科研之友
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摘要
Traitor tracing schemes constitute a very useful tool against piracy in the context of digital content broad- cast. In such multi-recipient encryption schemes, the data-suppliers can reveal the identities of the subscribers that were implicated in the construction of a pirate-device that illegally receives the digital content. In this paper, a traitor tracing scheme based on the RSA system is pro- posed. The scheme does not rely on any trusted third party, and is k-collusion resistant, can provide black-box confirmability, and revoke any traitor's personal decryp-tion key (without the limitation to threshold) without updating the personal decryption key of the remaining subscribers. And the scheme is more efficient than the ElGamal-like scheme according to complexity overload. Its security is the same as that of the RSA system.
