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Different information has different importance in respective sectors. Information can be about security, about monitoring, about observations or about detection. Similarly depending on the information sensitivity different methods of Information retrieval and algorithms are used with the help of suitable retrieval systems. This paper first discuss about Information retrieval systems based on retrieval methods and their use in different areas and then starting from the birth of radar, the evolution and advancement in radar systems as information retrieval system is studied to retrieve the required and suitable information for the purpose of security, monitoring, observation and tracking. Finally based on the technologies, electromagnetic consumption and the FCC standards, radar based time a line of the information retrieval systems is studied. [ABSTRACT FROM AUTHOR]

An encyclopedia entry for "Network Layer Firewall" is presented. It is a type of firewall that works as a packet filter by deciding what packets will pass the firewall according to rules defined by the administrator. Generally, network layer firewalls fall into two sub-categories, stateful and non-stateful.

A definition of the term "Biba Model" is presented. It refers to a formal state transition system of computer security policy that describes a set of access control rules designed to ensure that data is not contaminated. To express integrity policies that refer to the corruption of clean higher level entities by dirty lower level entities, a lattice of integrity levels is used.

A definition of the term "Program Policy" is presented. It refers to a high-level policy that sets the overall tone of an organization's security approach.

A definition of "local traffic filtering" is presented. Local traffic filtering, which is defined in the IEEE 802.1 standard, refers to the process by which a bridge filters out frames whose source and destination MAC addresses are located on the same interface on the bridge, thus preventing unnecessary traffic from being forwarded across the bridge.

A reference entry for the "Federal Information Technology Security Assessment Framework" is presented. It refers to a methodology for analyzing the security of information systems.

An encyclopedia entry for the "Department of Defense Information Technology Security Certification and Accreditation Process" is presented. The Department of Defense Information Technology Security Certification and Accreditation Process is a standardized approach used for certification of the security of information technology.

A definition of the term "Content Filtering" is presented. It is accomplished by using database of terminology, words and phrases that are compared to those emanating from the content of the Internet browser, emails and other applications. It requires an agent on each workstation that checks the content data to determine whether it violates the policy of an organization.

A reference entry for the Center for Education and Research in Information Assurance and Security (CERIAS) is presented. It refers to a research and education center on information security at Purdue University.

A definition of the term "Audit" is presented. In the field of information security, the term refers to the conduct of an independent review and examination system records and activities in order to test the adequacy and effectiveness of data security and data integrity procedures. It also refers to the independent review and examination of records and activities to assess the adequacy of system controls. All these actions are aimed at complying with established policies and operational procedures.