Abstract:Content distributed by broadcast and multicast services is often encrypted (scrambled) to protect copyrighted material. When any cryptanalysis of the current cryptographic scheme used in such services is found, the scheme must be updated. However, the scheme cannot be updated suddenly because a lot of subscribers have receivers with the current scheme.We have previously proposed two cryptographic scheme updating methods. The two methods have trade-off relationship between security and transmission bit rate. Ho… Show more
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