A/B Testing Password Strength (Annual) Calculator FAQ
Answers to common questions about comparing password search space, annual brute-force likelihood, guessing rates, and cracking-time estimates.
This FAQ explains what the A/B Testing Password Strength (Annual) Calculator measures, how to choose inputs, and why its results are estimates rather than a full measure of account security.
General calculator questions
Basic information about the comparison and its intended use.
What does this password strength calculator compare?
It compares two password designs using their length, character set size, assumed annual brute-force exposure, and estimated average exhaustive-search time.
Does the calculator test my real password?
No. Use only a password design's length and assumed character set size. Do not enter a real password into public tools.
What does Password B relative to Password A mean?
It shows Password B's theoretical search space divided by Password A's. A value above 1 means Password B has more possible combinations.
Is a larger search space always better?
For random passwords under brute-force guessing, a larger search space means more guesses are needed. It does not address non-brute-force risks.
Inputs and formula questions
How the calculator turns password-design inputs into estimates.
What is character set size?
It is the number of characters that could appear in each position. Lowercase letters have 26 possibilities, while letters, digits, and common symbols may total about 94.
How is the search space calculated?
The calculator raises the character set size to the password length. For example, a random 12-character password from 94 characters has 94^12 possible combinations.
How is the annual guess budget calculated?
It multiplies the effective guesses per second by 31,536,000, the number of seconds in a 365-day year.
Why is the annual likelihood capped at 100%?
A probability cannot exceed 100%. The cap prevents the simplified annual guess-budget ratio from displaying a larger value.
Guessing rates and cracking time
How the attack-rate assumption changes the results.
What guess rate should I enter?
Use an effective rate that reflects the relevant environment, including password hashing, rate limits, lockouts, and the type of access an attacker is assumed to have.
Why can online and offline attack estimates differ?
Online attempts may be slowed by login controls, while offline attempts can depend on the protection applied to stored password data. The calculator lets the chosen rate represent either modeled environment.
What is expected crack time?
It is the average time for exhaustive guessing to find a uniformly random password, assuming the correct password is found halfway through the possible combinations.
Does expected crack time mean an attacker needs exactly that long?
No. It is an average model. A particular password could be found earlier or later depending on its position in the guessing order and the actual attack conditions.
Accuracy and security limits
Important reasons real-world outcomes can differ from the calculation.
Why might a human-created password be weaker than this estimate?
People often use words, patterns, substitutions, and personal details that attackers can prioritize. Those choices are not uniformly random across the stated character set.
Does this calculator account for password reuse?
No. Reused credentials can be exposed or tested elsewhere without requiring brute-force search of the theoretical password space.
Does multi-factor authentication change the password calculation?
It does not change the password's search space, but it can add another barrier to account access. The calculator does not quantify that additional protection.
Can a long password still be risky?
Yes. A long password can still be exposed by phishing, malware, password reuse, or predictable construction.
How is password search space calculated?
Search space equals character set size raised to password length. This represents the theoretical number of random combinations.
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