diff --git a/TMessagesProj/src/main/AndroidManifest.xml b/TMessagesProj/src/main/AndroidManifest.xml
index 4f15baba5..af71a62b1 100644
--- a/TMessagesProj/src/main/AndroidManifest.xml
+++ b/TMessagesProj/src/main/AndroidManifest.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.telegram.messenger"
-    android:versionCode="122"
-    android:versionName="1.3.2">
+    android:versionCode="126"
+    android:versionName="1.3.4">
     
     <supports-screens android:anyDensity="true"
     android:smallScreens="true"
diff --git a/TMessagesProj/src/main/java/org/telegram/messenger/ExportAuthorizationAction.java b/TMessagesProj/src/main/java/org/telegram/messenger/ExportAuthorizationAction.java
index 011718247..355dd8512 100644
--- a/TMessagesProj/src/main/java/org/telegram/messenger/ExportAuthorizationAction.java
+++ b/TMessagesProj/src/main/java/org/telegram/messenger/ExportAuthorizationAction.java
@@ -37,6 +37,9 @@ public class ExportAuthorizationAction extends Action {
         ConnectionsManager.Instance.performRpc(exportAuthorization, new RPCRequest.RPCRequestDelegate() {
             @Override
             public void run(TLObject response, TLRPC.TL_error error) {
+                if (delegate == null) {
+                    return;
+                }
                 if (error == null) {
                     exportedAuthorization = (TLRPC.TL_auth_exportedAuthorization)response;
                     beginImport();
@@ -65,6 +68,9 @@ public class ExportAuthorizationAction extends Action {
         ConnectionsManager.Instance.performRpc(importAuthorization, new RPCRequest.RPCRequestDelegate() {
             @Override
             public void run(TLObject response, TLRPC.TL_error error) {
+                if (delegate == null) {
+                    return;
+                }
                 if (error == null) {
                     delegate.ActionDidFinishExecution(ExportAuthorizationAction.this, null);
                 } else {
diff --git a/TMessagesProj/src/main/java/org/telegram/messenger/HandshakeAction.java b/TMessagesProj/src/main/java/org/telegram/messenger/HandshakeAction.java
index f3bd83438..4303e7ca1 100644
--- a/TMessagesProj/src/main/java/org/telegram/messenger/HandshakeAction.java
+++ b/TMessagesProj/src/main/java/org/telegram/messenger/HandshakeAction.java
@@ -178,6 +178,7 @@ public class HandshakeAction extends Action implements TcpConnection.TcpConnecti
                 Utilities.globalQueue.postRunnable(new Runnable() {
                     @Override
                     public void run() {
+
                         final Utilities.TPFactorizedValue factorizedPq = Utilities.getFactorizedValue(pqf);
 
                         Utilities.stageQueue.postRunnable(new Runnable() {
@@ -323,6 +324,10 @@ public class HandshakeAction extends Action implements TcpConnection.TcpConnecti
                     return;
                 }
 
+                if (!Utilities.isGoodPrime(dhInnerData.dh_prime)) {
+                    throw new RuntimeException("bad prime");
+                }
+
                 if (!Arrays.equals(authNonce, dhInnerData.nonce)) {
                     FileLog.e("tmessages", "***** Invalid DH nonce");
                     beginHandshake(false);
@@ -339,12 +344,13 @@ public class HandshakeAction extends Action implements TcpConnection.TcpConnecti
                     b[a] = (byte)(MessagesController.random.nextDouble() * 255);
                 }
 
+                BigInteger dhBI = new BigInteger(1, dhInnerData.dh_prime);
                 BigInteger i_g_b = BigInteger.valueOf(dhInnerData.g);
-                i_g_b = i_g_b.modPow(new BigInteger(1, b), new BigInteger(1, dhInnerData.dh_prime));
+                i_g_b = i_g_b.modPow(new BigInteger(1, b), dhBI);
                 byte[] g_b = i_g_b.toByteArray();
 
                 BigInteger i_authKey = new BigInteger(1, dhInnerData.g_a);
-                i_authKey = i_authKey.modPow(new BigInteger(1, b), new BigInteger(1, dhInnerData.dh_prime));
+                i_authKey = i_authKey.modPow(new BigInteger(1, b), dhBI);
 
                 authKey = i_authKey.toByteArray();
                 if (authKey.length > 256) {
diff --git a/TMessagesProj/src/main/java/org/telegram/messenger/MessagesController.java b/TMessagesProj/src/main/java/org/telegram/messenger/MessagesController.java
index a82c030f0..62ae0bae0 100644
--- a/TMessagesProj/src/main/java/org/telegram/messenger/MessagesController.java
+++ b/TMessagesProj/src/main/java/org/telegram/messenger/MessagesController.java
@@ -1224,6 +1224,9 @@ public class MessagesController implements NotificationCenter.NotificationCenter
 
                 for (TLRPC.TL_contact value : contactsArr) {
                     TLRPC.User user = usersDict.get(value.user_id);
+                    if (user == null) {
+                        continue;
+                    }
                     contactsDictionery.put(value.user_id, value);
                     contactsPhones.put(user.phone, value);
 
@@ -4880,6 +4883,12 @@ public class MessagesController implements NotificationCenter.NotificationCenter
                 if (error == null) {
                     TLRPC.messages_DhConfig res = (TLRPC.messages_DhConfig)response;
                     if (response instanceof TLRPC.TL_messages_dhConfig) {
+                        if (!Utilities.isGoodPrime(res.p)) {
+                            acceptingChats.remove(encryptedChat.id);
+                            declineSecretChat(encryptedChat.id);
+                            return;
+                        }
+
                         MessagesStorage.secretPBytes = res.p;
                         MessagesStorage.secretG = res.g;
                         MessagesStorage.lastSecretVersion = res.version;
@@ -4967,6 +4976,17 @@ public class MessagesController implements NotificationCenter.NotificationCenter
                 if (error == null) {
                     TLRPC.messages_DhConfig res = (TLRPC.messages_DhConfig)response;
                     if (response instanceof TLRPC.TL_messages_dhConfig) {
+                        if (!Utilities.isGoodPrime(res.p)) {
+                            Utilities.RunOnUIThread(new Runnable() {
+                                @Override
+                                public void run() {
+                                    if (!((ActionBarActivity)context).isFinishing()) {
+                                        progressDialog.dismiss();
+                                    }
+                                }
+                            });
+                            return;
+                        }
                         MessagesStorage.secretPBytes = res.p;
                         MessagesStorage.secretG = res.g;
                         MessagesStorage.lastSecretVersion = res.version;
diff --git a/TMessagesProj/src/main/java/org/telegram/messenger/TcpConnection.java b/TMessagesProj/src/main/java/org/telegram/messenger/TcpConnection.java
index 48deb6d3c..7711fe471 100644
--- a/TMessagesProj/src/main/java/org/telegram/messenger/TcpConnection.java
+++ b/TMessagesProj/src/main/java/org/telegram/messenger/TcpConnection.java
@@ -85,6 +85,14 @@ public class TcpConnection extends PyroClientAdapter {
 
                 connectionState = TcpConnectionState.TcpConnectionStageConnecting;
                 try {
+                    try {
+                        if (reconnectTimer != null) {
+                            reconnectTimer.cancel();
+                            reconnectTimer = null;
+                        }
+                    } catch (Exception e2) {
+                        FileLog.e("tmessages", e2);
+                    }
                     Datacenter datacenter = ConnectionsManager.Instance.datacenterWithId(datacenterId);
                     hostAddress = datacenter.getCurrentAddress();
                     hostPort = datacenter.getCurrentPort();
diff --git a/TMessagesProj/src/main/java/org/telegram/messenger/Utilities.java b/TMessagesProj/src/main/java/org/telegram/messenger/Utilities.java
index 372f14bbc..d86543bb9 100644
--- a/TMessagesProj/src/main/java/org/telegram/messenger/Utilities.java
+++ b/TMessagesProj/src/main/java/org/telegram/messenger/Utilities.java
@@ -55,6 +55,10 @@ public class Utilities {
     public static int statusBarHeight = 0;
     private final static Integer lock = 1;
 
+    public static String[] goodPrimes = {
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
+    };
+
     public static class TPFactorizedValue {
         public long p, q;
     }
@@ -84,6 +88,39 @@ public class Utilities {
         return ApplicationLoader.applicationContext.getCacheDir();
     }
 
+    final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
+    public static String bytesToHex(byte[] bytes) {
+        char[] hexChars = new char[bytes.length * 2];
+        int v;
+        for ( int j = 0; j < bytes.length; j++ ) {
+            v = bytes[j] & 0xFF;
+            hexChars[j * 2] = hexArray[v >>> 4];
+            hexChars[j * 2 + 1] = hexArray[v & 0x0F];
+        }
+        return new String(hexChars);
+    }
+
+    public static boolean isGoodPrime(byte[] prime) {
+        String hex = bytesToHex(prime);
+        for (String cached : goodPrimes) {
+            if (cached.equals(hex)) {
+                return true;
+            }
+        }
+
+        if (prime.length != 256 || prime[0] >= 0) {
+            return false;
+        }
+
+        BigInteger dhBI = new BigInteger(1, prime);
+        BigInteger dhBI2 = dhBI.subtract(BigInteger.valueOf(1)).divide(BigInteger.valueOf(2));
+        if (!dhBI.isProbablePrime(30) || !dhBI2.isProbablePrime(30)) {
+            return false;
+        }
+
+        return true;
+    }
+
     public static TPFactorizedValue getFactorizedValue(long what) {
         long g = doPQNative(what);
         if (g > 1 && g < what) {
diff --git a/TMessagesProj/src/main/java/org/telegram/ui/ChatProfileActivity.java b/TMessagesProj/src/main/java/org/telegram/ui/ChatProfileActivity.java
index 38bcd6183..69c4ffc78 100644
--- a/TMessagesProj/src/main/java/org/telegram/ui/ChatProfileActivity.java
+++ b/TMessagesProj/src/main/java/org/telegram/ui/ChatProfileActivity.java
@@ -410,6 +410,9 @@ public class ChatProfileActivity extends BaseFragment implements NotificationCen
 
     private void processPhotoMenu(int action) {
         if (action == 0) {
+            if (parentActivity == null) {
+                return;
+            }
             TLRPC.Chat chat = MessagesController.Instance.chats.get(chat_id);
             if (chat.photo != null && chat.photo.photo_big != null) {
                 NotificationCenter.Instance.addToMemCache(53, chat.photo.photo_big);
diff --git a/TMessagesProj/src/main/java/org/telegram/ui/LoginActivity.java b/TMessagesProj/src/main/java/org/telegram/ui/LoginActivity.java
index 68043f12a..ef93b8edf 100644
--- a/TMessagesProj/src/main/java/org/telegram/ui/LoginActivity.java
+++ b/TMessagesProj/src/main/java/org/telegram/ui/LoginActivity.java
@@ -157,14 +157,10 @@ public class LoginActivity extends ActionBarActivity implements SlideView.SlideV
     }
 
     public void setPage(int page, boolean animated, Bundle params, boolean back) {
-        if(android.os.Build.VERSION.SDK_INT > 11) {
+        if(android.os.Build.VERSION.SDK_INT > 13) {
             Point displaySize = new Point();
             Display display = getWindowManager().getDefaultDisplay();
-            if(android.os.Build.VERSION.SDK_INT < 13) {
-                displaySize.set(display.getWidth(), display.getHeight());
-            } else {
-                display.getSize(displaySize);
-            }
+            display.getSize(displaySize);
 
             final SlideView outView = views[currentViewNum];
             final SlideView newView = views[page];
diff --git a/TMessagesProj/src/main/java/org/telegram/ui/UserProfileActivity.java b/TMessagesProj/src/main/java/org/telegram/ui/UserProfileActivity.java
index 0a38f67fe..45c0266f4 100644
--- a/TMessagesProj/src/main/java/org/telegram/ui/UserProfileActivity.java
+++ b/TMessagesProj/src/main/java/org/telegram/ui/UserProfileActivity.java
@@ -257,8 +257,10 @@ public class UserProfileActivity extends BaseFragment implements NotificationCen
             String name = null;
             if (ringtone != null) {
                 Ringtone rng = RingtoneManager.getRingtone(ApplicationLoader.applicationContext, ringtone);
-                name = rng.getTitle(ApplicationLoader.applicationContext);
-                rng.stop();
+                if (rng != null) {
+                    name = rng.getTitle(ApplicationLoader.applicationContext);
+                    rng.stop();
+                }
             }
 
             SharedPreferences preferences = ApplicationLoader.applicationContext.getSharedPreferences("Notifications", Activity.MODE_PRIVATE);
@@ -276,7 +278,6 @@ public class UserProfileActivity extends BaseFragment implements NotificationCen
             editor.commit();
             listView.invalidateViews();
         }
-
     }
 
     public void didReceivedNotification(int id, Object... args) {
diff --git a/TMessagesProj/src/main/java/org/telegram/ui/Views/SizeNotifierRelativeLayout.java b/TMessagesProj/src/main/java/org/telegram/ui/Views/SizeNotifierRelativeLayout.java
index 76257452c..a2b81dd2f 100644
--- a/TMessagesProj/src/main/java/org/telegram/ui/Views/SizeNotifierRelativeLayout.java
+++ b/TMessagesProj/src/main/java/org/telegram/ui/Views/SizeNotifierRelativeLayout.java
@@ -39,9 +39,11 @@ public class SizeNotifierRelativeLayout extends RelativeLayout {
     @Override
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         super.onLayout(changed, l, t, r, b);
-        int usableViewHeight = this.getRootView().getHeight() - Utilities.statusBarHeight;
-        this.getWindowVisibleDisplayFrame(rect);
-        int keyboardHeight = usableViewHeight - (rect.bottom - rect.top);
-        delegate.onSizeChanged(keyboardHeight);
+        if (delegate != null) {
+            int usableViewHeight = this.getRootView().getHeight() - Utilities.statusBarHeight;
+            this.getWindowVisibleDisplayFrame(rect);
+            int keyboardHeight = usableViewHeight - (rect.bottom - rect.top);
+            delegate.onSizeChanged(keyboardHeight);
+        }
     }
 }