5.3 Dual Generation Mode (Backup)

To prevent single-point-of-failure risks, the card supports dual generation mode, allowing two Cryptnox cards to collaboratively generate the same master seed:

1. Each card generates a partial secret internally.
2. The secrets are exchanged over an ECDH-encrypted Secure Channel.

Both cards combine the secrets to compute the same final seed.
As a result, two cards hold identical seeds, providing a built-in backup mechanism without exposing any sensitive data externally.