Security and Privacy in Communication Networks. 9th International ICST Conference, SecureComm 2013, Sydney, NSW, Australia, September 25-28, 2013, Revised Selected Papers

Research Article

Generic Mediated Encryption

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  • @INPROCEEDINGS{10.1007/978-3-319-04283-1_10,
        author={Ibrahim Elashry and Yi Mu and Willy Susilo},
        title={Generic Mediated Encryption},
        proceedings={Security and Privacy in Communication Networks. 9th International ICST Conference, SecureComm 2013, Sydney, NSW, Australia, September 25-28, 2013, Revised Selected Papers},
        proceedings_a={SECURECOMM},
        year={2014},
        month={6},
        keywords={Key Revocation Problem Identity-based Encryption Double Encryption},
        doi={10.1007/978-3-319-04283-1_10}
    }
    
  • Ibrahim Elashry
    Yi Mu
    Willy Susilo
    Year: 2014
    Generic Mediated Encryption
    SECURECOMM
    Springer
    DOI: 10.1007/978-3-319-04283-1_10
Ibrahim Elashry1,*, Yi Mu1,*, Willy Susilo1,*
  • 1: University of Wollongong
*Contact email: ifeae231@uowmail.edu.au, ymu@uow.edu.au, wsusilo@uow.edu.au

Abstract

We propose a generic mediated encryption (GME) system that converts any identity based encryption (IBE) to a mediated IBE. This system is based on enveloping an IBE encrypted message using a user’s identity into another IBE envelope, using the identity of a security mediator (SEM) responsible for checking users for revocation. We present two security models based on the role of the adversary whether it is a revoked user or a hacked SEM. We prove that GME is as secure as the SEM’s IBE (the envelope) against a revoked user and as secure as the user’s IBE (the letter) against a hacked SEM. We also present two instantiations of GME. The first instantiation is based on the Boneh-Franklin (BF) FullIBE system, which is a pairing-based encryption system. The second instantiation is based on the Boneh, Gentry and Hamburg (BGH) system, which is a non pairing-based encryption system.