Weaknesses and improvements of an efficient certificateless signature scheme without using bilinear pairings

作者：Tsai Jia Lun^*; Lo Nai Wei; Wu Tzong Chen

来源：International Journal of Communication Systems, 2014, 27(7): 1083-1090.

DOI：10.1002/dac.2388

• certificateless signature
• key escrow problem
• identity-based
• key generator center (KGC)

The certificateless signature (CLS) scheme is a special signature scheme that solves the key escrow problem in identity-based signature schemes. In CLS schemes, the private key is generated cooperatively by the key generator center (KGC) and signer, such that a malicious KGC cannot masquerade as the signer and sign a message. He et al. in 2011 proposed an efficient CLS scheme without using bilinear pairings. However, we discovered that the CLS scheme by He et al. cannot resist a strong type 2 adversary if this adversary replaces the master public key of the KGC. This work proposes an improved scheme that overcomes this weakness.

• 出版日期2014-7