diff --git a/source/WindowsFormsApplication1/API.cs b/source/WindowsFormsApplication1/API.cs
index 9c8c69c..f952a18 100644
--- a/source/WindowsFormsApplication1/API.cs
+++ b/source/WindowsFormsApplication1/API.cs
@@ -474,6 +474,33 @@ public static string Encrypt(string plainText)
                 }
             }
 
+            public static string Encrypt_old(string plainText)
+            {
+                byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
+                using (PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null))
+                {
+                    byte[] keyBytes = password.GetBytes(keysize / 8);
+                    using (RijndaelManaged symmetricKey = new RijndaelManaged())
+                    {
+                        symmetricKey.Mode = CipherMode.CBC;
+                        using (ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes))
+                        {
+                            using (MemoryStream memoryStream = new MemoryStream())
+                            {
+                                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
+                                {
+                                    cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
+                                    cryptoStream.FlushFinalBlock();
+                                    byte[] cipherTextBytes = memoryStream.ToArray();
+                                    return Convert.ToBase64String(cipherTextBytes);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+
             /// <summary>
             /// Decrypts an encrypted string.
             /// </summary>
diff --git a/source/WindowsFormsApplication1/Engine/Lua_Interp.cs b/source/WindowsFormsApplication1/Engine/Lua_Interp.cs
index 21acb3c..88a51a3 100644
--- a/source/WindowsFormsApplication1/Engine/Lua_Interp.cs
+++ b/source/WindowsFormsApplication1/Engine/Lua_Interp.cs
@@ -399,8 +399,8 @@ public void RegisterCore()
             mod.get_codepoints = new Func<int>(() => GetCP());
             mod.buy_upgrade = new Func<string, bool>((id) => BuyUPG(id));
             mod.time = new Func<string>(() => API.GetTime());
-            mod.encrypt = new Func<string, string>((raw) => API.Encryption.Encrypt(raw));
-            mod.decrypt = new Func<string, string>((raw) => API.Encryption.Decrypt(raw));
+            mod.encrypt = new Func<string, string>((raw) => API.Encryption.Encrypt_old(raw));
+            mod.decrypt = new Func<string, string>((raw) => API.Encryption.Decrypt_old(raw));
             mod.fread = new Func<string, string>((filepath) => SafeFileRead(filepath));
             mod.terminal = new Action<string>((command) =>
             {