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ch3: sharpen our terminology, use "hash digest" by default

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Fixes #98
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Heiko Schaefer 2023-11-02 14:02:03 +01:00
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book/source/03-cryptography.md
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@ -8,12 +8,12 @@ SPDX-License-Identifier: CC-BY-SA-4.0
## Cryptographic hash functions
[Cryptographic hash functions](https://en.wikipedia.org/wiki/Cryptographic_hash_function) take data strings of any length (like a text message or file) and output a fixed-size code, often called a "hash" or "digest." This hash acts like a unique identifier for the original data.
[Cryptographic hash functions](https://en.wikipedia.org/wiki/Cryptographic_hash_function) take data strings of any length (like a text message or file) and output a fixed-size code, a "hash digest". Often abbreviated as either "digest" or "hash." A hash digest acts like a unique identifier for the original data.
Here are two important properties of cryptographic hash functions:
- ["Pre-image resistance"](https://en.wikipedia.org/wiki/Preimage_attack): Given a hash value, it should be very difficult to determine the original data it represents.
- ["Collision resistance"](https://en.wikipedia.org/wiki/Collision_resistance): It should be very difficult to find two distinct pieces of data that map to the same hash value.
- ["Pre-image resistance"](https://en.wikipedia.org/wiki/Preimage_attack): Given a hash digest, it should be very difficult to determine the original data it represents.
- ["Collision resistance"](https://en.wikipedia.org/wiki/Collision_resistance): It should be very difficult to find two distinct pieces of data that map to the same hash digest.
## Message authentication codes