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Crypt

Encrypted Bluetooth mesh messenger

An applied cryptography exercise with a hard constraint: no servers anywhere in the trust model. Identity is established face-to-face by QR code, and keys never touch the internet — so there's no account to compromise and no operator to subpoena.

What it does

  • AES-256-GCM encrypted messaging with no internet, servers, or accounts
  • Messages relay phone-to-phone over Bluetooth mesh until delivered
  • Identity established face-to-face via QR code
  • Keys never touch the internet
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