There are many different types of products for implementing the security policy on your system. Here you will find information on packet filters, virtual private networking, proxy servers, and firewall projects. This section includes information and software used to improve the security of your Linux host. 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.