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Security
Index of Coincidence Calculator
Compute Index of Coincidence (IC) of ciphertext to distinguish mono/polyalphabetic ciphers — classic cryptanalysis tool.
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Generate strong, random passwords with custom length, uppercase letters, numbers and symbols. Generated in the browser — no data leaves your device.
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Apply classic ciphers (Caesar, ROT13, Atbash) or Base64. Useful for puzzles, CTFs and testing — do not use for real security.
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Password Strength Checker
Check the strength of a password with entropy calculation, common-password check and improvement tips. Runs in your browser — no data is sent.