For symmetric-key ciphers, a brute force attack typically means a brute-force search of the key space; that is, testing all possible keys in order to recover theplaintext used to produce a particular ciphertext.

In a brute force attack, the expected number of trials before the correct key is found is equal to half the size of the key space. For example, if there are 2⁶⁴ possible keys, a brute force attack would, on average, be expected to find a key after 2⁶³ trials.

For each trial of a candidate key the attacker needs to be able to recognize when he has found the correct key. The most straightforward way is to obtain a few corresponding plaintext and ciphertext pairs, that is, aknown-plaintext attack or crib. Alternatively, a ciphertext-only attack is possible by decrypting ciphertext using each candidate key, and testing the result for similarity to plaintext language—for example, Englishencoded in ASCII.

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