WSEAS Transactions on Information Science and Applications
Print ISSN: 1790-0832, E-ISSN: 2224-3402
Volume 19, 2022
A Multi-hop and Distributed Proxy Re-encryption Scheme with Dynamic Re-sharing
Authors: , ,
Abstract: In order to achieve delegated data sharing, a reliable proxy is required for both data storage and execution of the delegated authorization. The PRE scheme is a representative technique for delegating data sharing, which involves a single proxy to transform the encryption by reencrypting algorithm with an auth-key, without knowing any knowledge about the plaintext. However, most PRE schemes are performed in a centralized environment, which means the system will crash upon the proxy is off-work. In this paper, we optimize the PRE scheme from two aspects. Firstly, the proxy acting as the key path is decentralized in a thresholdbased network, which will provide continuous PRE service when any t out of N nodes work. Moreover, considering the flexible entry and exit mechanism of the decentralized nodes, this proposal presents a re-share algorithm to ensure N live nodes. Secondly, we adopt the multi-hop re-encryption strategy for transitivity of ciphertext, so that the data owner is released from re-encryption key generation task upon user requests, and the authorized delegatees are able to retransform the encryption to designated users by using its own secret key.
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Pages: 180-185
DOI: 10.37394/23209.2022.19.18