CryptographyAdvanced
Preimage resistance
The difficulty of finding an input that produces a specified cryptographic hash output.
PLAIN-ENGLISH DEFINITION
In more detail
Given a digest, an attacker should not be able to efficiently work backward to a matching input. They can still guess inputs and hash each guess. This is why a predictable password stays vulnerable to guessing even when a system stores only its hash.
IN THE WILD
How you might use it
"I hashed a predictable word, so it must be secret now." Someone can still hash likely guesses and look for the match.
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