public static byte[] Encrypt(byte[] plainBytes, X509Certificate2 cert)
    {
        RSACryptoServiceProvider publicKey = (RSACryptoServiceProvider)cert.PublicKey.Key;
        byte[] encryptedBytes = publicKey.Encrypt(plainBytes, false);
        return encryptedBytes;
    }

    public static byte[] Decrypt(byte[] encryptedBytes, X509Certificate2 cert)
    {
        RSACryptoServiceProvider privateKey = (RSACryptoServiceProvider)cert.PrivateKey;
        byte[] decryptedBytes = privateKey.Decrypt(encryptedBytes, false);
        return decryptedBytes;
    }