Cuvinte cheie: SSH, ssh-agent, sshd, iptables, iptables-save, iptables-restore, GPG, keyring,
ASCII armor, criptare, decriptare, semnare, verificare, TLS/SSL, OpenSSL, certificat digital, CSR, X.509, CA, openssl, TCP Wrapper, DenyHosts, Fail2ban, PAM