# Information Security and Cryptography Research Group

## Generating Shorter Bases for Hard Random Lattices

### Joël Alwen and Chris Peikert

Theory Comput. Syst., vol. 48, no. 3, pp. 535-553, 2011.

We revisit the problem of generating a hard random lattice together with a basis of relatively short vectors. This problem has gained in importance lately due to new cryptographic schemes that use such a procedure to generate public/secret key pairs. In these applications, a shorter basis corresponds to milder underlying complexity assumptions and smaller key sizes.

The contributions of this work are twofold. First, we simplify and modularize an approach originally due to Ajtai (ICALP 1999). Second, we improve the construction and its analysis in several ways, most notably by making the output basis asymptotically as short as possible.

## BibTeX Citation

@article{AP11,
author       = {Joël Alwen and Chris Peikert},
title        = {Generating Shorter Bases for Hard Random Lattices},
journal      = {Theory Comput. Syst.},
pages        = 535-553,
number       = 3,
volume       = 48,
year         = 2011,
}