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7 - Digital signatures

Stephen Mason
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Summary

Technical overview of digital signatures

Cryptography is the method of hiding the contents of a message, used from ancient times to the present. Encryption (or enciphering) is the process by which a plaintext (or cleartext) message is disguised sufficiently to hide the substance of the content. As well as ordinary text, a plaintext message can be a stream of binary digits, a text file, a bitmap, a recording of sound in digital format, audio images of a video or film and any other information formed into digital bits. When a message has been encrypted, it is known as ciphertext or a cryptogram. The opposite procedure, that of turning the ciphertext back into plaintext, is called decryption (or deciphering). In essence, contemporary cryptographic systems change one set of symbols that have meaning (binary data) into a second set of symbols that has no meaning, by means of a mathematical process. Cryptography is usually required to undertake a number of functions, the most important of which is authenticity, rather than secrecy. These functions are discussed below.

Authenticity

To ensure the authenticity of the information. When sending or receiving information or placing an order, both parties need to have assurance of the origin of the message. The aim is to corroborate the identity of the entity that sent the data, such as the computer (the identity of a person cannot be corroborated, because a person is not part of the communications process – the process only involves computers).

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Publisher: Cambridge University Press
Print publication year: 2012

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  • Digital signatures
  • Stephen Mason
  • Book: Electronic Signatures in Law
  • Online publication: 05 March 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9780511998058.008
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  • Digital signatures
  • Stephen Mason
  • Book: Electronic Signatures in Law
  • Online publication: 05 March 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9780511998058.008
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Digital signatures
  • Stephen Mason
  • Book: Electronic Signatures in Law
  • Online publication: 05 March 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9780511998058.008
Available formats
×