CyberGuard dictionary / Cryptography
Cryptographic Hash
A fixed-length digest produced from input data by a cryptographic hash function.
In simple terms
A hash is a compact fingerprint of data, though different data can theoretically produce the same value.
Technical explanation
Secure hash functions resist finding inputs with the same digest and are used in integrity checks, signatures, and password storage schemes.
A digest can reveal whether data changed, but it does not establish who published the expected digest. Password storage needs slow, salted password-hashing schemes rather than a fast general-purpose hash alone.
Examples in practice
A software vendor publishes a SHA-256 digest so a customer can check that a download was not changed.
The customer downloads a program and compares its digest with one obtained from the vendor's authenticated release page. A matching value supports file integrity, while the trusted page supplies the expected reference.
Why it matters
A plain fast hash is not enough to store passwords safely; password hashing needs a dedicated slow, salted scheme.
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Sources and further reading
Published 2026-10-15 · Last updated 2026-10-15 · CyberGuard editorial content. Source links provide context; they do not imply endorsement.