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Information about Undeniable Signature

Undeniable signatures are a form of digital signature invented by David Chaum and Hans van Antwerpen in 1989. They have two distinctive features,
  1. The verification process is interactive, so the signer can limit who can verify their signature.
  2. A disavowal protocol, that is a cryptographic protocol which will allow them to prove that a given signature is a forgery.


The first means that a signer can allow only those who are authorized to access the document to verify their signature. If the document were to be leaked to a third party, the third party would be unable to verify that the signature is genuine.

However because of this property it means that the signer may deny a signature which was valid. To prevent this we have the second property, a method to prove that a given signature is a forgery.

See also

References

  • David Chaum, Hans van Antwerpen: Undeniable Signatures; Crypto'89, LNCS 435, Springer-Verlag, Berlin 1990, 212-216.
digital signature or digital signature scheme is a type of asymmetric cryptography used to simulate the security properties of a signature in digital, rather than written, form.
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David Chaum is the inventor of many cryptographic protocols and has contributed to the advancement of electronic cash. Chaum founded DigiCash in 1990, an electronic cash company.
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19th century - 20th century - 21st century
1950s  1960s  1970s  - 1980s -  1990s  2000s  2010s
1986 1987 1988 - 1989 - 1990 1991 1992

Year 1989 (MCMLXXXIX
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A security protocol (cryptographic protocol or encryption protocol) is an abstract or concrete protocol that performs a security-related function and applies cryptographic methods.

A protocol describes how the algorithms should be used.
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Criminal law
Part of the common law series
Elements of crimes
Actus reus  · Causation  · Concurrence
Mens rea  · Intention (general)
Intention in English law  · Recklessness
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This article is intended to be an 'analytic glossary', or alternatively, an organized collection of annotated pointers.

Classical ciphers

  • Autokey cipher
  • Permutation cipher
  • Polyalphabetic substitution
  • Vigenère cipher

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