This attack is used when the attacker gets some information about the password.

This attack is used when the attacker gets some information about the password.

• A. Rainbow Table Attack
• B. Rule-based Attack
• C. Dictionary Attack
• D. Brute Force Attack

Answer: (B)

When some information about the password is known, a rule-based attack becomes effective by transforming a base set of words with a defined set of rules. The attacker uses these rules to generate likely guesses that reflect common modification patterns, such as capitalizing, adding digits, or substituting characters, tailored to the known clues. This approach is efficient because it concentrates guesses around plausible variants rather than trying random combinations or every possible string. It leverages knowledge about how passwords are often formed, turning a smaller, known set into a targeted set of candidates. By contrast, rainbow table attacks rely on precomputed hash tables, not on exploiting partial password knowledge; plain dictionary attacks use words without enough transformation to reflect the clues; and brute-force attempts all possible combinations without guidance, which is far more time-consuming.

When some information about the password is known, a rule-based attack becomes effective by transforming a base set of words with a defined set of rules. The attacker uses these rules to generate likely guesses that reflect common modification patterns, such as capitalizing, adding digits, or substituting characters, tailored to the known clues. This approach is efficient because it concentrates guesses around plausible variants rather than trying random combinations or every possible string. It leverages knowledge about how passwords are often formed, turning a smaller, known set into a targeted set of candidates. By contrast, rainbow table attacks rely on precomputed hash tables, not on exploiting partial password knowledge; plain dictionary attacks use words without enough transformation to reflect the clues; and brute-force attempts all possible combinations without guidance, which is far more time-consuming.