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More About Block Ciphers

  • Christof Paar
  • Jan Pelzl
Chapter

Abstract

A block cipher is much more than just an encryption algorithm. It can be used as a versatile building block with which a diverse set of cryptographic mechanisms can be realized. For instance, we can use them for building different types of blockbased encryption schemes, and we can even use block ciphers for realizing stream ciphers. The different ways of encryption are called modes of operation and are discussed in this chapter. Block ciphers can also be used for constructing hash functions, message authentication codes which are also knowns as MACs, or key establishment protocols, all of which will be described in later chapters. There are also other uses for block ciphers, e.g., as pseudo-random generators. In addition tomodes of operation, this chapter also discusses two very useful techniques for increasing the security of block ciphers, namely key whitening and multiple encryption.

Keywords

Block Cipher Initialization Vector Stream Cipher Message Authentication Code Cipher Block Chain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Department of Electrical Engineering and Information SciencesRuhr-Universität BochumBochumGermany
  2. 2.Zentrum für IT-Sicherheitescrypt GmbH — Embedded SecurityBochumGermany

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