Secure electronic auction scheme based on the group signature
Yumin Wang · Journal of Xidian University · 2008
Based on Linear Cramer-Shoup encryption,a new short group signature is proposed.The anonymity property of this scheme is secure against adaptive chosen-ciphertext attacks(CCA2),which allows the adversary to open the signature when trying to break the anonymity notion.Using this group signature as a building block,a secure electronic auction scheme is designed.Under the same security conditions,the scheme has sizes of signature,group public key,signing key,register key and tracing key 1/14,1/7,1/17,1/40 and 1/4 those of the scheme based on the RSA problem.Compared with the pairing-based scheme in which the bidder's anonymity is CPA secure,the complexities of communication and computation in this paper are approximate to those in the former,but the CCA2-full-anonymity of bidders is achieved in this new scheme.