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Keyed Hash Functions

br flag

What are keyed hash functions?

Why are they needed? I have never used a hash function which specifies the key so not getting the significance.

The key need not be secret. Why is it so?

Maarten Bodewes avatar
in flag
"The key need not be secret. Why is it so?" This is incorrect, for a keyed hash function they key needs to be secret. Private and (symmetric) secret keys always need to be secret, otherwise they would not qualify as keys.
SEJPM avatar
us flag
In what context did you encounter keyed hash functions? Because they _are_ used as a vehicle in cryptographic theory to model that we only have known a standard hash function for say 20 years.
Novice_researcher avatar
br flag
Yes, The answer helped me
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