It is an authenticated encryption algorithm designed to provide both authentication and confidentiality. Access may be with computer security, i.e. authentication and encryption technologies, depending on the requirements. Kerberos allows for mutual authentication between client and server. The security aspect is addressed by offering both strong authentication and data encryption for privacy. It supports password authentication and digital certificate authentication. Access control can be customized via two ways&colon; user authentication and authorization. Informix Dynamic Server supports PAM and other configurable authentication. Checksums are used as cryptographic primitives in larger authentication algorithms. One familiar use of authentication and authorization is access control. Authentication and general encryption formats are listed here. The request router proceeds as before with authentication and authorization. AAA refers to Authentication, Authorization and Accounting. Cryptographic aspects (such as authentication, confidentiality) are also specified. GCM combines the well-known counter mode of encryption with the new Galois mode of authentication. This stands for Protected Extensible Authentication Protocol.