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Hybrid Proxy Re-encryption Scheme for Attribute-Based Encryption

  • Takeo Mizuno
  • Hiroshi Doi
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6151)

Abstract

In ciphertext policy attribute based encryption (ABE) schemes the sender selects an access structure and generates a ciphertext, which decryptors can get plaintext if he has certain set of secret key associate with his attributes which satisfies the access structure. On the other hand, many organisations already introduced standard identity based encryption (IBE) or public key encryption (PKE) where only a single recipient is specified at the time of encryption. To utilize the above schemes and to simplify the management of user’s key, it is valuable to develop a proxy re-encryption schemes between ABE schemes and IBE schemes. In this paper we propose the first proxy re-encryption scheme, which can convert an ABE ciphertext to a ciphertext which is encrypted by IBE scheme. Using new proxy re-encryption scheme, some useful applications can be constructed. Furthermore, we prove the security in the standard model based on decisional bilinear Diffie-Hellman assumption.

Keywords

attribute-based encryption proxy re-encryption identity-based encryption bilinear maps 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Takeo Mizuno
    • 1
    • 2
  • Hiroshi Doi
    • 2
  1. 1.NTT DATA CORPORATIONTokyoJapan
  2. 2.INSTITUTE of INFORMATION SECURITYYokohama-shiJapan

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