Publication Type

Conference Proceeding Article

Version

publishedVersion

Publication Date

8-2021

Abstract

In this work we resolve the open problem raised by Prabhakaran and Rosulek at CRYPTO 2007, and present the first anonymous, rerandomizable, Replayable-CCA (RCCA) secure public-key encryption scheme. This solution opens the door to numerous privacy-oriented applications with a highly desired RCCA security level. At the core of our construction is a non-trivial extension of smooth projective hash functions (Cramer and Shoup, EUROCRYPT 2002), and a modular generic framework developed for constructing rerandomizable RCCA-secure encryption schemes with receiver-anonymity. The framework gives an enhanced abstraction of the original Prabhakaran and Rosulek’s scheme (which was the first construction of rerandomizable RCCA-secure encryption in the standard model), where the most crucial enhancement is the first realization of the desirable property of receiver-anonymity, essential to privacy settings. It also serves as a conceptually more intuitive and generic understanding of RCCA security, which leads, for example, to new implementations of the notion. Finally, note that (since CCA security is not applicable to the privacy applications motivating our work) the concrete results and the conceptual advancement presented here, seem to substantially expand the power and relevance of the notion of rerandomizable RCCA-secure encryption.

Keywords

RCCA security, Receiver-anonymity, Smooth projective hash function

Discipline

Information Security

Research Areas

Cybersecurity

Publication

Advances in Cryptology: CRYPTO 2021: 41st Annual International Cryptology Conference, Virtual, August 16-20: Proceedings

Volume

12828

First Page

270

Last Page

300

ISBN

9783030842581

Identifier

10.1007/978-3-030-84259-8_10

Publisher

Springer

City or Country

Cham

Additional URL

https://doi.org/10.1007/978-3-030-84259-8_10

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