[Resource Topic] 2007/074: A Cramer-Shoup Encryption Scheme from the Linear Assumption and from Progressively Weaker Linear Variants

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Title:
A Cramer-Shoup Encryption Scheme from the Linear Assumption and from Progressively Weaker Linear Variants

Authors: Hovav Shacham

Abstract:

We describe a CCA-secure public-key encryption scheme, in the Cramer-Shoup paradigm, based on the Linear assumption of Boneh, Boyen, and Shacham. Through a comparison to the Kiltz tag-encryption scheme from TCC 2006, our scheme gives evidence that the Cramer-Shoup paradigm yields CCA encryption with shorter ciphertexts than the Canetti-Halevi-Katz paradigm. We present a generalization of the Linear assumption into a family of progressively weaker assumptions and show how to instantiate our Linear Cramer-Shoup encryption using the progressively weaker members of this family.

ePrint: https://eprint.iacr.org/2007/074

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