Triple DES Encryption & Decryption

This project implements Triple DES (3DES) encryption and decryption in C#. It supports TDES-168 (three keys) and TDES-112 (two keys) modes with CBC and ECB cipher modes.

Features

✅ Supports TDES-168 (24-byte key) and TDES-112 (16-byte key, K3 = K1)
✅ Supports CBC (Cipher Block Chaining) and ECB (Electronic Codebook) modes
✅ Supports PKCS7 and ZeroPadding
✅ Handles HEX or Base64 encoding
✅ User input validation with automatic key field disabling for TDES-112

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Getting Started

Prerequisites

• .NET 8.0
• Windows OS (for running Windows Forms applications)

Setup Instructions

1. Clone the Repository

git clone https://github.com/YanuarGuo/TripleDESEncryption.git

2. Open in Visual Studio

• Open the .sln file in Visual Studio.
• Ensure you have .NET 8 or Higher installed.

3. Build & Run

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Usage

Encrypting a String

string encrypted = TripleDESEncryption.Encrypt(
    "Hello, World!",
    "12345678ABCDEFGH87654321", // Key (16 or 24 bytes)
    "ABCDEFGH",                 // IV (8 bytes, for CBC mode only)
    "PKCS7",                    // Padding mode
    "HEX",                       // Output format (HEX or Base64)
    "CBC",                       // Cipher mode (CBC or ECB)
    "TDES-168"                   // TDES Mode (TDES-168 or TDES-112)
);
Console.WriteLine($"Encrypted: {encrypted}");

Decrypting a String

string decrypted = TripleDESEncryption.Decrypt(
    encrypted,
    "12345678ABCDEFGH87654321",
    "ABCDEFGH",
    "PKCS7",
    "HEX",
    "CBC",
    "TDES-168"
);
Console.WriteLine($"Decrypted: {decrypted}");

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Key Handling

• TDES-168 (3 keys, 24 bytes): Uses K1-K2-K3
• TDES-112 (2 keys, 16 bytes): Uses K1-K2-K1

Your UI should disable TxtKey3 when TDES-112 is selected:

private void CbMode3DES_SelectedIndexChanged(object sender, EventArgs e)
{
    if (CbMode3DES.Text == "TDES-112")
    {
        TxtKey3.Text = "";  // Clear Key3
        TxtKey3.Enabled = false;
    }
    else
    {
        TxtKey3.Enabled = true;
    }
}

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Author

Developed by Yanuar Christy Ade Utama.

Contributions

Feel free to submit issues, feature requests, or pull requests to improve this project!