Study of a Multicast Key Management Scheme Based on the Generalized Cat Map
Bo Qin · 2008
Aiming to deal with 1-affects-n problem in group key management,a multicast encryption algorithm and its corresponding key management scheme where there is a relation of the generalized cat map between the group key and individual keys were proposed by Cao et al..We further analyze the cipher strength,forward /backward secrecy and scalability problems.The analytical results demonstrate that the cipher is not suitable to provide the security service of multicast data confidentiality due to its vulnerability to the known-plaintext attack,and the scheme does not meet the QoS requirement of low bandwidth overhead for key management in a large multicast group because the group size is an asymptotic lower bound for the communication overhead.The analytical methods will also have positive effect on the research into converting other encryption algorithms into group rekeying protocols.