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International Workshop on Public Key Cryptography

PKC 2007: Public Key Cryptography – PKC 2007 pp 298–314Cite as

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  2. Public Key Cryptography – PKC 2007
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Parallel Key-Insulated Public Key Encryption Without Random Oracles

Parallel Key-Insulated Public Key Encryption Without Random Oracles

  • Benoît Libert1,
  • Jean-Jacques Quisquater1 &
  • Moti Yung2 
  • Conference paper

  • 2078 Accesses

  • 17 Citations

Part of the Lecture Notes in Computer Science book series (LNSC,volume 4450)

Abstract

Key-insulated cryptography is a crucial technique for protecting private keys. To strengthen the security of key-insulated protocols, Hanaoka, Hanaoka and Imai recently introduced the idea of parallel key-insulated encryption (PKIE) where distinct physically-secure devices (called helpers) are independently used in key updates. Their motivation was to reduce the risk of exposure for helpers by decreasing the frequency of their connections to insecure environments. Hanaoka et al. showed that it was non-trivial to achieve a PKIE scheme fitting their model and proposed a construction based on the Boneh-Franklin identity-based encryption (IBE) scheme. The security of their system was only analyzed in the idealized random oracle model. In this paper, we provide a fairly efficient scheme which is secure in the standard model (i.e. without random oracles). To do so, we first show the existence of a relation between PKIE and the notion of aggregate signatures (AS) suggested by Boneh et al. We then describe our random oracle-free construction using bilinear maps. Thus, our contributions are both on the concrete side, namely the first realization of parallel key-insulated encryption without the random oracle idealization, and on the conceptual side revealing the relationships between two seemingly unrelated primitives.

Keywords

  • parallel key-insulated encryption
  • standard model
  • pairings

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Author information

Authors and Affiliations

  1. UCL, Microelectronics Laboratory, Crypto Group, Belgium

    Benoît Libert & Jean-Jacques Quisquater

  2. RSA Labs and Columbia University, USA

    Moti Yung

Authors
  1. Benoît Libert
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  2. Jean-Jacques Quisquater
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  3. Moti Yung
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Tatsuaki Okamoto Xiaoyun Wang

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Libert, B., Quisquater, JJ., Yung, M. (2007). Parallel Key-Insulated Public Key Encryption Without Random Oracles. In: Okamoto, T., Wang, X. (eds) Public Key Cryptography – PKC 2007. PKC 2007. Lecture Notes in Computer Science, vol 4450. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71677-8_20

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