diff --git a/shadowsocks-csharp/Data/libeay32.dll.gz b/shadowsocks-csharp/Data/libeay32.dll.gz
deleted file mode 100755
index 673427ba..00000000
Binary files a/shadowsocks-csharp/Data/libeay32.dll.gz and /dev/null differ
diff --git a/shadowsocks-csharp/Data/ss32.ico b/shadowsocks-csharp/Data/ss32.ico
deleted file mode 100755
index a68e4dbb..00000000
Binary files a/shadowsocks-csharp/Data/ss32.ico and /dev/null differ
diff --git a/shadowsocks-csharp/Encrypt/PolarSSL.cs b/shadowsocks-csharp/Encrypt/PolarSSL.cs
index 193e4ab0..94659c80 100755
--- a/shadowsocks-csharp/Encrypt/PolarSSL.cs
+++ b/shadowsocks-csharp/Encrypt/PolarSSL.cs
@@ -61,22 +61,5 @@ namespace Shadowsocks.Encrypt
         [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
         public extern static int arc4_crypt(IntPtr ctx, int length, byte[] input, byte[] output);
 
-
-        public const int BLOWFISH_CTX_SIZE = 4168;
-        public const int BLOWFISH_ENCRYPT = 1;
-        public const int BLOWFISH_DECRYPT = 0;
-
-        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
-        public extern static void blowfish_init(IntPtr ctx);
-
-        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
-        public extern static void blowfish_free(IntPtr ctx);
-
-        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
-        public extern static int blowfish_setkey(IntPtr ctx, byte[] key, int keysize);
-
-        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
-        public extern static int blowfish_crypt_cfb64(IntPtr ctx, int mode, int length, ref int iv_off, byte[] iv, byte[] input, byte[] output);
-
     }
 }
diff --git a/shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs b/shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs
index 7b369130..959fa350 100755
--- a/shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs
+++ b/shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs
@@ -12,13 +12,11 @@ namespace Shadowsocks.Encrypt
     {
         const int CIPHER_AES = 1;
         const int CIPHER_RC4 = 2;
-        const int CIPHER_BF = 3;
 
         static Dictionary<string, int[]> ciphers = new Dictionary<string, int[]> {
             {"aes-128-cfb", new int[]{16, 16, CIPHER_AES, PolarSSL.AES_CTX_SIZE}},
             {"aes-192-cfb", new int[]{24, 16, CIPHER_AES, PolarSSL.AES_CTX_SIZE}},
             {"aes-256-cfb", new int[]{32, 16, CIPHER_AES, PolarSSL.AES_CTX_SIZE}},
-            {"bf-cfb", new int[]{16, 8, CIPHER_BF, PolarSSL.BLOWFISH_CTX_SIZE}},
             {"rc4", new int[]{16, 0, CIPHER_RC4, PolarSSL.ARC4_CTX_SIZE}},
             {"rc4-md5", new int[]{16, 16, CIPHER_RC4, PolarSSL.ARC4_CTX_SIZE}},
         };
@@ -133,22 +131,6 @@ namespace Shadowsocks.Encrypt
                     Array.Copy(iv, _decryptIV, ivLen);
                 }
             }
-            else if (_cipher == CIPHER_BF)
-            {
-                PolarSSL.blowfish_init(ctx);
-                // PolarSSL takes key length by bit
-                PolarSSL.blowfish_setkey(ctx, realkey, keyLen * 8);
-                if (isCipher)
-                {
-                    _encryptIV = new byte[ivLen];
-                    Array.Copy(iv, _encryptIV, ivLen);
-                }
-                else
-                {
-                    _decryptIV = new byte[ivLen];
-                    Array.Copy(iv, _decryptIV, ivLen);
-                }
-            }
             else if (_cipher == CIPHER_RC4)
             {
                 PolarSSL.arc4_init(ctx);
@@ -180,9 +162,6 @@ namespace Shadowsocks.Encrypt
                         case CIPHER_AES:
                             PolarSSL.aes_crypt_cfb128(_encryptCtx, PolarSSL.AES_ENCRYPT, length, ref _encryptIVOffset, _encryptIV, buf, tempbuf);
                             break;
-                        case CIPHER_BF:
-                            PolarSSL.blowfish_crypt_cfb64(_encryptCtx, PolarSSL.BLOWFISH_ENCRYPT, length, ref _encryptIVOffset, _encryptIV, buf, tempbuf);
-                            break;
                         case CIPHER_RC4:
                             PolarSSL.arc4_crypt(_encryptCtx, length, buf, tempbuf);
                             break;
@@ -204,9 +183,6 @@ namespace Shadowsocks.Encrypt
                     case CIPHER_AES:
                         PolarSSL.aes_crypt_cfb128(_encryptCtx, PolarSSL.AES_ENCRYPT, length, ref _encryptIVOffset, _encryptIV, buf, outbuf);
                         break;
-                    case CIPHER_BF:
-                        PolarSSL.blowfish_crypt_cfb64(_encryptCtx, PolarSSL.BLOWFISH_ENCRYPT, length, ref _encryptIVOffset, _encryptIV, buf, outbuf);
-                        break;
                     case CIPHER_RC4:
                         PolarSSL.arc4_crypt(_encryptCtx, length, buf, outbuf);
                         break;
@@ -233,9 +209,6 @@ namespace Shadowsocks.Encrypt
                         case CIPHER_AES:
                             PolarSSL.aes_crypt_cfb128(_decryptCtx, PolarSSL.AES_DECRYPT, length - ivLen, ref _decryptIVOffset, _decryptIV, tempbuf, outbuf);
                             break;
-                        case CIPHER_BF:
-                            PolarSSL.blowfish_crypt_cfb64(_decryptCtx, PolarSSL.BLOWFISH_DECRYPT, length - ivLen, ref _decryptIVOffset, _decryptIV, tempbuf, outbuf);
-                            break;
                         case CIPHER_RC4:
                             PolarSSL.arc4_crypt(_decryptCtx, length - ivLen, tempbuf, outbuf);
                             break;
@@ -254,9 +227,6 @@ namespace Shadowsocks.Encrypt
                     case CIPHER_AES:
                         PolarSSL.aes_crypt_cfb128(_decryptCtx, PolarSSL.AES_DECRYPT, length, ref _decryptIVOffset, _decryptIV, buf, outbuf);
                         break;
-                    case CIPHER_BF:
-                        PolarSSL.blowfish_crypt_cfb64(_decryptCtx, PolarSSL.BLOWFISH_DECRYPT, length, ref _decryptIVOffset, _decryptIV, buf, outbuf);
-                        break;
                     case CIPHER_RC4:
                         PolarSSL.arc4_crypt(_decryptCtx, length, buf, outbuf);
                         break;
@@ -298,9 +268,6 @@ namespace Shadowsocks.Encrypt
                         case CIPHER_AES:
                             PolarSSL.aes_free(_encryptCtx);
                             break;
-                        case CIPHER_BF:
-                            PolarSSL.blowfish_free(_encryptCtx);
-                            break;
                         case CIPHER_RC4:
                             PolarSSL.arc4_free(_encryptCtx);
                             break;
@@ -315,9 +282,6 @@ namespace Shadowsocks.Encrypt
                         case CIPHER_AES:
                             PolarSSL.aes_free(_decryptCtx);
                             break;
-                        case CIPHER_BF:
-                            PolarSSL.blowfish_free(_decryptCtx);
-                            break;
                         case CIPHER_RC4:
                             PolarSSL.arc4_free(_decryptCtx);
                             break;
diff --git a/shadowsocks-csharp/View/ConfigForm.Designer.cs b/shadowsocks-csharp/View/ConfigForm.Designer.cs
index a9d9a3da..50273d07 100755
--- a/shadowsocks-csharp/View/ConfigForm.Designer.cs
+++ b/shadowsocks-csharp/View/ConfigForm.Designer.cs
@@ -209,7 +209,6 @@
             "aes-256-cfb",
             "aes-192-cfb",
             "aes-128-cfb",
-            "bf-cfb",
             "rc4"});
             this.EncryptionSelect.Location = new System.Drawing.Point(74, 86);
             this.EncryptionSelect.Name = "EncryptionSelect";