//Wywołanie metod do utworzenia klucza szyfrowania
private void CreateKey()
        {
            aesEncryptor = CreateEncryptor();
            var based64Key = Convert.ToBase64String(aesEncryptor.Key);
            var encryptedKey = EncryptRSA(based64Key);
            jpkMetaData.encryptionKey = Convert.ToBase64String(encryptedKey);
        }


//Konstruktor szyfratora
private RijndaelManaged CreateEncryptor()
        {
            var myEncryptor = new RijndaelManaged();
            myEncryptor.KeySize = 256;
            myEncryptor.GenerateIV();
            myEncryptor.GenerateKey();
            return myEncryptor;
        }

//Szyfrowanie pliku
private byte[] EncryptRSA(string plainText)
        {
            byte[] toEncrypt = Encoding.UTF8.GetBytes(plainText);

            string pathToSecurityFolder = Path.Combine(HttpContext.Current.Request.PhysicalApplicationPath, "Security");
            X509Certificate2 cert = new X509Certificate2(pathToSecurityFolder + @"\3af5843ae11db6d94edf0ea502b5cd1a.pem");

            var RSACryptor = (RSACryptoServiceProvider) cert.PublicKey.Key;

            return RSACryptor.Encrypt(toEncrypt, false);
        }