Improved Key Recovery Attack on the BEAN Stream Cipher
Författare
Summary, in English
BEAN is a newly proposed lightweight stream cipher adopting Fibonacci FCSRs. It is designed for very constrained environments and aims at providing a balance between security, efficiency and cost. A weakness in BEAN was first found by Ågren and Hell in 2011, resulting in a key recovery attack slightly better than brute force. In this paper, we present new correlations between state and keystream with large statistical advantage, leading to a much more efficient key recovery attack. The time and data complexities of this attack are 2^57.53 and 2^59.94, respectively. Moreover, two new output functions are provided as alternatives, which are more efficent than the function used in BEAN and are immune to all attacks proposed on the cipher. Also, suggestions for improving the FCSRs are given.
Avdelning/ar
Publiceringsår
2013
Språk
Engelska
Sidor
1437-1444
Publikation/Tidskrift/Serie
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Volym
E96A
Issue
6
Dokumenttyp
Artikel i tidskrift
Förlag
IEICE
Ämne
- Electrical Engineering, Electronic Engineering, Information Engineering
Nyckelord
- Stream cipher
- key recovery attack
- FCSR
- BEAN.
Status
Published
Forskningsgrupp
- Crypto and Security
ISBN/ISSN/Övrigt
- ISSN: 0916-8508