http://os3.i2p/info/curriculum/ssn?do=admin
Systems use several methods for protection: plaintext passwords, one-time passwords, encrypted passwords, public/private key pairs and certificates. Networks are protected with firewalls and network layer encryption. The course discusses remote access through SSH, secured web transactions using SSL/TLS, single signon with Kerberos, secure email using PGP/GPG, IPsec and key management...