IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Regular Section
Relaxing Enhanced Chosen-Ciphertext Security
Honglong DAIJinying CHANGZhenduo HOUMaozhi XU
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2018 Volume E101.A Issue 12 Pages 2454-2463

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Abstract

The enhanced chosen-ciphertext security (ECCA) is motivated by the concept of randomness recovering encryption, which was presented by Dana Dachman-Soled et al. in PKC 2014 [9]. ECCA security is the enhanced version of CCA security. CCA security often appears to be somewhat too strong, so ECCA security is also too strong: there exist encryption schemes that are not ECCA secure but still have some practical application. Canetti et al. proposed a relaxed variant of CCA security called Replayable CCA (RCCA) security in CRYPTO 2003 [3]. In this paper, we propose a relaxed variant of ECCA security called Replayable security (RECCA). RECCA security is the enhanced version of RCCA security. Since RCCA security suffices for the most existing application of CCA security, RECCA security also suffices for them, too. Moreover, RECCA security provides a useful general version of security against active attacks.

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© 2018 The Institute of Electronics, Information and Communication Engineers
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