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CompTIA Security+ · CompTIA
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D. Salting The keyword here is "Random string of characters"
A vs D Key Stretching is when an input is when a hash is hashed several times Salting is when extra characters are added to the password before it's hashed
I had to look this one up, was guessing A Key Stretching at first. However: Key stretching is a cryptographic technique used to make password hashing more resistant to brute force and other password-cracking attacks by increasing the computational effort required to compute the hash. It transforms a user’s password (or a salted password) into a stronger cryptographic key through repeated iterations of a hashing algorithm, slowing down the process intentionally. Repeated iterations of hashing is not described in the scenario, simply adding additional random characters