Security teams use tools like OWASP ZAP or Burp Suite Intruder to feed a 6-digit wordlist into an OTP submission form. The goal is to see if the server processes thousands of requests without blocking the traffic. 2. Rate Limiting Verification
with open("otp_list.txt", "w") as f: for i in range(1000000): f.write(f"i:06d\n") Use code with caution. 6-Digit OTPs and Brute-Force Attacks
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Which is your system running (e.g., SMS-based OTP, TOTP via Google Authenticator, or static PINs)? Security teams use tools like OWASP ZAP or
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The most basic defense against wordlist attacks is a strict limit on failed attempts. Most secure platforms allow only 3 to 5 incorrect OTP entries. If a script tries to run through a wordlist, the account is locked out long before the script can cover even 0.001% of the total combinations. 2. Time-Based Expiration (TOTP) Rate Limiting Verification with open("otp_list
The objective of a "wordlist" in this context is distinct from traditional password cracking. Unlike alphanumeric passwords where dictionary attacks target common phrases (e.g., "password123"), a 6-digit OTP wordlist targets the entire finite keyspace or optimized subsets of it based on generation logic or human bias.
Many systems (especially poorly configured web apps) have a flaw: they don’t rate-limit OTP attempts aggressively enough. An attacker who already has a victim’s username and password (stolen via phishing or a data breach) will trigger an OTP request to the victim’s phone. Then, armed with a 6-digit wordlist, the attacker launches an automated script that tries the top 500 codes (like 123456 , 111111 , etc.) within the 60-second window. If the victim chose a weak OTP seed or the system has a long validity window (e.g., 5 minutes), the attacker breaks in.
More advanced wordlists incorporate service-specific constraints – for instance, some banking apps reject codes with repeating digits or sequential patterns, so attackers adjust accordingly.
4. Use Cryptographically Secure Random Number Generators (CSPRNG)