An administrator wants to make password hashes more resistant to brute-force attacks by repeatedly applying a hashing algorithm multiple times. Which technique achieves this?
Steganography
Blockchain
Key stretching
Salting
Key stretching strengthens password hashes by applying a cryptographic hash function multiple times, increasing the computational effort required to crack the hash. This makes brute-force and rainbow table attacks more difficult. Salting adds random data to passwords before hashing but does not involve repeated hashing. Steganography hides data within other files and is unrelated to password hashing. Blockchain is a distributed ledger technology and does not enhance password hash security.
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