Transformation-free proxy cryptosystems and their applications to electronic commerce

Authors:
Lihua Wang;Zhenfu Cao;Eiji Okamoto;Ying Miao;Takeshi Okamoto
Affiliations:
University of Tsukuba, Tsukuba, Japan;Shanghai Jiao Tong University, Shanghai, P. R. China;University of Tsukuba, Tsukuba, Japan;University of Tsukuba, Tsukuba, Japan;University of Tsukuba, Tsukuba, Japan
Venue:
InfoSecu '04 Proceedings of the 3rd international conference on Information security
Year:
2004

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Abstract

In this paper transformation-free proxy cryptosystems (TFP systems) are studied. The TFP system is a modification of the proxy cryptosystem introduced by Mambo and Okamoto [6] in which a ciphertext transformation by the original decryptor is necessary. The TFP system allows proxy decryptor to do decryption without any ciphertext transformation, so that it can release the original decryptor more efficiently from a large amount of decrypting operations. An active identity-based and a directory-based TFP systems based on pairings are proposed. Furthermore, two applications of directory-based TFP system in electronic commerce are also investigated.