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The Dragon stream cipher: Design, analysis and implementation issues

Dawson, Ed, Henricksen, Matthew, & Simpson, Leonie (2008) The Dragon stream cipher: Design, analysis and implementation issues. In Robshaw, M & OBillet, O (Eds.) New Stream Cipher Designs: The eSTREAM Finalists. Springer, Germany, Heidelberg, pp. 20-38.

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Abstract

Dragon is a word-based stream cipher. It was submitted to the eSTREAM project in 2005 and has advanced to Phase 3 of the software profile. This paper discusses the Dragon cipher from three perspectives: design, security analysis and implementation. The design of the cipher incorporates a single word-based non-linear feedback shift register and a non-linear filter function with memory. This state is initialized with 128- or 256-bit key-IV pairs. Each clock of the stream cipher produces 64 bits of keystream, using simple operations on 32-bit words. This provides the cipher with a high degree of efficiency in a wide variety of environments, making it highly competitive relative to other symmetric ciphers. The components of Dragon were designed to resist all known attacks. Although the design has been open to public scrutiny for several years, the only published attacks to date are distinguishing attacks which require keystream lengths greatly exceeding the stated 264 bit maximum permitted keystream length for a single key-IV pair.

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ID Code: 30485
Item Type: Book Chapter
Keywords: word based stream cipher, e-stream, encryption
DOI: 10.1007/978-3-540-68351-3_3
ISBN: 978-3-540-68350-6
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > DATA FORMAT (080400) > Data Encryption (080402)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Institutes > Information Security Institute
Deposited On: 12 Feb 2010 22:37
Last Modified: 18 Jul 2014 10:26

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