Encrypting and Decrypting string in c# using System.Security.Cryptography

    Its pretty simple to encrypt and decrypt a string in c#.

using System.Security.Cryptography;
 
static string key = "ABC12@#a"; // you can set any key here.

public string Encrypt(string source, string key)
{

    TripleDESCryptoServiceProvider desCryptoProvider =
new TripleDESCryptoServiceProvider();

    MD5CryptoServiceProvider hashMD5Provider = new MD5CryptoServiceProvider();

    byte[] byteHash;

    byte[] byteBuff;

    byteHash = hashMD5Provider.ComputeHash(Encoding.UTF8.GetBytes(key));

    desCryptoProvider.Key = byteHash;

    desCryptoProvider.Mode = CipherMode.ECB; //CBC, CFB

    byteBuff = Encoding.UTF8.GetBytes(source);

    string encoded =

        Convert.ToBase64String(desCryptoProvider.CreateEncryptor().
TransformFinalBlock(byteBuff, 0, byteBuff.Length));

    return encoded;
}

public static string Decrypt(string encodedText, string key)

{

    TripleDESCryptoServiceProvider desCryptoProvider =
new TripleDESCryptoServiceProvider();

    MD5CryptoServiceProvider hashMD5Provider = new MD5CryptoServiceProvider();

    byte[] byteHash;

    byte[] byteBuff;

    byteHash = hashMD5Provider.ComputeHash(Encoding.UTF8.GetBytes(key));

    desCryptoProvider.Key = byteHash;

    desCryptoProvider.Mode = CipherMode.ECB; //CBC, CFB

    byteBuff = Convert.FromBase64String(encodedText);

    string plaintext = Encoding.UTF8.GetString(desCryptoProvider.
CreateDecryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length));

    return plaintext;

}