Bob connects to a public Wi-Fi

at a coffee shop and uses a website that claims to support end-to-end encrypted

messaging using Diffie-Hellman key exchange. However, an attacker sitting

nearby is able to intercept and read Bob’s messages. Later, Bob realizes that

his device never received a security warning.

Which of the following is the

most

likely

a) The attacker modified Bob’s

public key and inserted their own during the key exchange.