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Application Gateway: A proxy
service that acts a gateway for application-level protocols, such as FTP,
Telnet, and HTTP.
Authentication: The process
of confirming that a server is indeed who he or she claims to be. The typical authentication method is a
challenge-response method, in which the user enters a user name and a secret password
to confirm his or her identity.
Bastion host: A highly
secured computer typically resides on the perimeter network but a dual homed
host (with one network interface connected to the Internet and the other to
the internal network).
Certificate: An electronic
document that identifies an entity (e.g., an individual organization, or a
computer) and associates a public key with that identity. A certificate contains the certificate
holder’s name, a serial number, expiration dates, a copy of the certificate
holder’s public key, and the digital signature of the certificate
authority. This procedure ensures
that the recipient can verify that the certificate is real.
Certificate Authority: An
organization that validates identities and issues certificates.
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