Scott has discovered that an attacker is attempting to get network passwords by using software that attempts a number of passwords from a list of common passwords. Which of the following types of attack is this?

Dictionary attacks use a list of words that are believed to be likely passwords. A rainbow table is a precomputed table of hashes. Brute force tries every possible random combination. If an attacker has the original plaintext and ciphertext for a message, they can determine the keyspace used through brute-force attempts targeting the keyspace. Session hijacking is when the attacker takes over an authenticated session.