A new distinguisher for clock controlled stream ciphers

Håkan Englund, Thomas Johansson

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper we present a distinguisher targeting towards irregularly clocked filter generators. The attack is applied on the irregularly. clocked stream cipher called LILI-II. LILI-II is the successor of the cipher LILI-128 and its design was published in [1]. There have been no known attacks better than exhaustive key search on LILI-II. Our attack is-the first of this kind that distinguishes the cipher output from a random source using 2(103) bits of keystream using computational complexity of approximately 2(103) operations.
Original languageEnglish
Pages (from-to)181-195
JournalLecture Notes in Computer Science
Volume3557
DOIs
Publication statusPublished - 2005

Subject classification (UKÄ)

  • Electrical Engineering, Electronic Engineering, Information Engineering

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