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Strong Password Generator

Generate cryptographically secure passwords and Diceware passphrases. Features real-time entropy analysis, crack-time estimation, and offline QR code generation.

User Rating 0.0 ★★★★★
Total Usage 0 times
Category Security
Password Strength Very Strong
Entropy 0 bits
Crack Time (GPU) 0s
Character Pool 0
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About

This Enterprise-Grade Password Generator is designed for zero-trust environments. Unlike standard tools that rely on pseudo-random number generators (PRNG), this engine utilizes the browser's window.crypto API to access the operating system's entropy pool, ensuring that generated strings are cryptographically secure and statistically unpredictable.

password encryption security privacy diceware entropy

Formulas

The strength of the password is calculated using the Shannon Entropy formula:

H = L × log2(N)

Where L is the password length and N is the size of the character pool (e.g., 62 for alphanumeric). Crack time is estimated by dividing the total combinations (2H) by the attacker's guess rate (approx 100 billion/sec for modern GPU clusters).

Reference Data

MetricMinimum StandardEnterprise StandardThis Tool
Randomness SourceMath.random()/dev/urandomwindow.crypto (CSPRNG)
Entropy Target40 bits80 bits128+ bits Capable
Ambiguity HandlingNoneBasic FilteringAdvanced Visual Exclusion
Offline CapabilityPartialYes100% Client-Side
Dictionary SizeN/A1,000 words4,000+ Words (EFF)
Mobile TransferManual TypingCloud SyncLocal QR Code (Air Gap)

Frequently Asked Questions

This is known as the "Diceware" concept. A passphrase made of 4 random words (from a list of 7,776) has roughly 51 bits of entropy, which is high. However, it is much easier for a human brain to remember and type than a complex 10-character random string. Length beats complexity in modern cryptography.
Yes. The QR code is generated locally in your browser using JavaScript. No data is sent to any server. This allows you to scan the password directly into your phone's password manager without typing it manually or copying it via an insecure clipboard.
Certain fonts make the number "1", the lowercase letter "l", and the uppercase letter "I" look identical. The same applies to "0" and "O". Enabling this feature removes these characters from the pool to prevent lockout errors when typing the password manually.
We assume a "Brute Force" scenario where an attacker uses a massive array of consumer-grade GPUs (like the RTX 4090) or a specialized ASIC cluster, capable of guessing roughly 100 billion hashes per second (MD5 benchmark). If the time exceeds 100 years, we consider it "Uncrackable".