ITU X.509 - digital certificate (like identity card authorized by Certificate Authority (CA)) |
SSL - Secure Socket Layer |
PAP - Password Authentication Protocol |
CHAP- Challenge Handshake Authentication Protocol |
TACACS - Terminal Access Controller Access-Control System |
RADIUS - Remote Authentication Dial-In User Service |
PKCS - Public Key Cryptography Standards |
PGP - Pretty Good Privacy |
S/MIME - Secure Multipurpose Internet Mail Extension |
PEM - Privacy Enhanced Mail |