īrute-force attacks are an application of brute-force search, the general problem-solving technique of enumerating all candidates and checking each one.
One of the measures of the strength of an encryption system is how long it would theoretically take an attacker to mount a successful brute-force attack against it.
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īrute-force attacks can be made less effective by obfuscating the data to be encoded making it more difficult for an attacker to recognize when the code has been cracked or by making the attacker do more work to test each guess. Longer passwords, passphrases and keys have more possible values, making them exponentially more difficult to crack than shorter ones. When password-guessing, this method is very fast when used to check all short passwords, but for longer passwords other methods such as the dictionary attack are used because a brute-force search takes too long. 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.
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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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