Wenn man den Threema QR Code mit einem QR Code Scanner liest
erhält man den PublicKey als Klartext.
Kann man irgendwo in der ThreemaApp den PublicKey seiner Kontakte auslesen?
Aus dem Threema Whitepaper:
To upgrade a contact from the red or orange to the green level, the user must scan that contact’s public QR code. This QR code is displayed in the “My ID” section of the app, and uses the following format:
3mid:<identity>,<publicKeyHex>
where <identity> is the 8-character Threema ID, and <publicKeyHex> is the hexadecimal (lowercase) represen- tation of the user’s 32 byte public key. The app verifies that the scanned public key matches the one that was returned by the directory server.
Quelle: https://threema.ch/press-files/cryptography_whitepaper.pdf