11.8 Summary
In this chapter, we learned how hash functions and message authentication code work, what mathematical properties they have, and how to construct them. Moreover, we covered several popular mechanisms, such as HMAC and the SHA-256, SHA-384, and SHA-512 algorithms from the SHA-2 hash algorithm family. Last but not least, we looked into the application of hash functions and message authentication code in the TLS 1.3 handshake protocol.
This chapter introduced the last building block required to understand how the TLS handshake protocol works in detail. Congratulations: you now know what Alice and Bob actually do to establish a TLS session!
In the next chapter, we will wrap up TLS 1.3 handshake. To do this, we will zoom out of the cryptographic details and give a higher-level description of TLS handshake using state machines for the TLS server and TLS client, which are specified in RFC 8446. Moreover, we will show how you can use s˙client, a TLS client program from the...
