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A Generic Method for Reducing Ciphertext Length of Reproducible KEMs in the RO Model

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Advances in Information and Computer Security (IWSEC 2010)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 6434))

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Abstract

In this paper, a simple generic method is proposed which can make a key encapsulation mechanism (KEM) more efficient. While the original KEM needs to be OW-CCCA secure and to satisfy reproducibility, the transformed KEM is CCA secure in the random oracle model and the size of ciphertexts is shorter. In particular, various existing CCA secure KEMs in the standard model can be transformed into more efficient ones in the random oracle model. We can implement both the original KEM and the transformed one in a single chip simultaneously with a small number of additional gates because our transformation requires computing a single hash value only.

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Author information

Authors and Affiliations

  1. The University of Electro-Communications, Japan

    Yusuke Sakai & Kazuo Ohta

  2. National Institute of Advanced Industrial Science and Technology, Japan

    Goichiro Hanaoka

  3. Ibaraki University, Japan

    Kaoru Kurosawa

Authors
  1. Yusuke Sakai
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  2. Goichiro Hanaoka
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  3. Kaoru Kurosawa
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  4. Kazuo Ohta
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Editor information

Editors and Affiliations

  1. National Institute of Informatics, 2-1-2 Hitotsubashi, 101-8430, Chiyoda-ku, Tokyo, Japan

    Isao Echizen

  2. School of Frontier Sciences, Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Chiba, Japan

    Noboru Kunihiro

  3. School of Science and Technology for Future Life, Department of Information Systems and Multi Media, Tokyo Denki University, 2-2 Kanda-Nishiki-cho, 101-8457, Chiyoda-ku, Tokyo, Japan

    Ryoichi Sasaki

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Sakai, Y., Hanaoka, G., Kurosawa, K., Ohta, K. (2010). A Generic Method for Reducing Ciphertext Length of Reproducible KEMs in the RO Model. In: Echizen, I., Kunihiro, N., Sasaki, R. (eds) Advances in Information and Computer Security. IWSEC 2010. Lecture Notes in Computer Science, vol 6434. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16825-3_5

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  • DOI: https://doi.org/10.1007/978-3-642-16825-3_5

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-16824-6

  • Online ISBN: 978-3-642-16825-3

  • eBook Packages: Computer ScienceComputer Science (R0)

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