SSL/TLS ensures session key secrecy through the following process:
1. Client and server agree upon a cipher suite that will be used for the communication.
1. During the SSL/TLS handshake process, the client generates a session key that is used for encrypting and decrypting data exchanged during the session.
1. The session key is then encrypted using the server’s public key and sent to the server.
1. The server uses its private key to decrypt the session key and starts using it for encrypting and decrypting data exchanged during the session.
1. Since the session key is unique for each session and is only known to the client and server, it ensures that the communication between them remains secure and confidential.
1. Furthermore, SSL/TLS also provides perfect forward secrecy (PFS) which ensures that even if the private key of the server is compromised, the previously exchanged session keys cannot be decrypted, ensuring that the session data remains secure.
In summary, SSL/TLS ensures session key secrecy by using public-key cryptography to securely exchange a unique session key between the client and server, which is then used to encrypt and decrypt data exchanged during the session.
