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Cryptanalysis of a Fuzzy Identity Based Encryption Scheme in the Standard Model
Volume 23, Issue 2 (2012), pp. 299–314
Xu An Wang   Xiaoyuan Yang   Minqing Zhang   Yong Yu  

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https://doi.org/10.15388/Informatica.2012.361
Pub. online: 1 January 2012      Type: Research Article     

Received
1 October 2010
Accepted
1 December 2011
Published
1 January 2012

Abstract

Fuzzy identity based encryption (FIBE), proposed by Sahai and Waters, is a new kind of identity based encryption. It allows users with identity w can decrypt ciphertext for w' if and only if w is close enough to w'. Recently, Ren et al. proposed a new FIBE scheme and claimed it is fully CCA2 secure in the standard model with a tight reduction. However, in this paper we will show that their scheme is not correct. Furthermore, the key generation process of their scheme cannot resist the collusion attack, which is a basic security requirement for FIBE. At last, we propose a new fully secure FIBE scheme based on the Sahai–Waters FIBE scheme and prove its security by using the “dual system encryption” technique.

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Keywords
cryptography fuzzy identity based encryption fully secure CCA2-secure attack

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INFORMATICA

  • Online ISSN: 1822-8844
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