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Password-guessing attacks
A password-guessing attack is a cyber intrusion where threat actors systematically attempt multiple character combinations or predictable phrases to gain unauthorized access to user accounts. Unlike offline password cracking (which reverses encrypted cryptographic hashes), password guessing primarily exploits weak, human-chosen habits through interactive, online authentication requests.
Core Types of Password-Guessing Attacks
Cybercriminals categorize their password-guessing tactics based on target scope and available data:
Trawling / Spraying Attacks:
Attackers test a single highly common password (like
123456
or
password)
across thousands of usernames simultaneously. This evades standard
security lockouts by staggering attempts per account.
Targeted Guessing: Threat actors harvest personally identifiable information (PII) like names, birth dates, or pet names from social engineering or social media. They inject this contextual metadata into custom-built guessing scripts.
Dictionary Attacks: Automated scripts use precompiled text files filled with hundreds of thousands of common words, phrases, and previously leaked credentials to quickly identify simple passwords.
Brute-Force Attacks: Software checks every possible character permutation systematically. While highly effective against short codes (like 4-digit PINs), it scales exponentially in difficulty as lengths increase.
Credential Stuffing: Bad actors weaponize massive databases of leaked username-and-password combinations bought on dark web forums. Automated bots "stuff" these matching pairs into retail, financial, and institutional login portals