For transaction signing, some services display a QR code that the user scans with an authenticator app, which then generates a signed response – no OTP entry on the vulnerable web page.
Block or temporarily ban any IP address or user account that fails OTP validation more than 3 to 5 times. Implement exponential backoff, where the wait time doubles after each failed attempt. Use Short Lifespans 6 digit otp wordlist
The 6-digit OTP wordlist is a mirror reflecting the true weakness: A million possibilities sounds secure, but if your system allows 1,000 guesses per minute and your users choose 123456 , then your security is an illusion. For transaction signing, some services display a QR
A standard 6-digit numerical wordlist contains exactly ( 10610 to the sixth power Use Short Lifespans The 6-digit OTP wordlist is
Six-digit One-Time Passwords (OTP) are the industry standard for Two-Factor Authentication (2FA) in banking, social media, and enterprise systems. While convenient, the limited keyspace of 6-digit numerical passwords presents a theoretical vulnerability to brute-force attacks. This paper explores the generation of "wordlists"—ordered lists of potential OTP values—analyzing the mathematical probability of successful prediction, the limitations of time-window constraints, and the efficacy of optimization strategies based on human password selection patterns.
If an attacker already has a username/password (from a data breach), they then use an OTP wordlist to try to bypass 2FA on accounts that have poor rate limiting.