期刊名称：Journal of Wireless Mobile Networks, Ubiquitous Computing, and Dependable Applications
印刷版ISSN：2093-5374
电子版ISSN：2093-5382
出版年度：2013
卷号：4
期号：4
页码：93-107
出版社：Innovative Information Science & Technology Research Group
摘要：A (t,u)- threshold public key encryption (TPKE) is a public key encryption where a private key is splitted among u decryption servers (insiders) and at least t decryption servers (insiders) are required to decrypt the ciphertext but no group of t . 1 or less malicious insiders can decrypt the message. Bendlin and Damgard [1] presented first lattice based threshold public key encryption scheme based on Regev's LWE based encryption system [2]. We propose efficient lattice based threshold public key encryption scheme based on [3]. We have reduced size of the public key from (n 2 + 1)l og n × Z q to (n 2 + 1) × Z q with the same ciphertext size where Z q is the number of bits required to represent an element of Z q . Resplittable threshold public key encryption (RTPKE) was introduced by Hanaoka et al [4] in a generic construction of CCA secure uni-directional proxy re-encryption scheme. RTPKE is a thresh- old public key encryption with an additional randomized algorithm Tsplit. Based on our efficient threshold scheme, we have constructed efficient resplittable threshold public key encryption scheme
关键词：Lattice; Resplittable Threshold Public Key Encryption; Learning With Error (LWE)
