Verify brute-force crack times, generate cryptographically secure passwords, and build memorable Diceware passphrases. We never see, log, or store your passwords — all computations run in your local browser sandbox.
All computations run strictly inside your browser's local sandbox memory using the Web Cryptography API. We never store, log, or transmit your passwords.
Web login with rate-limits (100 guesses/sec).
Unthrottled API endpoint (10,000 guesses/sec).
Dedicated 8x RTX 4090 cluster (100B hashes/sec).
Enterprise/State farm (100 Trillion/sec).
Most online "password strength checkers" send your keystrokes across the internet to an analytics server. Here is how SecurityTools is fundamentally engineered differently.
All entropy calculations, dictionary matching, and crack-time evaluations happen within the JavaScript V8 / JavaScriptCore runtime of your own machine. Nothing is transmitted over HTTP.
We reject standard pseudo-random functions like Math.random(). All random strings are generated via window.crypto.getRandomValues(), harnessing hardware entropy from your CPU.
You can turn on Airplane Mode, unplug your Ethernet cable, or disable Wi-Fi right now. Every tool on SecurityTools will continue generating passwords and evaluating strength with full functionality.
Press F12 or Ctrl+Shift+I, open the Network tab, and test a password. You will observe exactly zero requests.
Authoritative, jargon-free explanations of modern attacks and defense methodologies.
Most people imagine hackers typing away in a dark room guessing passwords one by one. In reality, modern credential attacks are industrial-scale mathematical operations. Here is how they actually work.
You have probably been prompted to turn on 'Two-Factor Authentication' everywhere from your bank to your email. But what actually happens under the hood, and why is SMS authentication increasingly dangerous?
For three decades, we have been told to create 8-character passwords with uppercase, numbers, and symbols that even humans cannot remember. It turns out the mathematics favored passphrases all along.
Clear answers regarding privacy, encryption standards, and password security.
No. Zero network requests occur when you enter or generate a password. You can inspect the network activity in your browser's Developer Tools or disconnect from the internet entirely while using this tool.
Crack times are calculated using Shannon entropy principles ($E = L \times \log_2(R)$) mapped across real-world attacker hash-rate benchmarks: from rate-limited web login throttling (100 guesses/sec) to modern high-density GPU clusters (8x RTX 4090 rigs testing 100 billion hashes per second on fast hashes like MD5/NTLM).
Passphrases combine multiple random dictionary words (Diceware). A 5-word passphrase has roughly 65-75 bits of mathematical entropy, requiring thousands of years to crack even on dedicated supercomputers, while remaining easy for human memory to retain without relying on insecure paper sticky notes.