In this paper, we first construct a security model for delegation-by-warrant ID-based proxy Signcryption schemes and formalize notions of security for them. To the best of our knowledge, no related work has been done. Then we present such a scheme based on the bilinear pairings, and show that it is provably secure in the random oracle model. Specifically, we prove its semantic security under the DBDH assumption and its unforgeability under the BDH assumption.
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