private static void TestSymmetricCryptoAPI()
{
string messageToEncrypt1 = "Alice knows Bob's secret.";
string messageToEncrypt2 = "Alice knows Bob's favorite color.";
SymmetricAlgorithm aes = new AesCryptoServiceProvider();
aes.KeySize = 256;
byte[] key = aes.Key; // The symmetric key used for encrypt - decrypt - same for both messages
byte[] encryptedMessage1 = SymmetricCrypto.EncryptWithAes(messageToEncrypt1, aes);
byte[] iv1 = aes.IV;
string decryptedMessage1 = SymmetricCrypto.DecryptMessageWithAES(key, iv1, encryptedMessage1);
aes = new AesCryptoServiceProvider();
aes.KeySize = 256;
aes.Key = key;
byte[] encryptedMessage2 = SymmetricCrypto.EncryptWithAes(messageToEncrypt2, aes);
byte[] iv2 = aes.IV;
string decryptedMessage2 = SymmetricCrypto.DecryptMessageWithAES(key, iv2, encryptedMessage2);
}