Both key exchanges run in the same round journey, the shopper sends each key shares in its first message, and the final shared secret is the concatenation of the ML-KEM shared secret and the X25519 shared secret fed into the similar old key schedule. The ML-KEM element is placed first [...]

This is how non-public messages can be despatched with out exchanging a shared secret key. It is protected from unauthorized entry and is accessible only to users or software which have the proper decryption key. At Present, encryption has become a best practice, and is used across a large spectrum [...]