![]() Transmission / creation of authentication code is via USB or NFC between hardware key and computer without manual typing steps.Plaintext code is displayed and typed by user manually, visually.Challenge / response is signed (encoding originating domain/website) to prevent interception and reuse.Plaintext code response vulnerable to interception and MITM attack if user has been phished by malicious website.Private key only stored on user hardware device.Transmission of public key challenge / response.Shared secret may be stored in plaintext on server. ![]()
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