| Summary: | 碩士 === 國立中興大學 === 資訊科學與工程學系所 === 99 === For solving the key escrow problem in identity-based public key cryptography, certificateless public key cryptography was first invented in 2003 by Al-Riyami and Paterson. With the develop of certificateless cryptography, many related studies have been proposed, such as certificateless encryption and certificateless signature. In 2009, Chang et al. presented a certificateless threshold ring signature scheme. Any member can generate a ring signature to represent n members in this group, and the verifier only knows this signature is from the group. In this thesis, we propose an efficient certificateless threshold ring signature scheme without pairing. In addition, it is provably secure based on the discrete logarithm problem.
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