14dp"
-            android:text="@string/btn_sign"
+            android:text="@string/btn_certify"
             bootstrapbutton:bb_icon_left="fa-pencil"
             bootstrapbutton:bb_type="info" />
     </LinearLayout>
diff --git a/OpenPGP-Keychain/src/main/res/layout/view_key_activity.xml b/OpenPGP-Keychain/src/main/res/layout/view_key_activity.xml
index 73a86a725..1c937430a 100644
--- a/OpenPGP-Keychain/src/main/res/layout/view_key_activity.xml
+++ b/OpenPGP-Keychain/src/main/res/layout/view_key_activity.xml
@@ -215,6 +215,15 @@
             android:text="@string/key_view_action_encrypt"
             bootstrapbutton:bb_icon_left="fa-lock"
             bootstrapbutton:bb_type="info" />
+
+        <com.beardedhen.androidbootstrap.BootstrapButton
+            android:id="@+id/action_certify"
+            android:layout_width="match_parent"
+            android:layout_height="60dp"
+            android:padding="4dp"
+            android:text="@string/key_view_action_certify"
+            bootstrapbutton:bb_icon_left="fa-pencil"
+            bootstrapbutton:bb_type="info" />
     </LinearLayout>
 
 </ScrollView>
\ No newline at end of file
diff --git a/OpenPGP-Keychain/src/main/res/menu/key_view.xml b/OpenPGP-Keychain/src/main/res/menu/key_view.xml
index acf3eb099..59247221a 100644
--- a/OpenPGP-Keychain/src/main/res/menu/key_view.xml
+++ b/OpenPGP-Keychain/src/main/res/menu/key_view.xml
@@ -64,10 +64,6 @@
                 android:title="@string/menu_export_key_to_server" />
         </menu>
     </item>
-    <item
-        android:id="@+id/menu_key_view_sign"
-        app:showAsAction="ifRoom"
-        android:title="@string/menu_sign_key" />
     <item
         android:id="@+id/menu_key_view_export_file"
         app:showAsAction="never"
diff --git a/OpenPGP-Keychain/src/main/res/values-de/strings.xml b/OpenPGP-Keychain/src/main/res/values-de/strings.xml
index ebf303f8a..0758e9cde 100644
--- a/OpenPGP-Keychain/src/main/res/values-de/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-de/strings.xml
@@ -25,7 +25,7 @@
   <string name="title_key_server_query">Schlüssel-Server abfragen</string>
   <string name="title_send_key">Auf Schlüsselserver hochladen</string>
   <string name="title_unknown_signature_key">Unbekannter Signaturschlüssel</string>
-  <string name="title_sign_key">Schlüssel signieren</string>
+  <string name="title_certify_key">Schlüssel signieren</string>
   <string name="title_key_details">Schlüsseldetails</string>
   <string name="title_help">Hilfe</string>
   <!--section-->
diff --git a/OpenPGP-Keychain/src/main/res/values-es-rCO/strings.xml b/OpenPGP-Keychain/src/main/res/values-es-rCO/strings.xml
index 8f508a885..6c520988f 100644
--- a/OpenPGP-Keychain/src/main/res/values-es-rCO/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-es-rCO/strings.xml
@@ -22,7 +22,7 @@
   <string name="title_key_not_found">Clave no encontrada</string>
   <string name="title_key_server_query">Solicitar al servidor de claves</string>
   <string name="title_unknown_signature_key">Clave de firma desconocida</string>
-  <string name="title_sign_key">Clave de firma</string>
+  <string name="title_certify_key">Clave de firma</string>
   <string name="title_help">Ayuda</string>
   <!--section-->
   <string name="section_user_ids">IDs de usuario</string>
diff --git a/OpenPGP-Keychain/src/main/res/values-fr/strings.xml b/OpenPGP-Keychain/src/main/res/values-fr/strings.xml
index d427403dd..5f12275b9 100644
--- a/OpenPGP-Keychain/src/main/res/values-fr/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-fr/strings.xml
@@ -25,7 +25,7 @@
   <string name="title_key_server_query">Interroger le serveur de clefs</string>
   <string name="title_send_key">Téléverser vers le serveur de clefs</string>
   <string name="title_unknown_signature_key">Clef de signature inconnue</string>
-  <string name="title_sign_key">Signer la clef</string>
+  <string name="title_certify_key">Signer la clef</string>
   <string name="title_key_details">Détails sur la clef</string>
   <string name="title_help">Aide</string>
   <!--section-->
diff --git a/OpenPGP-Keychain/src/main/res/values-it-rIT/strings.xml b/OpenPGP-Keychain/src/main/res/values-it-rIT/strings.xml
index 44424561b..71783d3b2 100644
--- a/OpenPGP-Keychain/src/main/res/values-it-rIT/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-it-rIT/strings.xml
@@ -15,7 +15,7 @@
   <string name="title_export_key">Esportare Chiave</string>
   <string name="title_export_keys">Esportare Chiavi</string>
   <string name="title_key_not_found">Chiave Non Trovata</string>
-  <string name="title_sign_key">Firma Chiave</string>
+  <string name="title_certify_key">Firma Chiave</string>
   <string name="title_help">Aiuto</string>
   <!--section-->
   <string name="section_user_ids">ID Utente</string>
diff --git a/OpenPGP-Keychain/src/main/res/values-nl-rNL/strings.xml b/OpenPGP-Keychain/src/main/res/values-nl-rNL/strings.xml
index b0d792708..7389664fe 100644
--- a/OpenPGP-Keychain/src/main/res/values-nl-rNL/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-nl-rNL/strings.xml
@@ -22,7 +22,7 @@
   <string name="title_key_not_found">Sleutel niet gevonden</string>
   <string name="title_key_server_query">Sleutelserver verzoek zenden</string>
   <string name="title_unknown_signature_key">Onbekende handtekeningssleutel</string>
-  <string name="title_sign_key">Sleutel ondertekenen</string>
+  <string name="title_certify_key">Sleutel ondertekenen</string>
   <string name="title_help">Help</string>
   <!--section-->
   <string name="section_user_ids">Gebruikers-id\'s</string>
diff --git a/OpenPGP-Keychain/src/main/res/values-ru/strings.xml b/OpenPGP-Keychain/src/main/res/values-ru/strings.xml
index 91ec2d1af..dd9eaf86d 100644
--- a/OpenPGP-Keychain/src/main/res/values-ru/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-ru/strings.xml
@@ -25,7 +25,7 @@
   <string name="title_key_server_query">Запросить сервер ключей</string>
   <string name="title_send_key">Загрузить на сервер ключей</string>
   <string name="title_unknown_signature_key">Неизвестная подпись</string>
-  <string name="title_sign_key">Ключ для подписи</string>
+  <string name="title_certify_key">Ключ для подписи</string>
   <string name="title_key_details">Сведения о ключе</string>
   <string name="title_help">Помощь</string>
   <!--section-->
diff --git a/OpenPGP-Keychain/src/main/res/values-tr/strings.xml b/OpenPGP-Keychain/src/main/res/values-tr/strings.xml
index d9fe8713e..20d99ae2e 100644
--- a/OpenPGP-Keychain/src/main/res/values-tr/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-tr/strings.xml
@@ -14,7 +14,7 @@
   <string name="title_key_not_found">Anahtar Bulunamadı</string>
   <string name="title_key_server_query">Anahtar Sunucusunu Sorgula</string>
   <string name="title_unknown_signature_key">Bilinmeyen İmza Anahtarı</string>
-  <string name="title_sign_key">Anahtarı İmzala</string>
+  <string name="title_certify_key">Anahtarı İmzala</string>
   <string name="title_key_details">Anahtar Detayları</string>
   <string name="title_help">Yardım</string>
   <!--section-->
diff --git a/OpenPGP-Keychain/src/main/res/values-uk/strings.xml b/OpenPGP-Keychain/src/main/res/values-uk/strings.xml
index ac40311b0..b08c8edc2 100644
--- a/OpenPGP-Keychain/src/main/res/values-uk/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values-uk/strings.xml
@@ -25,7 +25,7 @@
   <string name="title_key_server_query">Сервер запиту ключа</string>
   <string name="title_send_key">Завантажити на сервер ключів</string>
   <string name="title_unknown_signature_key">Невідомий підпис ключа</string>
-  <string name="title_sign_key">Підписати ключ</string>
+  <string name="title_certify_key">Підписати ключ</string>
   <string name="title_key_details">Подробиці про ключ</string>
   <string name="title_help">Довідка</string>
   <!--section-->
diff --git a/OpenPGP-Keychain/src/main/res/values/strings.xml b/OpenPGP-Keychain/src/main/res/values/strings.xml
index fb7b60b7c..0d8870a3e 100644
--- a/OpenPGP-Keychain/src/main/res/values/strings.xml
+++ b/OpenPGP-Keychain/src/main/res/values/strings.xml
@@ -26,7 +26,7 @@
     <string name="title_key_server_query">Query Key Server</string>
     <string name="title_send_key">Upload to Key Server</string>
     <string name="title_unknown_signature_key">Unknown Signature Key</string>
-    <string name="title_sign_key">Sign Key</string>
+    <string name="title_certify_key">Certify Key</string>
     <string name="title_key_details">Key Details</string>
     <string name="title_help">Help</string>
 
@@ -39,7 +39,7 @@
     <string name="section_master_key">Master Key</string>
     <string name="section_master_user_id">Master User ID</string>
     <string name="section_actions">Actions</string>
-    <string name="section_signing_key">Your Key used for Signing</string>
+    <string name="section_certification_key">Your Key used for certification</string>
     <string name="section_upload_key">Upload Key</string>
     <string name="section_key_server">Key Server</string>
     <string name="section_encrypt_and_or_sign">Encrypt and/or Sign</string>
@@ -47,6 +47,7 @@
 
     <!-- button -->
     <string name="btn_sign">Sign</string>
+    <string name="btn_certify">Certify</string>
     <string name="btn_decrypt">Decrypt</string>
     <string name="btn_decrypt_verify">Decrypt and Verify</string>
     <string name="btn_select_encrypt_keys">Select Recipients</string>
@@ -126,7 +127,7 @@
     <string name="label_name">Name</string>
     <string name="label_comment">Comment</string>
     <string name="label_email">Email</string>
-    <string name="label_send_key">Upload key to selected key server after signing</string>
+    <string name="label_send_key">Upload key to selected key server after certification</string>
     <string name="label_fingerprint">Fingerprint</string>
     <string name="select_keys_button_default">Select</string>
 
@@ -406,6 +407,7 @@
 
     <!-- Key view -->
     <string name="key_view_action_encrypt">Encrypt to this contact</string>
+    <string name="key_view_action_certify">Certify User ID of this contact</string>
 
     <!-- Navigation Drawer -->
     <string name="nav_contacts">Contacts</string>