Wiktionary
dictionary attack
n. (context Internet English) An attack that uses a list of words (from a dictionary) to try and guess passwords or decryption keys
Wikipedia
Dictionary attack
In cryptanalysis and computer security, a dictionary attack is a technique for defeating a cipher or authentication mechanism by trying to determine its decryption key or passphrase by trying hundreds or sometimes millions of likely possibilities, such as words in a dictionary.
Usage examples of "dictionary attack".
You could also try a dictionary attack Once in, you can get at basically anything.
Annette wrinkles her brow: has to trigger a dictionary attack to parse the sentence.