Journal of information and communication convergence engineering

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Attribute-based Proxy Re-encryption with a Constant Number of Pairing Operations

  • Seo, Hwa-Jeong (Department of Computer Engineering, Pusan National University) ;
  • Kim, Ho-Won (Department of Computer Engineering, Pusan National University)
  • Received : 2011.09.23
  • Accepted : 2011.11.14
  • Published : 2012.03.31
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Abstract

Attribute-based encryption (ABE) is an encryption scheme in which the user is able to decrypt a ciphertext with associated attributes. However, the scheme does not offer the capability of decryption to others when the user is offline. For this reason, the attribute-based proxy re-encryption (ABPRE) scheme was proposed, which combines traditional proxy re-encryption with ABE, so a user is able to empower designated users to decrypt the re-encrypted ciphertext with the associated attributes of designated users. However, previous ABPRE schemes demands a number of pairing operations that imply huge computational overhead. To reduce the number of pairing operations, we reduce the pairing operations with exponent operations. This paper provides a novel approach to an ABPRE scheme with constant pairing operation latency.

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