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Security
Cookie __Secure-/__Host- Prefix Validator
Validate Set-Cookie headers against __Secure- and __Host- prefix rules from RFC 6265bis (Secure, Domain, Path).
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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.