IPTV service provider only allows the users authorized by CAS to access to the contents. In CAS, hierarchical key structure is used to manage users efficiently and securely.The amount of message transmission for key update increases as the number of users goes up. In this paper, we propose the IPTV CAS using group key management scheme based on bottom-up hash tree. The proposed scheme can update key using one message regardless of the number of users.
In this paper, we propose a key management scheme in DRM which supports multi devices by using a secret sharing. The proposed scheme enables playing contents on registered devices only, and additional overheads are not occurring even if the number of registered devices are increased. We measured the overheads occurred by the proposed scheme through a prototype implementation, and showed that the scheme is applicable to consumer devices.
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