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Existing cooperative diversity protocols are designed with the inherent assumption that users exhibit cooperative behavior all the time. However, in a practical cooperative wireless system users may misbehave in malicious or selfish manner. Thus existing cooperative diversity protocols are inherently vulnerable to misbehaving users as they lack a mechanism to detect the presence of such users. In...
Relay nodes are a potential threat to networks since they are used in many malicious situations like stepping stone attacks, botnet communication, peer-to-peer streaming etc. Quick and accurate detection of relay nodes in a network can significantly improve security policy enforcement. There has been significant work done and novel solutions proposed for the problem of identifying relay flows active...
We consider a cooperative diversity scheme where a relay cooperatively enhances communication between a source and destination. In cooperative diversity, due to lack of a mechanism to ensure relay's adherence to the cooperation strategy, the receiver is often assumed to be passive. In this paper, we consider a smart destination which examines relay's signal prior to applying diversity combining. This...
Perceptual hash functions have been recently proposed as cryptographic primitives for multimedia security applications. However, many of these hash functions have been designed with signal processing robustness issues and have not addressed the key issues of confusion and diffusion that are central to the security of conventional hash functions. In this paper we give a definition for confusion and...
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