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During these years, the research field of certificateless signature (CLS) scheme is promptly investigated as the key escrow problem in identity-based cryptography can be solved via CLS concept. However, due to the bandwidth limitation of mobile communication and the resource-constraint property of handheld mobile devices, most CLS schemes cannot fulfill the(More)
During these years, the research field of certificateless signature (CLS) scheme without bilinear pairings is promptly investigated as the key escrow problem in identity-based cryptography can be solved via this concept. In this paper, we demonstrate that a certificateless signature scheme proposed by Gong and Li cannot fulfil its security claims. The(More)
We propose a new secret key traitor tracing scheme using bilinear maps, in which the size of the enabling-block in a broadcast message is independent of the number of subscribers. The proposed traitor tracing scheme can identify malicious subscribers (also called traitors) from a pirate decoder, which is collusively made by k or fewer traitors. Further, any(More)