//this delegate method must be present for Decryption, otherwise the logic would not work: UT
private void pgpReader_OnKeyPassphrase(object Sender, TElPGPCustomSecretKey Key, ref string Passphrase, ref bool Cancel)
{
Passphrase = string.Empty;
}
void encrypter_OnKeyPassphrase(object Sender, TElPGPCustomSecretKey Key,
ref string Passphrase, ref bool Cancel)
{
Passphrase = _passphrase;
}