关键词: 离散对数问题, 叛逆者追踪, 完全撤销性, 完全可恢复性, 黑盒追踪

Abstract:

Based on the discrete log representation problem and employing random sequence,an anonymous public key traitor tracing scheme is presented in this paper.This scheme employs the polynomial function and the filter function as the basic means of constructing the traitor tracing procedures.When a pirate decoder is confiscated,single input and output suffices to decide the traitor.If it is necessary to revoke or recover traitors,the scheme can safely revoke or recover the private keys of traitors without updating the private keys of other receivers.The performance analysis shows that the proposed scheme not only has low cost of secure storage,calculation and communication,but also is capable of full collusion resistance,full revocability,full recoverability and blackbox traceability.

Key words: discrete log representation problem;traitor tracing;full revocability;full recoverability;black box traceability