Paper 2010/293
Security of balanced and unbalanced Feistel Schemes with Linear Non Equalities
Jacques Patarin
Abstract
\begin{abstract} In this paper we will study 2 security results ``above the birthday bound'' related to secret key cryptographic problems.\\ 1. The classical problem of the security of 4, 5, 6 rounds balanced Random Feistel Schemes.\\ 2. The problem of the security of unbalanced Feistel Schemes with contracting functions from $2n$ bits to $n$ bits. This problem was studied by Naor and Reingold~\cite{NR99} and by~\cite{YPL} with a proof of security up to the birthday bound.\\ These two problems are included here in the same paper since their analysis is closely related, as we will see. In problem 1 we will obtain security result very near the information bound (in $O(\frac {2^n}{n})$) with improved proofs and stronger explicit security bounds than previously known. In problem 2 we will cross the birthday bound of Naor and Reingold. For some of our proofs we will use~\cite{A2} submitted to Crypto 2010. \end{abstract}
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- Luby-Rackoff constructionsBalanced random Feistel schemesUnbalanced random Feistel schemesSecurity Proofs
- Contact author(s)
- valerie nachef @ u-cergy fr
- History
- 2010-05-18: received
- Short URL
- https://ia.cr/2010/293
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2010/293,
author = {Jacques Patarin},
title = {Security of balanced and unbalanced Feistel Schemes with Linear Non Equalities},
howpublished = {Cryptology {ePrint} Archive, Paper 2010/293},
year = {2010},
url = {https://eprint.iacr.org/2010/293}
}
