Key-Insulated Public Key Encryption with Auxiliary Helper Key : Model, Constructions and Formal Security Proofs(<Special Section>Information Theory and Its Applications)

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概要

• 論文の詳細を見る

• To deal with the problem of secret key exposure, Dodis, Katz, Xu and Yung proposed a key-insulated public key encryption (KIE), which uses the secure helper key to update the secret key more often and helps to minimize the damage overall. We take this idea further in improving the helper key security by introducing an auxiliary helper key besides of the main helper key. The auxiliary helper key is used less than the main helper key and can help the system to reduce the damage even in case of helper key exposure. This paper give two different schemes of KIE with auxiliary helper key. There are trade-offs between public key length and ciphertext size, as well as between encryption algorithms and decryption algorithms in these two schemes. With these trade-offs, it is flexible to choose an efficient one to implement in reality. We also show concrete constructions with chosen-ciphertext security. The formal security proofs for all schemes are given in this paper, based on the CBDH assumption in the random oracle model.

• 社団法人電子情報通信学会の論文
• 2007-09-01

著者

• IMAI Hideki

  Chuo University

• Imai H

  National Inst. Of Advanced Industrial Sci. And Technol. Tokyo Jpn

• Imai Hideki

  Faculty Of Science And Engineering Chuo University:research Center For Information Security (rcis) N

• HANAOKA Goichiro

  National Institute of Advanced Industrial Science and Technology

• IMAI Hideki

  National Institute of Advanced Industrial Science and Technology

• Phan Thi

  Department Of Informatics And Electronics Institute Of Industrial Science The 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

• Imai Hideki

  National Inst. Of Advanced Industrial Sci. & Technol. (aist) Tokyo Jpn

• MATSUURA Kanta

  Department of Informatics and Electronics, Institute of Industrial Science, The University of Tokyo

• Matsuura Kanta

  Univ. Tokyo Tokyo Jpn

• Hanaoka G

  National Institute Of Advanced Industrial Science And Technology

• Hanaoka Goichiro

  National Inst. Of Advanced Industrial Sci. And Technol. Tokyo Jpn

• Imai Hideki

  National Inst. Advanced Industrial Sci. And Technol. Tokyo Jpn

• Imai Hideki

  National Astronomical Observatory

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