CCIS Seminar - Tuesday 21 September 2010 - CTL
14:00:00 - Salle de CTL

Martin Gagné, University of Calgary

Threshold Attribute-Based Signcryption

Abstract: We propose a new threshold attribute-based signcryption scheme secure in the standard model. The scheme provides message con dentiality, and authenticity of a message in addition to attesting the attributes of the sender. Such a property is useful in applications such as electronic card, digital prescription carrier devices, secure and authentic email service, etc. Our scheme relies on the intractability of the hashed modifi ed decisional Diffe-Hellman and modified computational Diffe-Hellman assumptions, and is proven secure under adaptive chosen ciphertext attack and chosen message attack security notions of signcryption. Further, we achieve a tight reduction for both the security notions in the standard model.

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