The restriction of access to network realms. In an Apache context usually the restriction of access to certain URLs. See: Authentication, Authorization, and Access Control

An unambiguous formula or set of rules for solving a problem in a finite number of steps. Algorithms for encryption are usually called Ciphers.

A set of libraries providing many of the basic interfaces between the server and the operating system. APR is developed parallel to the Apache HTTP Server as an independent project. See: Apache Portab [..]

The positive identification of a network entity such as a server, a client, or a user. See: Authentication, Authorization, and Access Control

A data record used for authenticating network entities such as a server or a client. A certificate contains X.509 information pieces about its owner (called the subject) and the signing Certification [..]

An unsigned certificate for submission to a Certification Authority, which signs it with the Private Key of their CA Certificate. Once the CSR is signed, it becomes a real certificate. See: SSL/TLS En [..]

A trusted third party whose purpose is to sign certificates for network entities it has authenticated using secure means. Other network entities can check the signature to verify that a CA has authent [..]

An algorithm or system for data encryption. Examples are DES, IDEA, RC4, etc. See: SSL/TLS Encryption

The result after Plaintext is passed through a Cipher. See: SSL/TLS Encryption

A standard definition for an interface between a web server and an external program that allows the external program to service requests. There is an Informational RFC which covers the specifics. See: [..]