Digital Signatures

Chapter

Abstract

One of the main goals of modern cryptography is to guarantee the authenticity and the integrity of the messages received, which is of the utmost importance in fields like ecomerce and e-banking, where physical protection of exchanged data is impossible. A reasonable guarantee of data authenticity in the private-key setting can be obtained by using a MAC. However, the requirement that the parties share a secret key severely limits the applicability of these schemes and, moreover, MACs do not provide non-repudiation and allow the possibility that the sender of an authenticated message might later repudiate it. These problems are solved with the use of digital signatures, that serve to guarantee authenticity in the public-key setting, and are studied in this chapter.

Keywords

Hash Function Signature Scheme Random Oracle Blind Signature Random Oracle Model 
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.

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Departamento de AlxebraUniversidade de SantiagoSantiago de CompostelaSpain

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