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Conference Papers Year : 2020

CCA Secure Unidirectional PRE with Key Pair in the Standard Model without Pairings

Abstract

Secure Data sharing has become an ubiquitous need. One way of pursuing it is to use Proxy Re-Encryption (PRE), which allows delegation of decryption rights selectively. This work tackles the problem of designing a Proxy Re-Encryption that is unidirectional and CCA-secure in the standard model without pairings. In (Zhang et al., 2013) they propose a solution that makes the Cramer-Shoup encryption scheme publicly verifiable and use their result to construct a CCA secure PRE in the standard model. However, we show that their scheme is vulnerable against adaptive chosen ciphertexts attacks. Then we propose a new construction based on Cramer-Shoup crypto-system (Cramer and Shoup, 1998), that is CCA secure without pairings nor random oracle
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Dates and versions

hal-02773918 , version 1 (10-04-2021)

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Anass Sbai, C. Drocourt, Gilles Dequen. CCA Secure Unidirectional PRE with Key Pair in the Standard Model without Pairings. 6th International Conference on Information Systems Security and Privacy, Feb 2020, Valletta, Malta. pp.440-447, ⟨10.5220/0008955704400447⟩. ⟨hal-02773918⟩
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