Ciphertext-auditable public key encryption

Satoshi Hada, Kouichi Sakurai

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

2 被引用数 (Scopus)

抄録

Loss of backup tapes containing personal information (PI) is a potential breach of privacy and encryption is the typical way to prevent the breach. This paper considers an attack scenario where an adversary who encrypts the PI for backup purpose tries to hide the plain PI in a valid-looking ciphertext without being detected. We show that the standard security notion IND-CCA2 does not capture such a scenario. For example, the Cramer-Shoup scheme is vulnerable to such an attack. To capture such a scenario, we define a new notion of "ciphertext-auditability" as a new property of public key encryption schemes (PKESs). It requires that, given a public key and a ciphertext, anyone should be able to verify whether the ciphertext was actually generated using the public key. Also, it requires that, given a public key and a plaintext, no adversary should be able to generate a valid-looking ciphertext so that the verification passes, but nevertheless the plaintext can be recovered from the ciphertext without the corresponding secret key. We propose a general construction of such PKESs based on standard cryptographic primitives in the random oracle model.

本文言語英語
ホスト出版物のタイトルAdvances in Information and Computer Security - First International Workshop on Security, IWSEC 2006, Proceedings
出版社Springer Verlag
ページ308-321
ページ数14
ISBN(印刷版)3540476997, 9783540476993
出版ステータス出版済み - 2006
イベント1st International Workshop on Security, IWSEC 2006 - Kyoto, 日本
継続期間: 10 23 200610 24 2006

出版物シリーズ

名前Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
4266 LNCS
ISSN(印刷版)0302-9743
ISSN(電子版)1611-3349

その他

その他1st International Workshop on Security, IWSEC 2006
Country日本
CityKyoto
Period10/23/0610/24/06

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • Computer Science(all)

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