Such an attack might be used when it is not possible to take advantage of other weaknesses in an encryption system (if any exist) that would make the task easier. This is known as an exhaustive key search.Ī brute-force attack is a cryptanalytic attack that can, in theory, be used to attempt to decrypt any encrypted data (except for data encrypted in an information-theoretically secure manner). Alternatively, the attacker can attempt to guess the key which is typically created from the password using a key derivation function. The attacker systematically checks all possible passwords and passphrases until the correct one is found. In cryptography, a brute-force attack consists of an attacker submitting many passwords or passphrases with the hope of eventually guessing correctly. The photograph shows a DES Cracker circuit board fitted with 64 Deep Crack chips using both sides. The Electronic Frontier Foundation's US$250,000 DES cracking machine contained over 1,800 custom chips and could brute-force a DES key in a matter of days.
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