The purpose of the TLS handshake protocol is to ________.

Question

BlackTom AI · Accepted Answer

The question asks about the purpose of the TLS handshake protocol. 
Option a: 'establish a shared private symmetric key between server and client' — This is the core goal of the TLS handshake: to negotiate and establish keys that both parties will use to encrypt subsequent communication, typically a symmetric key. This option accurately captures the handshake’s primary outcome. 
Option b: 'all of the above' — This is not correct because some of the other statements describe outcomes that are not precisely accurate for the handshake itself, or describe stages beyond the handshake. 
Option c: 'encrypt messages with a symmetric key' — While TLS does encrypt application data with a symmetric key, this occurs after the handshake has completed and the keys have been established. The handshake itself does not perform ongoing data encryption; it negotiates the keys and parameters used for encryption later. Therefore, this statement describes a consequence of the TLS process, not its explicit handshake purpose. 
Option d: 'establish a shared public key between server and client' — TLS does involve the use of public-key cryptography to authenticate the server (via certificates) and to protect key exchange, but it does not result in a 'shared public key' in the sense of both parties sharing a new public key. Public keys are typically distributed by certificate authorities and used by each party as needed; the handshake does not culminate in both parties sharing a new public-key value usable as a symmetric key. 
In summary, option a correctly identifies the handshake’s primary objective, while options c and d describe outcomes or aspects that are either subsequent to the handshake or are mischaracterized. Option b claims all are true, which is not the case since option c describes a post-handshake activity rather than the handshake’s direct purpose, and option d misstates how public keys are shared during TLS.

FIT1093_S2_2025 Week 9 MCQ: Security Protocols

The purpose of the TLS handshake protocol is to ________.

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