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Paper 2013/726

Homomorphic Authenticated Encryption Secure Against Chosen-Ciphertext Attack

Chihong Joo and Aaram Yun

Abstract

We study homomorphic authenticated encryption, where privacy and authenticity of data are protected simultaneously. We define homomorphic versions of various security notions for privacy and authenticity, and investigate relations between them. In particular, we show that it is possible to give a natural definition of IND-CCA for homomorphic authenticated encryption, unlike the case of homomorphic encryption. Also, we construct a homomorphic authenticated encryption scheme supporting arithmetic circuits on $\ZZ_Q$ for smooth modulus $Q$, which is chosen-ciphertext secure both for privacy and authenticity. Our scheme is based on the error-free approximate GCD assumption.

Metadata
Available format(s)
PDF
Publication info
Preprint. MINOR revision.
Keywords
homomorphic authenticated encryptionhomomorphic MAChomomorphic encryption
Contact author(s)
aaramyun @ unist ac kr
History
2014-01-28: last of 4 revisions
2013-11-07: received
See all versions
Short URL
https://ia.cr/2013/726
License
Creative Commons Attribution
CC BY
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