CTL
21 September 2010 - 14h00
Threshold Attribute-Based Signcryption
by Martin Gagné from University of Calgary
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.
