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Password Auditor
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Shannon Math & zxcvbn Heuristics Engine

Password Entropy & Strength Auditor

Evaluate password strength using information entropy math and heuristic estimation with zero network transmission. Test resilience against modern multi-GPU Hashcat clusters.

password strength checker onlinetest password entropysafe password testerNIST SP 800-63B Compliant

Type or paste any credential. Tested entirely in memory with zero network transmission.

Length: 28 charsUnique: 13Pool: 59
a-z (25)A-Z (0)0-9 (0)#$& (3)
Quick Test Scenarios:Click to audit presets
Overall Auditor ScoreMilitary / Quantum Grade
100/ 100

Maximum cryptographic resistance. Computationally impossible to crack.

Effective Entropy
112.6bits

Adjusted for heuristic bias

Shannon Entropy
97.9bits

Character distribution entropy

Charset Pool (R)
59chars

Symbols in active charset

Pattern Penalty
0bits

Zero pattern penalty

Multi-Scenario Crack Time Estimation

Mathematical estimate to test 50% average keyspace combinations at varying hardware hash rates.

Keyspace: 2^112.6 attempts
Online Throttled Attackunbreakable

100 guesses/sec (Web Login with rate limits & CAPTCHA)

Time to Crack:Centuries of Universe Lifespan (10¹²⁺ yrs)
Online Unthrottled APIunbreakable

10,000 guesses/sec (Distributed Botnet attacking APIs)

Time to Crack:Centuries of Universe Lifespan (10¹²⁺ yrs)
Offline Slow Key Derivationunbreakable

10,000 guesses/sec (Argon2id / bcrypt Cost 12)

Time to Crack:Centuries of Universe Lifespan (10¹²⁺ yrs)
Offline Fast Hash (Single High-End GPU)unbreakable

10 Billion guesses/sec (RTX 4090 on MD5 / SHA-256)

Time to Crack:Centuries of Universe Lifespan (10¹²⁺ yrs)
Offline Multi-GPU Superclusterunbreakable

100 Trillion guesses/sec (Dedicated Nation-State Rig)

Time to Crack:Centuries of Universe Lifespan (10¹²⁺ yrs)

zxcvbn Pattern Auditor

0 patterns detected

Clean Heuristic Profile

No common dictionary roots, keyboard spatial walks, or cyclic repetitions were found.

NIST SP 800-63B Checklist

7 / 7 Passed
NIST Minimum Length (≥ 8 Characters)Required

28 characters satisfies SP 800-63B baseline requirement.

Enterprise Robust Length (≥ 16 Characters)

Exceptional resistance against multi-GPU offline hash searching.

Zero Common Wordlist / Leaked Password HitsRequired

No match found against global top breached credential wordlists.

Absence of Keyboard Walks & Cyclic Patterns

Free of predictable QWERTY walks, repetitive blocks, or sequential runs.

Character Entropy Diversity (Pool Size ≥ 60)

Active pool space: 59 distinct symbols.

Resilience Against GPU Offline Cracking (≥ 64 bits)Required

112.6 effective bits (64+ bits recommended to defeat GPU clusters).

Absence of Obvious Dates or Calendar Years

No 4-digit historical, calendar, or birth year markers detected.

Cryptographic Theory

How Information Entropy & Modern Password Cracking Work

Understanding the mathematics of brute force search, GPU parallelism, and modern identity standards.

H = L × log₂(R)Shannon Formula

Information entropy quantifies unpredictability in bits. Each bit added doubles the number of guesses required (2H). An 8-character password from 94 ASCII symbols has ~52 bits, whereas a 16-character password has over 105 bits of keyspace.

XKCD #936Length Beats Symbols

Humans picking complex symbols like "Tr0ub4dor&3" are hard for humans to remember yet easy for computers to crack via leetspeak rules. Long Diceware passphrases ("correct-horse-battery-staple") are memorable and mathematically resilient.

HashcatFast Hashes vs Slow KDFs

Modern GPUs test over 100 billion MD5 or NTLM hashes per second. Strong systems utilize slow memory-hard key derivation functions like Argon2id or bcrypt to limit hardware parallelism, protecting credentials even after database leaks.

Frequently Asked Questions

Clear answers regarding privacy, entropy thresholds, and safe authentication.