Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security

Jiang Weng, Yanjiang Yang, Qiang Tang, Robert H. Deng, Feng Bao

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    122 Downloads (Pure)

    Abstract

    Recently, a variant of proxy re-encryption, named conditional proxy re-encryption (C-PRE), has been introduced. Compared with traditional proxy re-encryption, C-PRE enables the delegator to implement fine-grained delegation of decryption rights, and thus is more useful in many applications. In this paper, based on a careful observation on the existing definitions and security notions for C-PRE, we reformalize more rigorous definition and security notions for C-PRE. We further propose a more efficient C-PRE scheme, and prove its chosenciphertext security under the decisional bilinear Diffie-Hellman (DBDH) assumption in the random oracle model. In addition, we point out that a recent C-PRE scheme fails to achieve the chosen-ciphertext security.
    Original languageUndefined
    Title of host publicationInformation Security - 12th International Conference, ISC, Pisa, Italy
    Place of PublicationHeidelberg
    PublisherSpringer
    Pages151-166
    Number of pages16
    ISBN (Print)978-3-642-04473-1
    DOIs
    Publication statusPublished - Sep 2009
    EventInformation Security - 12th International Conference, ISC, Pisa, Italy - Pisa, Italy
    Duration: 7 Sep 20099 Sep 2009

    Publication series

    NameLecture Notes in Computer Science
    PublisherSpringer Verlag
    Volume5735

    Conference

    ConferenceInformation Security - 12th International Conference, ISC, Pisa, Italy
    Period7/09/099/09/09
    OtherSeptember 7-9, 2009

    Keywords

    • METIS-264436
    • chosen-ciphertext security
    • Conditional proxy re-encryption
    • random oracle
    • SCS-Cybersecurity
    • EWI-16498
    • IR-68365

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