Authentication, authorization, host security scanners, monitoring tools, etc. Security scanners can be used to probe your system and find problematic software which may lead to an intrusion. Cryptography is the art or science of keeping a message secret. Encryption is a method of converting your data into a form that only authorized people can see. This section also contains information on providing and improving user authentication.
Digital certificates is one example of host or user authentication using a form of encryption.
This section presents pointers to information on how to better secure your Linux systems from network attacks. Host-based IDS products can be used to alert you to a intrusion in progress, or one that has already occurred. Network IDS products can be used to alert you to an intruder on your network. What's more, Bugtraq is a popular full-disclosure mailing list that provides information on security vulnerabilities. These and other organizations host events that relate to Linux and security.