diff --git a/src/Client/World/WorldSocket.cpp b/src/Client/World/WorldSocket.cpp
index 7c4254c..f255d3f 100644
--- a/src/Client/World/WorldSocket.cpp
+++ b/src/Client/World/WorldSocket.cpp
@@ -4,11 +4,17 @@
 #include "WorldSocket.h"
 #include "Opcodes.h"
 
+
+
 WorldSocket::WorldSocket(SocketHandler &h, WorldSession *s) : TcpSocket(h)
 {
     _session = s;
     _gothdr = false;
     _ok=false;
+    
+    //Dummy functions for unencrypted packets on WorldSocket
+    pDecryptRecv = &AuthCrypt::DecryptRecvDummy;
+    pEncryptSend = &AuthCrypt::EncryptSendDummy;
 }
 
 bool WorldSocket::IsOk(void)
@@ -78,31 +84,43 @@ void WorldSocket::OnRead()
                 break;
             }
 
-            // read first byte and check if size is 3 or 2 bytes
-            uint8 firstSizeByte;
-            ibuf.Read((char*)&firstSizeByte, 1);
-            _crypt.DecryptRecv(&firstSizeByte, 1);
-
-            if (firstSizeByte & 0x80) // got large packet
+            if(GetSession()->GetInstance()->GetConf()->clientbuild > 6005)
             {
-                ServerPktHeaderBig hdr;
-                ibuf.Read(((char*)&hdr) + 1, sizeof(ServerPktHeaderBig) - 1); // read *big* header, except first byte
-                _crypt.DecryptRecv(((uint8*)&hdr) + 1, sizeof(ServerPktHeaderBig) - 1); // decrypt 2 of 3 bytes (first one already decrypted above) of size, and cmd
-                hdr.size[0] = firstSizeByte; // assign missing first byte
+              // read first byte and check if size is 3 or 2 bytes
+              uint8 firstSizeByte;
+              ibuf.Read((char*)&firstSizeByte, 1);
+              (_crypt.*pDecryptRecv)(&firstSizeByte, 1);
+              if (firstSizeByte & 0x80) // got large packet
+              {
+                  ServerPktHeaderBig hdr;
+                  ibuf.Read(((char*)&hdr) + 1, sizeof(ServerPktHeaderBig) - 1); // read *big* header, except first byte
+                  (_crypt.*pDecryptRecv)(((uint8*)&hdr) + 1, sizeof(ServerPktHeaderBig) - 1); // decrypt 2 of 3 bytes (first one already decrypted above) of size, and cmd
+                  hdr.size[0] = firstSizeByte; // assign missing first byte
 
-                uint32 realsize = ((hdr.size[0]&0x7F) << 16) | (hdr.size[1] << 8) | hdr.size[2];
-                _remaining = realsize - 2;
-                _opcode = hdr.cmd;
+                  uint32 realsize = ((hdr.size[0]&0x7F) << 16) | (hdr.size[1] << 8) | hdr.size[2];
+                  _remaining = realsize - 2;
+                  _opcode = hdr.cmd;
+              }
+              else // "normal" packet
+              {
+                  ServerPktHeader hdr;
+                  ibuf.Read(((char*)&hdr) + 1, sizeof(ServerPktHeader) - 1); // read header, except first byte
+                  (_crypt.*pDecryptRecv)(((uint8*)&hdr) + 1, sizeof(ServerPktHeader) - 1); // decrypt all except first
+                  hdr.size |= firstSizeByte; // add already decrypted first byte
+
+                  _remaining = ntohs(hdr.size) - 2;
+                  _opcode = hdr.cmd;
+              }
             }
-            else // "normal" packet
+            else
             {
-                ServerPktHeader hdr;
-                ibuf.Read(((char*)&hdr) + 1, sizeof(ServerPktHeader) - 1); // read header, except first byte
-                _crypt.DecryptRecv(((uint8*)&hdr) + 1, sizeof(ServerPktHeader) - 1); // decrypt all except first
-                hdr.size |= firstSizeByte; // add already decrypted first byte
+              ServerPktHeader hdr;
+              ibuf.Read(((char*)&hdr), sizeof(ServerPktHeader)); // read header, except first byte
+              (_crypt.*pDecryptRecv)(((uint8*)&hdr), sizeof(ServerPktHeader)); // decrypt all except first
 
-                _remaining = ntohs(hdr.size) - 2;
-                _opcode = hdr.cmd;
+              _remaining = ntohs(hdr.size) - 2;
+              _opcode = hdr.cmd;
+              
             }
             
             if(_opcode > MAX_OPCODE_ID)
@@ -114,7 +132,6 @@ void WorldSocket::OnRead()
                 // TODO: invent some way how to recover the crypt (reconnect?)
                 return;
             }
-
             // the header is fine, now check if there are more data
             if(_remaining == 0) // this is a packet with no data (like CMSG_NULL_ACTION)
             {
@@ -138,7 +155,7 @@ void WorldSocket::SendWorldPacket(WorldPacket &pkt)
     memset(&hdr,0,sizeof(ClientPktHeader));
     hdr.size = ntohs(pkt.size()+4);
     hdr.cmd = pkt.GetOpcode();
-    _crypt.EncryptSend((uint8*)&hdr, 6);
+    (_crypt.*pEncryptSend)((uint8*)&hdr, 6);
     ByteBuffer final(pkt.size()+6);
     final.append((uint8*)&hdr,sizeof(ClientPktHeader));
     if(pkt.size())
@@ -148,7 +165,27 @@ void WorldSocket::SendWorldPacket(WorldPacket &pkt)
 
 void WorldSocket::InitCrypt(BigNumber *k)
 {
-    _crypt.Init(k);
+    //As crypt
+    switch(GetSession()->GetInstance()->GetConf()->clientbuild)
+    {
+      case 6005:
+      {
+        logdebug("Setting Crypt to Build 6005");
+        pInit = &AuthCrypt::Init_6005;
+        pDecryptRecv = &AuthCrypt::DecryptRecv_6005;
+        pEncryptSend = &AuthCrypt::EncryptSend_6005;
+        break;
+      }
+      default:
+      {
+        logdebug("Setting Crypt to Build 12340");
+        pInit = &AuthCrypt::Init_12340;
+        pDecryptRecv = &AuthCrypt::DecryptRecv_12340;
+        pEncryptSend = &AuthCrypt::EncryptSend_12340;
+        break;
+      }
+    }
+    (_crypt.*pInit)(k);
     const char *hexstr = k->AsHexStr();
     logdebug("WorldSocket: Crypt initialized [%s]",hexstr);
     OPENSSL_free((void*)hexstr);
diff --git a/src/Client/World/WorldSocket.h b/src/Client/World/WorldSocket.h
index 3a4134e..c398341 100644
--- a/src/Client/World/WorldSocket.h
+++ b/src/Client/World/WorldSocket.h
@@ -7,6 +7,7 @@
 class WorldSession;
 class BigNumber;
 
+
 #if defined( __GNUC__ )
 #pragma pack(1)
 #else
@@ -60,6 +61,9 @@ public:
 private:
     WorldSession *_session;
     AuthCrypt _crypt;
+    void (AuthCrypt::*pInit)(BigNumber *);
+    void (AuthCrypt::*pDecryptRecv)(uint8 *, size_t);
+    void (AuthCrypt::*pEncryptSend)(uint8 *, size_t);
     bool _gothdr; // true if only the header was recieved yet
     uint16 _opcode; // stores the last recieved opcode
     uint32 _remaining; // bytes amount of the next data packet
diff --git a/src/shared/Auth/AuthCrypt.cpp b/src/shared/Auth/AuthCrypt.cpp
index 8a0d14f..ec0ca50 100644
--- a/src/shared/Auth/AuthCrypt.cpp
+++ b/src/shared/Auth/AuthCrypt.cpp
@@ -30,7 +30,8 @@ AuthCrypt::~AuthCrypt()
 
 }
 
-void AuthCrypt::Init(BigNumber *K)
+// 3.3.5
+void AuthCrypt::Init_12340(BigNumber *K)
 {
     uint8 ClientDecryptionKey[SEED_KEY_SIZE] = { 0xCC, 0x98, 0xAE, 0x04, 0xE8, 0x97, 0xEA, 0xCA, 0x12, 0xDD, 0xC0, 0x93, 0x42, 0x91, 0x53, 0x57 };
     HmacHash serverEncryptHmac(SEED_KEY_SIZE, (uint8*)ClientDecryptionKey);
@@ -60,7 +61,7 @@ void AuthCrypt::Init(BigNumber *K)
     _initialized = true;
 }
 
-void AuthCrypt::DecryptRecv(uint8 *data, size_t len)
+void AuthCrypt::DecryptRecv_12340(uint8 *data, size_t len)
 {
     if (!_initialized)
         return;
@@ -68,10 +69,65 @@ void AuthCrypt::DecryptRecv(uint8 *data, size_t len)
     _decrypt.UpdateData(len, data);
 }
 
-void AuthCrypt::EncryptSend(uint8 *data, size_t len)
+void AuthCrypt::EncryptSend_12340(uint8 *data, size_t len)
 {
     if (!_initialized)
         return;
 
     _encrypt.UpdateData(len, data);
 }
+
+
+//1.12.2
+void AuthCrypt::Init_6005(BigNumber *K)
+{
+    _send_i = _send_j = _recv_i = _recv_j = 0;
+    
+    SetKey_6005(K->AsByteArray(),40);
+    _initialized = true;
+  
+}
+
+void AuthCrypt::DecryptRecv_6005(uint8 *data, size_t len)
+{
+    if (!_initialized)
+        return;
+    
+    if (len < CRYPTED_RECV_LEN_6005)
+        return;
+
+    for (size_t t = 0; t < CRYPTED_RECV_LEN_6005; t++)
+    {
+        _recv_i %= _key.size();
+        uint8 x = (data[t] - _recv_j) ^ _key[_recv_i];
+        ++_recv_i;
+        _recv_j = data[t];
+        data[t] = x;
+
+        
+    }
+  
+}
+
+void AuthCrypt::EncryptSend_6005(uint8 *data, size_t len)
+{
+    if (!_initialized)
+        return;
+    if (len < CRYPTED_SEND_LEN_6005) 
+        return;
+
+    for (size_t t = 0; t < CRYPTED_SEND_LEN_6005; t++)
+    {
+        _send_i %= _key.size();
+        uint8 x = (data[t] ^ _key[_send_i]) + _send_j;
+        ++_send_i;
+        data[t] = _send_j = x;
+    }
+
+}
+
+void AuthCrypt::SetKey_6005(uint8 *key, size_t len)
+{
+    _key.resize(len);
+    std::copy(key, key + len, _key.begin());
+}
diff --git a/src/shared/Auth/AuthCrypt.h b/src/shared/Auth/AuthCrypt.h
index 28ee766..70bb165 100644
--- a/src/shared/Auth/AuthCrypt.h
+++ b/src/shared/Auth/AuthCrypt.h
@@ -30,15 +30,35 @@ class AuthCrypt
         AuthCrypt();
         ~AuthCrypt();
 
-        void Init(BigNumber *K);
-        void DecryptRecv(uint8 *, size_t);
-        void EncryptSend(uint8 *, size_t);
+        //Dummy
+        void DecryptRecvDummy(uint8 *, size_t){return;};
+        void EncryptSendDummy(uint8 *, size_t){return;};
+
+        //3.3.5
+        void Init_12340(BigNumber *K);
+        void DecryptRecv_12340(uint8 *, size_t);
+        void EncryptSend_12340(uint8 *, size_t);
+
+        //1.12.X
+        void Init_6005(BigNumber *K);
+        void SetKey_6005(uint8 *, size_t);
+        void DecryptRecv_6005(uint8 *, size_t);
+        void EncryptSend_6005(uint8 *, size_t);
 
         bool IsInitialized() { return _initialized; }
 
+        const static size_t CRYPTED_SEND_LEN_6005 = 6;
+        const static size_t CRYPTED_RECV_LEN_6005 = 4;
+
+
     private:
+        bool _initialized;
+        //3.3.5
         SARC4 _decrypt;
         SARC4 _encrypt;
-        bool _initialized;
+        
+        //1.12.2
+        std::vector<uint8> _key;
+        uint8 _send_i, _send_j, _recv_i, _recv_j;
 };
 #endif