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copied!<p>Here's a couple of functions that use the .NET framework to encrypt and decrypt a string:</p> <pre><code>public string EncryptString(string plainText) { // Instantiate a new RijndaelManaged object to perform string symmetric encryption RijndaelManaged rijndaelCipher = new RijndaelManaged(); // Set key and IV rijndaelCipher.Key = Convert.FromBase64String("ABC"); rijndaelCipher.IV = Convert.FromBase64String("123"); // Instantiate a new MemoryStream object to contain the encrypted bytes MemoryStream memoryStream = new MemoryStream(); // Instantiate a new encryptor from our RijndaelManaged object ICryptoTransform rijndaelEncryptor = rijndaelCipher.CreateEncryptor(); // Instantiate a new CryptoStream object to process the data and write it to the // memory stream CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelEncryptor, CryptoStreamMode.Write); // Convert the plainText string into a byte array byte[] plainBytes = Encoding.ASCII.GetBytes(plainText); // Encrypt the input plaintext string cryptoStream.Write(plainBytes, 0, plainBytes.Length); // Complete the encryption process cryptoStream.FlushFinalBlock(); // Convert the encrypted data from a MemoryStream to a byte array byte[] cipherBytes = memoryStream.ToArray(); // Close both the MemoryStream and the CryptoStream memoryStream.Close(); cryptoStream.Close(); // Convert the encrypted byte array to a base64 encoded string string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length); // Return the encrypted data as a string return cipherText; } public string DecryptString(string cipherText) { // Instantiate a new RijndaelManaged object to perform string symmetric encryption RijndaelManaged rijndaelCipher = new RijndaelManaged(); // Set key and IV rijndaelCipher.Key = Convert.FromBase64String("ABC"); rijndaelCipher.IV = Convert.FromBase64String("123"); // Instantiate a new MemoryStream object to contain the encrypted bytes MemoryStream memoryStream = new MemoryStream(); // Instantiate a new encryptor from our RijndaelManaged object ICryptoTransform rijndaelDecryptor = rijndaelCipher.CreateDecryptor(); // Instantiate a new CryptoStream object to process the data and write it to the // memory stream CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelDecryptor, CryptoStreamMode.Write); // Will contain decrypted plaintext string plainText = String.Empty; try { // Convert the ciphertext string into a byte array byte[] cipherBytes = Convert.FromBase64String(cipherText); // Decrypt the input ciphertext string cryptoStream.Write(cipherBytes, 0, cipherBytes.Length); // Complete the decryption process cryptoStream.FlushFinalBlock(); // Convert the decrypted data from a MemoryStream to a byte array byte[] plainBytes = memoryStream.ToArray(); // Convert the encrypted byte array to a base64 encoded string plainText = Encoding.ASCII.GetString(plainBytes, 0, plainBytes.Length); } finally { // Close both the MemoryStream and the CryptoStream memoryStream.Close(); cryptoStream.Close(); } // Return the encrypted data as a string return plainText; } </code></pre> <p>Of course I don't advise hardcoding the key and initialisation vector like this :)</p>

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