bool nag_alter_decryption_chain ();
void decryption_advanced ();
void signing_advanced ();
void export_decryption_chain_and_key ();
void import_decryption_chain_and_key ();
bool nag_alter_decryption_chain ();
void decryption_advanced ();
void signing_advanced ();
void export_decryption_chain_and_key ();
void import_decryption_chain_and_key ();