Secure Broadcasting Using the Secure Lock
IEEE Transactions on Software Engineering
Secure group communications using key graphs
IEEE/ACM Transactions on Networking (TON)
Key management and distribution for secure multimedia multicast
IEEE Transactions on Multimedia
A novel DRM framework for peer-to-peer music content delivery
Journal of Systems and Software
Towards secure and communication-efficient broadcast encryption systems
Journal of Network and Computer Applications
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We address the problem of distributing a confidentially shared session key to a multimedia multicast group for content protection. In two such schemes proposed by Trappe et al., the session key is distributed by employing a homogenized rekey message format. We show that their rekey algorithm in itself is vulnerable to specialized collision attacks, in which even a completely passive outer adversary, who never joins the system and thus never knows any secret user keys, can still reveal the session key of the multimedia multicast with an observable probability but only involving a time complexity far lower than an exhaustive search.