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Why might an attacker want to brute force attack a hash?
Because brute force attacking a hash is quicker than brute force attacking an encrypted password
All of these
Because passwords stored in authentication databases are often hashed for extra security
Because brute force attacking a hash takes less computing power than brute force attacking an encrypted password
Passwords stored in authentication databases are often hashed for extra security. If that database is penetrated by an attacker, they would still have to do a lot more work before they could retrieve usable passwords. There are a lot of different variables involved in how much time and how much processing power it takes to crack encrypted text or hashed text. One particular piece of hashed text could take more time and power to crack than one particular piece of encrypted text, and vice versa.
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