Digital signatures

Stephen Mason

doi:10.1017/CBO9780511998058.008

7 - Digital signatures

Published online by Cambridge University Press: 05 March 2012

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).

Type: Chapter
Information: Electronic Signatures in Law , pp. 259 - 302

DOI: https://doi.org/10.1017/CBO9780511998058.008 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2012

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7 - Digital signatures

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