{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,5,15]],"date-time":"2024-05-15T23:10:18Z","timestamp":1715814618070},"reference-count":0,"publisher":"University of Zielona G\u00f3ra, Poland","issue":"2","license":[{"start":{"date-parts":[[2015,6,1]],"date-time":"2015-06-01T00:00:00Z","timestamp":1433116800000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2015,6,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p> Fehr et al. (2010) proposed the first sender-equivocable encryption scheme secure against chosen-ciphertext attacks (NCCCA) and proved that NC-CCA security implies security against selective opening chosen-ciphertext attacks (SO-CCA). The NC-CCA security proof of the scheme relies on security against substitution attacks of a new primitive, the \u201ccrossauthentication code\u201d. However, the security of the cross-authentication code cannot be guaranteed when all the keys used in the code are exposed. Our key observation is that, in the NC-CCA security game, the randomness used in the generation of the challenge ciphertext is exposed to the adversary. Based on this observation, we provide a security analysis of Fehr et al.\u2019s scheme, showing that its NC-CCA security proof is flawed. We also point out that the scheme of Fehr et al. encrypting a single-bit plaintext can be refined to achieve NC-CCA security, free of the cross-authentication code. Furthermore, we propose the notion of \u201cstrong cross-authentication code\u201d, apply it to Fehr et al.\u2019s scheme, and show that the new version of the latter achieves NC-CCA security for multi-bit plaintexts.<\/jats:p>","DOI":"10.1515\/amcs-2015-0032","type":"journal-article","created":{"date-parts":[[2015,6,25]],"date-time":"2015-06-25T17:01:08Z","timestamp":1435251668000},"page":"415-430","source":"Crossref","is-referenced-by-count":0,"title":["Sender-equivocable encryption schemes secure against chosen-ciphertext attacks revisited"],"prefix":"10.61822","volume":"25","author":[{"given":"Zhengan","family":"Huang","sequence":"first","affiliation":[{"name":"Department of Computer Science and Engineering, Shanghai Jiao Tong University 800 Dongchuan Road, Shanghai, 200240, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shengli","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering, Shanghai Jiao Tong University 800 Dongchuan Road, Shanghai, 200240, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Baodong","family":"Qin","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering, Shanghai Jiao Tong University 800 Dongchuan Road, Shanghai, 200240, China"},{"name":"College of Computer Science and Technology, Southwest University of Science and Technology 59 Qinglong Road, Mianyang, Sichuan, 621010, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kefei","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Science, Hangzhou Normal University 16 Xuelin Street, Xisha Higher Education Zone, Hangzhou, 310036, China"},{"name":"State Key Laboratory of Mathematical Engineering and Advanced Computing 30 Lianze Road, Building #18, Science and Education Industry Park, Binhu District,Wuxi, 214000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"37438","published-online":{"date-parts":[[2015,6,25]]},"container-title":["International Journal of Applied Mathematics and Computer Science"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/content.sciendo.com\/view\/journals\/amcs\/25\/2\/article-p415.xml","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.sciendo.com\/article\/10.1515\/amcs-2015-0032","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,5,15]],"date-time":"2024-05-15T22:56:46Z","timestamp":1715813806000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.sciendo.com\/article\/10.1515\/amcs-2015-0032"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,6,1]]},"references-count":0,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2015,6,25]]},"published-print":{"date-parts":[[2015,6,1]]}},"alternative-id":["10.1515\/amcs-2015-0032"],"URL":"https:\/\/doi.org\/10.1515\/amcs-2015-0032","relation":{},"ISSN":["2083-8492"],"issn-type":[{"value":"2083-8492","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,6,1]]}}}