標題: Improved convertible authenticated encryption scheme with provable security
作者: Lin, Han-Yu
Hsu, Chien-Lung
Huang, Shih-Kun
資訊工程學系
Department of Computer Science
關鍵字: Cryptography;Convertible;Authenticated encryption;EIGamal system;Provable security;Random oracle model
公開日期: 1-Jul-2011
摘要: Convertible authenticated encryption (CAE) schemes allow a signer to produce an authenticated ciphertext such that only a designated recipient can decrypt it and verify the recovered signature. The conversion property further enables the designated recipient to reveal an ordinary signature for dealing with a later dispute over repudiation. Based on the EIGamal cryptosystem, in 2009, Lee et al. proposed a CAE scheme with only heuristic security analyses. In this paper, we will demonstrate that their scheme is vulnerable to the chosen-plaintext attack and then further propose an improved variant. Additionally, in the random oracle model, we prove that the improved scheme achieves confidentiality against indistinguishability under adaptive chosen-ciphertext attacks (IND-CCA2) and unforgeability against existential forgery under adaptive chosen-message attacks (EF-CMA). (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ipl.2011.03.021
http://hdl.handle.net/11536/22242
ISSN: 0020-0190
DOI: 10.1016/j.ipl.2011.03.021
期刊: INFORMATION PROCESSING LETTERS
Volume: 111
Issue: 13
起始頁: 661
結束頁: 666
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