Proxy re-encryption is a cryptographic primitive developed to
delegate the decryption right from one party (the delegator) to
another (the delegatee). So far, no particular research efforts have
been devoted to this primitive in the inter-domain identity-based
setting, where the delegator and the delegatee are registered at
different domains. In this paper we analyze the trust relationships
and possible threats to the plaintexts of both the delegator and the
delegatee in this setting, and provide game-based semantic security
definitions. We propose a new inter-domain identity-based proxy
re-encryption scheme and prove its security in our security model.
An interesting property of our scheme is that, to achieve the chosen
plaintext security for the delegator, the delegatee's IBE only needs
to be one-way.
|Name||CTIT Technical Report Series|
|Publisher||University of Twente, Centre for Telematics and Information Technology (CTIT)|