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Encyclopedia of Cryptography and Security pp 1175–1176Cite as

Self-Synchronizing Stream Cipher

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Synonyms

Asynchronous stream cipher

Related Concepts

Stream Cipher

Definition

In a self-synchronizing, or asynchronous, stream cipher, the keystream depends on the secret key of the scheme, but also of a fixed number, say t, of ciphertext digits (that have already been produced, or read; this distinguishes it from a synchronous stream cipher).

Background

The idea of self-synchronization was patented in 1946 and has the advantage that the receiver will automatically synchronize with the keystream generator after receiving t ciphertext digits.

Example

A simple example of a self-synchronizing stream cipher is a block cipher in cipher-feedback mode (CFB).

Theory

A self-synchronizing stream cipher can be viewed as depicted in Fig. 1.

Self-Synchronizing Stream Cipher. Fig. 1
figure 1_371

Self-synchronizing stream cipher

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Self-Synchronizing Stream Cipher. Fig. 1

Recommended Reading

  1. Rueppel RA (1986) Analysis and design of stream ciphers. Springer, Berlin

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  2. Maurer UM (1991) New approaches to the design of self-synchronizing stream ciphers. Advances in Cryptology – Eurocrypt’91. Lecture notes in computer science, vol 547. Springer, pp 458–471

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  3. Daemen J, Govaerts R, Vandewalle J (1992) On the design of high speed self-synchronizing stream ciphers. Singapore ICCS-ISITA’92 conference proceedings, pp 279–283

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  4. Guillot P, Mesnager S (2005) Non-linearity and security of self synchronizing stream ciphers. 2005 International symposium on nonlinear theory and its applications, Belgium, 18–21 Oct 2005

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  5. Daemen J, Kitsos P (2008) The self-synchronizing stream cipher moustique, new stream cipher designs. Lecture notes in computer science, vol 4986. Springer, pp 210–223

    Google Scholar 

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Author information

Authors and Affiliations

  1. Lab-STICC/CID and Telecom Bretagne/ITI, CNRS/Lab-STICC/CID and Telecom Bretagne, Technopole Brest Iroise, CS 83818, 29238, Brest cedex 3, France

    Caroline Fontaine (Dr.)

Authors
  1. Caroline Fontaine
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Editor information

Editors and Affiliations

  1. Department of Mathematics and Computing Science, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands

    Henk C. A. van Tilborg

  2. Center for Secure Information Systems, George Mason University, Fairfax, VA, 22030-4422, USA

    Sushil Jajodia

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Fontaine, C. (2011). Self-Synchronizing Stream Cipher. In: van Tilborg, H.C.A., Jajodia, S. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5906-5_371

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