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Hat.sh is a web app that provides secure local file encryption in the browser. It's fast, secure, and uses modern cryptographic algorithms with chunked AEAD stream encryption/decryption.

Features

Security

  • XChaCha20-Poly1305 - for symmetric encryption.
  • Argon2id - for password-based key derivation.
  • X25519 - for key exchange.

Privacy

  • The app runs locally in your browser.
  • No data is ever collected or sent to anyone.

Functionality

  • Secure multiple file encryption/decryption with passwords or keys.
  • Secure random password generation.
  • Asymmetric key pair generation.
  • Authenticated key exchange.
  • Password strength estimation.