A direction to avoid re-encryption in cryptographic file sharing

Authors:
Lanxiang Chen;Dan Feng;Lingfang Zeng;Yu Zhang
Affiliations:
School of Computer, Huazhong University of Science and Technology, Key Laboratory of Data Storage System, Ministry of Education, Wuhan, China;School of Computer, Huazhong University of Science and Technology, Key Laboratory of Data Storage System, Ministry of Education, Wuhan, China;School of Computer, Huazhong University of Science and Technology, Key Laboratory of Data Storage System, Ministry of Education, Wuhan, China;School of Computer, Huazhong University of Science and Technology, Key Laboratory of Data Storage System, Ministry of Education, Wuhan, China
Venue:
NPC'07 Proceedings of the 2007 IFIP international conference on Network and parallel computing
Year:
2007

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Abstract

Almost all cryptographic file sharing systems need reencryption when the sharing was revoked. These systems differ from each other only in the timing of re-encryption. As re-encryption is an expensive operation, it is significant to avoid re-encryption. The purpose of this paper is to advise a direction to avoid re-encryption and facilitate file sharing in cryptographic file sharing system. A Black-box model is set up to achieve this objective. In the model, FPGA or ASIC chips are used to act as the black-box as they have been extensively researched and applied in cryptography. Some applications of FPGA and ASIC in cryptography are detailed in this paper. Their feasibility to be functioned as the black-box is discussed. Also a software implementation on FPGA is attached with tested and effective performance.