Multimedia Security Handbook by Miguel J Bagajewicz

By Miguel J Bagajewicz

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Because secure data cannot be communicated during the rekeying process, an important requirement for a key management scheme is to minimize the interruption in secure data communications. Mobility also allows the members to move to other networks without leaving the session. The existence of a member whose position changes with time adds another dimension of complexity to the design of rekeying algorithms. 4. Mobility framework. A common approach in designing a scalable multicast service is to use a hierarchical structure in group key distribution.

In BR, when a member leaves the group, a notification is sent to its current AKD. Immediate rekeying (IR): The member initiates a transfer by sending one notification to AKDi and one notification to AKDj. Area i performs a KEKi rekey and area j performs a KEKj rekey. The only KEK held by a group member is for the area in which it currently resides. Unlike the baseline algorithm, no DEK is generated and data transmission continues uninterrupted. In IR, when a member leaves the group, a notification is sent to its current AKD.

For the ith watermarked frame in stream j, j ¼ 0, 1, a different key Ki, j is used to encrypt it. The random bit stream determines whether the member will be given Ki0 or Ki1 for decryption. If there is only one leaking member, its identification is made possible with the collaboration of the sender who can read the watermarks to produce the bit stream and the group leader who has the bit streams of all members. The minimum length of the retrieved stream to guarantee a c-collusion detection, where c is the number of collaborators, is not known.

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