Analysis and Improvement of Separable and Anonymous Identity-Based Private Key Issuing
Hu L · Microcomputer Information · 2008
Sui,et al. proposed a novel separable and anonymous identity-based key issuing scheme called SAKI based on bilinear pairings. SAKI which uses password authentication and blind signature solves problems of authenticating the user's identity and issuing private keys in identity-based cryptosystems. This paper investigates SAKI and concludes that SAKI is incompetent of pretending the integrity of the message requesting for a private key and is vulnerable against the dictionary attack. A new scheme is proposed to repair SAKI and improve the security of SAKI.