Information-Theoretically Secure Key Insulated Encryption : Models, Bounds and Constructions(Cryptography and Information Security)(<Special Section>Information Theory and Its Applications)

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概要

• 論文の詳細を見る

• Computer systems are constantly under attack and ille gal access is a constant threat which makes security even more critical. A system can be broken into and secret information, e.g. decryption key, may be exposed, resulting in a total break of the system. Recently, a new framework for the protection against such key exposure problem was suggested and was called, Key-Insulated Encryption (KIE). In our paper, we introduce a novel approach to key insulated cryptosystems that offers provable security without computational assumptions. For the model of Information-Theoretically Secure Key-Insulated Encryption (ISKIE), we show lower bounds on required memory sizes of user, trusted device and sender. Our bounds are all tight as our concrete construction of ISKIE achieves all the bounds. We also extend this concept further by adding an extra property so that any pair of users in the system is able to communi cate with each other and still have the same security benefits as the existing KIE based on intractability assumptions. We called this, Dynamic and Mu tual Key-Insulated Encryption (DMKIE), and concrete implementations of DMKIE will be shown as well. In the end, we discuss the relationship of DMKIE against Key Predistribution Schemes (KPS) and Broadcast En cryption Schemes (BBS), that is, we show that DMKIE can be constructed from either KPS or BBS.

• 社団法人電子情報通信学会の論文
• 2004-10-01

著者

• SHIKATA Junji

  Graduate School of Environment and Information Sciences, Yokohama National University

• IMAI Hideki

  3rd Department, Institute of Industrial Science, University of Tokyo

• Hanaoka Goichiro

  Research Center For Information Security (rcis) National Institute Of Advanced Industrial Science &a

• Hanaoka Goichiro

  Institute Of Industrial Science The University Of Tokyo

• Hanaoka Goichiro

  3rd Department Institute Of Industrial Science The University Of Tokyo

• Shikata Junji

  Graduate School Of Environment And Information Sciences Yokohama National University

• Imai H

  Research Center For Information Security (rcis) National Institute Of Advanced Industrial Science An

• Imai Hideki

  3rd Department Institute Of Industrial Science The University Of Tokyo

• Shikata J

  The Graduate School Of Environment And Information Sciences Yokohama National University

• Hanaoka G

  National Institute Of Advanced Industrial Science And Technology

• HANAOKA Yumiko

  NTT DoCoMo, Inc.

• HANAOKA Yumiko

  Security Systems Group, Network Management Development Department, NTT DoCoMo

• Hanaoka Yumiko

  Security Systems Group Network Management Development Department Ntt Docomo

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