CR is an emerging technology in wireless communications. Based on their operating environment CRNs can dynamically reconfigure their characteristcics. So that many security issues has been an alarming fact to CRNs. One such attack is the Primary User Emulation Attack (PUEA). There are many techniques available to mitigate this attack. This paper presents a study about various defense techniques...

We propose a distributed spectrum decision protocol resilient to primary user emulation attacks (PUEA) in dynamic spectrum access (DSA) networks. PUEA is a type of denialof-service attack that can result in unreliable and/or disconnected DSA networks by depriving legitimate secondary users of spectrum access. We first propose an individual detection mechanism for secondary users to achieve prel...

Primary User Emulation Attack (PUEA), in which attackers emulate primary user signals causing restriction of secondary access on the attacked channels, is a serious security problem in Cognitive Radio Networks (CRNs). An user performing a PUEA for selfishly occupying more channels is called a selfish PUEA attacker. Network managers could adopt a surveillance process on disallowed channels for i...

A gene (pueA, polyurethane esterase A) encoding an extracellular polyurethanase (PueA) was cloned from Pseudomonas chlororaphis into Escherichia coli. The enzyme secreted from E. coli showed esterase activity when assayed with p-nitrophenyl acetate. Subcloning of a 3. 2-kb SalI-EcoRI fragment into a T7 RNA polymerase expression vector (pT7-6) produced a (35)S-labeled protein of 65 kDa. Nucleoti...

AIMS To better understand the role of PueA and PueB from Pseudomonas chlororaphis in polyurethane degradation, the present study was conducted to create insertional mutants in their respective genes. METHODS AND RESULTS Growth kinetic studies showed that the pueA knockout mutant had a greater effect than the pueB knockout mutant. The pueA mutant had an 80% decrease in cell density from that o...

Due to the fact that security and energy efficiency are investigated separately in the conventional Primary User Emulation Attack (PUEA) countermeasure strategy in Cooperative Spectrum Sensing (CSS) process, the tradeoff between security and energy efficiency is discussed in this paper. CSS can improve detection performance whereas energy consumption will dramatically boost up with the increasi...

Collaborative Spectrum Sensing (CSS) is an effective approach to improve the detection performance in Cognitive Radio (CR) networks. Inherent characteristics of the CR have imposed some additional security threats to the networks. One of the common threats is Primary User Emulation Attack (PUEA). In PUEA, some malicious users try to imitate primary signal characteristics and defraud the CR user...

Cognitive radio is a promising technology aiming to solve the spectrum scarcity problem by allocating the spectrum dynamically to unlicensed users. It uses the free spectrum bands which are not being used by the licensed users without causing interference to the incumbent transmission. So, spectrum sensing is the essential mechanism on which the entire communication depends. If the spectrum sen...

A latest communication technology named “Cognitive Radio Network” is a network in which an un-licensed user can use a freed channel in a spectrum band of licensed user. One of the spectrum management functions is spectrum sensing which the most critical function in the entire communication. If there will be any discrepancy in its functioning then the entire network will be disturbed which would...

Collaborative Spectrum Sensing (CSS) is an effective approach to improve the detection performance in Cognitive Radio (CR) networks. Inherent characteristics of the CR have imposed some additional security threats to the networks. One of the common threats is Primary User Emulation Attack (PUEA). In PUEA, some malicious users try to imitate primary signal characteristics and defraud the CR user...