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: | 1-七月-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 |
顯示於類別: | 期刊論文 |