摘要
提出一个在不存在单一可信第3方的分布式环境中的乐观公平交换协议。该协议的整个交换过程分为秘密分块密文交换阶段和密钥步进式交换阶段。双方都能以高概率在交换过程中检测到欺骗行为,从而停止揭示剩余的秘密分块,只有在最后阶段出现异常情况才会求助一个门限解密组。该协议不基于双方相等计算能力的假设,也不依赖于可信第3方来确保公平性,计算复杂度与已有的小步进交换协议相当,而通信复杂度更低。
An optimistic fair exchange protocol in distributed settings without a single trusted third party is proposed.In this protocol,the exchange process consists of secret share ciphertext exchange phase and key gradual exchange phase.Each party is able to stop releasing the rest secret shares in case of cheat,which can be detected with high probability during the process.A threshold decryption group is involved only when unfair behavior occurs in the last exchange round.The proposed protocol does not rely on equal computing power assumption or a trusted third party to guarantee fairness.It also has equivalent computation complexity and smaller communication complexity compared with previous gradual release schemes.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2011年第1期100-104,共5页
Journal of University of Electronic Science and Technology of China
基金
教育部高等学校博士学科点专项科研基金(20050614018)
四川省科技攻关计划(05GG007-011-01)
关键词
电子商务
信息安全
乐观公平交换
门限密码
可信第3方
electronic commerce
information security
optimistic fair exchange
threshold cryptography
trusted third party
