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International Symposium on Algorithms and Computation

ISAAC 1997: Algorithms and Computation pp 253–262Cite as

Homophonic coding with logarithmic memory size

  • Session 5B
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Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 1350))

Abstract

Homophonic coding, introduced in [1, 2], is refered to as a means of constructing unbreakable secret-key cipher systems. In [3] a homophonic coding method has been proposed that provides arbitrarily small redundancy r with the size of memory and computation time growing as O(1/r) and O(log2 1/r log log 1/r), respectively, as r → 0, not more than 4r random bits being used on average. In the present paper, we suggest a method for which the memory size and computation time grow as O(log 1/r) and O(log 1/r log log 1/r log log log 1/r), respectively, as r → 0, the average number of random bits being approx. 2 + r. We also propose a homophonic coding scheme which meets both specified redundancy and a number of random bits.

Supported by Russian Foundation of Fundamental Research under Grant 96-0100052

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References

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Author information

Authors and Affiliations

  1. Novosibirsk Telecommunication Institute, Kirov str. 86, 630102, Novosibirsk, Russia

    Boris Ryabko & Andrey Fionov

Authors
  1. Boris Ryabko
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  2. Andrey Fionov
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Editor information

Hon Wai Leong Hiroshi Imai Sanjay Jain

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© 1997 Springer-Verlag Berlin Heidelberg

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Ryabko, B., Fionov, A. (1997). Homophonic coding with logarithmic memory size. In: Leong, H.W., Imai, H., Jain, S. (eds) Algorithms and Computation. ISAAC 1997. Lecture Notes in Computer Science, vol 1350. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-63890-3_28

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  • DOI: https://doi.org/10.1007/3-540-63890-3_28

  • Published:

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-63890-2

  • Online ISBN: 978-3-540-69662-9

  • eBook Packages: Springer Book Archive

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