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Which of the following describes an 'offline dictionary attack' against passwords?Group of answer choicesThe attacker targets a specific account and submits password guesses until the correct password is discoveredThe attacker waits until a logged-in workstation is unattended.The attacker compares the password hashes against hashes of commonly used passwords.The attacker attempts to gain knowledge about the account holder and system password policies and uses that knowledge to guess the password

Question

Which of the following describes an 'offline dictionary attack' against passwords?Group of answer choicesThe attacker targets a specific account and submits password guesses until the correct password is discoveredThe attacker waits until a logged-in workstation is unattended.The attacker compares the password hashes against hashes of commonly used passwords.The attacker attempts to gain knowledge about the account holder and system password policies and uses that knowledge to guess the password

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Solution 1

An 'offline dictionary attack' against passwords

Solution 2

An 'offline dictionary attack' against passwords is described as: The attacker compares the password hashes against hashes of commonly used passwords.

In this type of attack, the attacker has somehow obtained the file where the hashed or encrypted versions of all the users' passwords are stored. They then use a precomputed dictionary where each word has a hash counterpart. The attacker compares these precomputed hashes with the ones in the stolen passwords file. If a match is found, the password has been cracked. This is why it's called a 'dictionary' attack - the attacker is essentially comparing the hashed passwords against a 'dictionary' of hashed common words or passwords.

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