Obsahuje:
  • všechny e-ziny od 9/1999
  • celou databázi NEWS
  • soutěže 2000-2011
  • další články a BONUSY

Security - News

http://crypto-world.info

Crypto - News | Security - News

01 / 2005
Vybrali pro vás: TR - Tomáš Rosa, JP - Jaroslav Pinkava, PV - Pavel Vondruška, VK - Vlastimil Klíma

Do archívu IACR p?ijat ?lánek ?eského kryptologa v?novaný útoku na šifru Hiji-bij-bij ...

10.01.2005

P?ísp?vek ?ekého kryptologa Vlastimila Klímy - Útoky na šifru Hiji-bij-bij, který vzbudil zaslouženou pozornost na mezinárodním workshopu MKB byl p?ijat do archívu IACR (International Association for Cryptologic Research).

Cryptology ePrint Archive: Report 2005/003
Cryptanalysis of Hiji-bij-bij (HBB)
Vlastimil Klima
Abstract. In this paper, we show several known-plaintext attacks on the stream cipher HBB which was proposed recently at INDOCRYPT 2003. The cipher can operate either as a classical stream cipher (in the B mode) or as an asynchronous stream cipher (in the SS mode). In the case of the SS mode, we present known-plaintext attacks recovering 128-bit key with the complexity 2^66 and 256-bit key with the complexity 2^67. In the case of B mode with 256-bit key, we show a known-plaintext attack recovering the whole plaintext with the complexity 2^140. All attacks need only a small part of the plaintext to be known.

Category / Keywords. secret-key cryptography / cryptanalysis, Hiji-bij-bij, HBB, stream ciphers, synchronous cipher, asynchronous cipher, equivalent keys, known-plaintext attack

Date: received 5 Jan 2005

Zdroj: http://eprint.iacr.org/2005/003
Autor: PV


<<- novější - Podniková sí? a Internet - bezpe?n?ji pro zam?stnance
První pohled: Boj se spyware podle Microsoftu - starší ->>
Design: Webdesign