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Live streaming is one of many applications where data is continuously created, and has to be quickly distributed among a large number of users. The peer-to-peer paradigm is thereby attracting interest with the prospect of overcoming scalability issues of more centralized approaches. Since data blocks travel along multiple (possibly malicious) peers, authenticating the origin of blocks becomes of prime...
Expected growth in use and implementation of wireless sensor networks (WSNs) in different environments and for different applications creates new security challenges. In WSNs, a malicious node may initiate incorrect path information, change the contents of data packets, and even hijack one or more genuine network nodes. As the network reliability completely depends on individual nodespsila presence...
New definitions are proposed for the security of Transient-Key Cryptography (a variant on Public-Key Cryptography) that account for the possibility of super-polynomial-time, Monte Carlo cryptanalytic attacks. The basic question we address is: how can one relate the amount of time a cryptanalyst is willing to spend decoding cryptograms to his likelihood of success? This question and others are partially...
It seems very difficult to give a formal definition of computational security for Public Key Cryptography. We define a slightly different notion, called Transient-Key Cryptography, for which a natural definition of security against chosen-plaintext-attacks can be given. The main result presented here is the existence of a relativized model of computation under which there exists a provably secure...
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