"A brute force attack attempts to defeat a cryptographic algorithm by trying a large number of possibilities. A brute force attack on a cipher might include trying a large number of keys in the key space to decrypt a message. Brute force attack is the most inefficient method of attacking a cipher, and most cryptanalysis is concerned with finding more efficient means of defeating ciphers." (Michael Coles & Rodney Landrum, , "Expert SQL Server 2008 Encryption", 2008)
"An attack on an encryption algorithm in which the encryption key for ciphertext is determined by trying to decrypt with every key until valid plaintext is obtained." (Mark S Merkow & Lakshmikanth Raghavan, "Secure and Resilient Software Development", 2010)
"A method used for breaking encryption systems. Brute-force methodology entails trying all the possible keys until the proper one is found." (Mark Rhodes-Ousley, "Information Security: The Complete Reference" 2nd Ed., 2013)
"A method by which a hacker tries to gain access to an account on the target system by trying to “guess” the correct password." ( Manish Agrawal, "Information Security and IT Risk Management", 2014)
"Involves programs designed to guess at every possible combination until the password or key is cracked." (Mike Harwood, "Internet Security: How to Defend Against Attackers on the Web 2nd Ed.", 2015)
"An attack that continually tries different inputs to achieve a predefined goal, which can be used to obtain credentials for unauthorized access." (Shon Harris & Fernando Maymi, "CISSP All-in-One Exam Guide" 8th Ed, 2018)
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