$1.(50$ pts$)$downgrade attack$$ refers to the attack where the attacker intercepts the message sent by Alice to Bob, which includes the cipher suites that Alice supports. The attacker deletes the most secure ciphers that Alice can support and the relay this message to Bob. As a result, Bob will chose to use the less secure algorithm to communicate with Alice by thinking that is the only algorithm that Alice supports. Explain how does TLS $1\mathrm{.}2/1\mathrm{.}3$ defend against the downgrade attack.