Skip to Main content Skip to Navigation
Conference papers

Improving the Performance of the SYND Stream Cipher

Abstract : . In 2007, Gaborit et al. proposed the stream cipher SYND as an improvement of the pseudo random number generator due to Fischer and Stern. This work shows how to improve considerably the e ciency the SYND cipher without using the so-called regular encoding and without compromising the security of the modi ed SYND stream cipher. Our proposal, called XSYND, uses a generic state transformation which is reducible to the Regular Syndrome Decoding problem (RSD), but has better computational characteristics than the regular encoding. A rst implementation shows that XSYND runs much faster than SYND for a comparative security level (being more than three times faster for a security level of 128 bits, and more than 6 times faster for 400-bit security), though it is still only half as fast as AES in counter mode. Parallel computation may yet improve the speed of our proposal, and we leave it as future research to improve the e ciency of our implementation.
Document type :
Conference papers
Complete list of metadata

Cited literature [29 references]  Display  Hide  Download
Contributor : Pierre-Louis Cayrel Connect in order to contact the contributor
Submitted on : Tuesday, September 24, 2013 - 3:14:49 PM
Last modification on : Wednesday, September 7, 2022 - 3:36:04 PM
Long-term archiving on: : Wednesday, December 25, 2013 - 4:39:24 AM


Files produced by the author(s)


  • HAL Id : ujm-00865533, version 1



Mohammed Meziani, Gerhard Hoffmann, Pierre-Louis Cayrel. Improving the Performance of the SYND Stream Cipher. Africacrypt 2012, Jun 2012, Morocco. pp.99-116. ⟨ujm-00865533⟩



Record views


Files downloads