Abstract
A Cramer-Shoup scheme was modified in a variant way. The major advantage with respect to Kurosawa-Desmedt scheme is that it saves a key parameter and produces shorter ciphertext. The proof of security shows that our scheme can be instantiated with any computational secure key derivation and message authentication functions. Thus it extends the applicability of the Kurosawa-Desmedt scheme and improves its efficiency.
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Foundation item: the National Basic Research Program (973) of China (No 2007CB807903); the National Natural Science Foundation of China (No. 60743006); the Natural Science Foundation of Shandong Province (No. Y2007G15); the Shandong Grant program for Post PH.D (No. 200601002)
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Wang, Mq., Qin, J. A note on a provable secure encryption scheme. J. Shanghai Jiaotong Univ. (Sci.) 13, 655–658 (2008). https://doi.org/10.1007/s12204-008-0655-x
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DOI: https://doi.org/10.1007/s12204-008-0655-x