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Rapid developments in wireless technologies in terms of speed, quality and coverage are great motivations that lead to an increase in the use of mobile devices such as laptops and smart phones. These developments facilitate exchanging information anywhere any time. However, some concerns have been raised especially when the mobile users want to access services that provided by foreign networks. These issues can be classified as security and performance matters. This paper proposes a fast and secure authentication protocol. The new feature about this protocol is that the foreign network (FN) can authenticate the mobile user (MU) without checking with the home network (HN). This feature can effectively enhance the network performance as just two messages are required to authenticate the MU. Moreover, we will demonstrate the strengths of this protocol against the common security attacks and we will compare the protocol performance with the previous protocols to ensure efficiency. [ABSTRACT FROM AUTHOR]

Compared with low-dimensional chaos system, Hyperchaos system has excellent security in communication because Hyperchaos sequence has better complexity and randomicity. The thought is proposed that Hyperchaos sequence is applied to Design the pseudorandom sequence after decreasing its dimension, then the novel algorithm is proposed, and the thorough analysis and research are carried on to verify Hyperchaos sequence's capability. Study shows that the novel chaos pseudorandom sequence has good complexity and well-proportioned stochastic diffusion. A novel stochastic sequence design method is achieved. [ABSTRACT FROM AUTHOR]

A definition of the term "Traffic-Flow Security" in telecommunications is presented. The term refers to the use of measures that conceal the presence of valid messages on a communications circuit to prevent traffic analysts. It is normally achieved by causing the circuit to appear busy at all times.

A definition of the term "Tempest Shielding" is presented. It refers to the shielding of devices from electromagnetic interference (EMI) to ensure communications security. Advanced micro-components are used for the most sophisticated devices. It involve encompassing the device in a Faraday cage that does not permit stray emanations together with special modifications to the power source.

A definition of the term "Protection Channel" is presented. It refers to a standby, fully operational facility, that provides diversity for one or several similar channels. It is noted that protection channel can result in improved availability or reliability of the channel when correctly implemented.

A definition of the term "Masquerade" used in relation to communications security is presented. It refers to a type of attack where the attacker pretends to be an authorized user of a system in order to gain access to it or to gain greater privileges than they are authorized for.

An encyclopedia entry for "Communications Protection" is presented. It refers to the application of communications security measures to telecommunications systems. Its main goals are to deny unauthorized users access to sensitive unclassified information, protect telecommunications services from disruptions and ensure the authenticity of information processed by telecommunications systems.

A reference entry for cell payload scrambling, in relation to networking, is presented. It refers to a technique using an asynchronous transfer mode (ATM) switch to maintain framing on some medium-speed edge and trunk interfaces. The purpose of cell payload scrambling is given, as well as the advantages of randomizing the digital bits.