diff --git a/res/layout/activity_key_pair.xml b/res/layout/activity_key_pair.xml
index e6e9d1d2f9..ebcb2aedb6 100644
--- a/res/layout/activity_key_pair.xml
+++ b/res/layout/activity_key_pair.xml
@@ -51,7 +51,6 @@
             android:layout_width="match_parent"
             android:layout_height="50dp"
             android:layout_marginTop="20dp"
-            android:layout_gravity="center_horizontal"
             android:background="@color/white"
             android:textColor="@color/signal_primary"
             android:text="@string/activity_key_pair_copy_button_title"
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 5317bb89b4..74c6850295 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1534,9 +1534,11 @@
     <string name="activity_settings_show_seed_button_title">Show Seed</string>
     <string name="activity_settings_seed_dialog_title">Your Seed</string>
     <string name="activity_settings_seed_dialog_copy_button_title">Copy</string>
-    <string name="activity_settings_seed_dialog_cancel_button_title">Cancel</string>
+    <string name="activity_settings_seed_dialog_ok_button_title">OK</string>
     <string name="activity_settings_seed_copied_message">Copied to Clipboard</string>
     <!-- Contact selection activity -->
     <string name="activity_contact_selection_search_bar_placeholder">Search by name or public key</string>
+    <!-- New conversation activity -->
+    <string name="activity_new_conversation_invalid_public_key_message">Invalid Public Key</string>
 
 </resources>
diff --git a/src/org/thoughtcrime/securesms/ApplicationPreferencesActivity.java b/src/org/thoughtcrime/securesms/ApplicationPreferencesActivity.java
index 0fd9345bcd..ddd0871c2a 100644
--- a/src/org/thoughtcrime/securesms/ApplicationPreferencesActivity.java
+++ b/src/org/thoughtcrime/securesms/ApplicationPreferencesActivity.java
@@ -305,7 +305,7 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
                     clipboard.setPrimaryClip(clip);
                     Toast.makeText(getContext(), R.string.activity_settings_seed_copied_message, Toast.LENGTH_SHORT).show();
                   })
-                  .setNeutralButton(R.string.activity_settings_seed_dialog_cancel_button_title, null)
+                  .setNeutralButton(R.string.activity_settings_seed_dialog_ok_button_title, null)
                   .show();
           break;
         default:
diff --git a/src/org/thoughtcrime/securesms/NewConversationActivity.java b/src/org/thoughtcrime/securesms/NewConversationActivity.java
index 4f44d3a73b..abe1e811a5 100644
--- a/src/org/thoughtcrime/securesms/NewConversationActivity.java
+++ b/src/org/thoughtcrime/securesms/NewConversationActivity.java
@@ -19,12 +19,14 @@ package org.thoughtcrime.securesms;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.MenuItem;
+import android.widget.Toast;
 
 import org.thoughtcrime.securesms.conversation.ConversationActivity;
 import org.thoughtcrime.securesms.database.Address;
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.ThreadDatabase;
 import org.thoughtcrime.securesms.recipients.Recipient;
+import org.whispersystems.signalservice.loki.utilities.PublicKeyValidation;
 
 /**
  * Activity container for starting a new conversation.
@@ -46,7 +48,14 @@ public class NewConversationActivity extends ContactSelectionActivity {
 
   @Override
   public void onContactSelected(String number) {
-    Recipient recipient = Recipient.from(this, Address.fromExternal(this, number), true);
+    boolean isValid = PublicKeyValidation.isValid(number);
+
+    if (!isValid) {
+      Toast.makeText(this, R.string.activity_new_conversation_invalid_public_key_message, Toast.LENGTH_SHORT).show();
+      return;
+    }
+
+    Recipient recipient = Recipient.from(this, Address.fromSerialized(number), true);
 
     Intent intent = new Intent(this, ConversationActivity.class);
     intent.putExtra(ConversationActivity.ADDRESS_EXTRA, recipient.getAddress());