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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 such concept. In this paper, we demonstrate that a certificateless signature scheme proposed by Gong and Li cannot fulfill its security claims. The(More)
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