How to TripleDES Encrypt Decrypt Data? – Part One

TripleDES (3DES) is a symmetric-key block cipher that applies the DES cipher algorithm three times to each data block.

Encryption Implementation

csharp

using System;
using System.Security.Cryptography;
using System.Text;

public static string Encrypt(string plainText, string key)
{
    byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
    
    using (TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider())
    {
        tdes.Key = Encoding.UTF8.GetBytes(key.Substring(0, 24));
        tdes.Mode = CipherMode.ECB;
        tdes.Padding = PaddingMode.PKCS7;
        
        ICryptoTransform encryptor = tdes.CreateEncryptor();
        byte[] encryptedBytes = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
        
        return Convert.ToBase64String(encryptedBytes);
    }
}

Key Points

TripleDES key must be 24 bytes (192 bits)
The algorithm applies DES three times
More secure than single DES but slower than AES
Still used in legacy systems

Continue to Part Two for the decryption implementation.

Encryption Implementation

Key Points

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