According to the "Handbook of Applied Cryptography"

Cryptography is the study of mathematical techniques related to aspects of information security such as confidentiality, data integrity, entity authentication, and data origin authentication.

My questions are: Why not appear non-repudiation in that definition? Is it less important? Is the non-repudiation not part of aspects of information security?

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    $\begingroup$ The list of properties is introduced with "such as".. this suggests that the list is not intended to be exhaustive. $\endgroup$ – Mikero Jun 18 '18 at 2:39

That is clearly a simplified definition, as cryptography encompasses a large number of ideas. It is likely for the same reason that they do not mention zero-knowledge proofs or proof-of-work systems, despite those very often falling squarely in the relm of cryptography.

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