Cryptology ePrint Archive: Report 2013/630

Estimating Key Sizes For High Dimensional Lattice Based Systems

Joop van de Pol and Nigel P. Smart

Abstract: We revisit the estimation of parameters for use in applications of the BGV homomorphic encryption system, which generally require high dimensional lattices. In particular, we utilize the BKZ-2.0 simulator of Chen and Nguyen to identify the best lattice attack that can be mounted using BKZ in a given dimension at a given security level. Using this technique, we show that it should be possible to work with lattices of smaller dimensions than previous methods have recommended, while still maintaining reasonable levels of security. As example applications we look at the evaluation of AES via FHE operations presented at Crypto 2012, and the parameters for the SHE variant of BGV used in the SPDZ protocol from Crypto 2012.

Category / Keywords: public-key cryptography / lattice techniques,cryptanalysis,bkz

Original Publication (with minor differences): IMA International Conference on Cryptography and Coding

Date: received 30 Sep 2013, last revised 30 Sep 2013

Contact author: joop vandepol at bristol ac uk

Available format(s): PDF | BibTeX Citation

Version: 20130930:171123 (All versions of this report)

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