Identity-Based Cryptosystem PrivacyReport
Identity-based cryptosystems (IBCs) rely on the use of a private key generator (PKG), which maintains a master secret. This master secret allows the PKG to produce the private key for any identity under its authority. Distrustful groups may wish to maintain distinct PKGs and master secrets to avoid reliance on external entities. IBC privacy is the property that an adversary can gain no more than a negligible advantage in distinguishing between encrypted messages destined for users under multiple distinct cryptosystems. This paper formalizes the notion of IBC privacy and, through modification of key-privacy proofs by Abdalla et al., demonstrates that the Boneh-Franklin identity-based encryption scheme offers the IBC privacy property given agreement on certain system parameters.
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Calandrino, Joseph, and Alfred Weaver. "Identity-Based Cryptosystem Privacy." University of Virginia Dept. of Computer Science Tech Report (2006).
University of Virginia, Department of Computer Science