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http://dx.doi.org/10.13089/JKIISC.2013.23.2.147

A Single Re-encryption key based Conditional Proxy Re-Encryption Scheme  

Son, Junggab (Hanyang University)
Oh, Heekuck (Hanyang University)
Kim, SangJin (Korea University of Technology and Education)
Publication Information
Journal of the Korea Institute of Information Security & Cryptology / v.23, no.2, 2013 , pp. 147-155 More about this Journal
Abstract
Proxy re-encryption scheme has advantage where plaintext does not get exposed during re-encryption process. This scheme is popular for sharing server-saved data in case of cloud computing or mobile office that uses server to save data. Since previous proxy re-encryption schemes can use re-encryption key over and over again, it may abuse re-encryption. To solve this problem, conditional proxy re-encryption scheme was proposed. But, it is computationally expensive generate the same number of re-encryption key with the number of condition values. In this paper, we propose an efficient conditional proxy re-encryption scheme in terms of re-encryption key generation. The proposed scheme uses only encryption and decryption process. Therefore it has advantage to generate one re-encryption key for one person. The proposed scheme is secure against chosen-ciphertext attack.
Keywords
Proxy re-encrpytion; conditional proxy re-encryption; data sharing;
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