Cryptanalysis of a Polynomial-based Key Management Scheme for Secure Group Communication


Piao et al. proposed a polynomial-based key management scheme for secure intra-group and inter-group communication. In this note, we present a simple attack on this scheme and show that it does not satisfy group forward and backward secrecy. In other words, we show that when a node leaves a group, it can easily compute the new intragroup key based on its… (More)


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