18.7 Summary
In this chapter, we discussed the TLS 1.3 cipher suites, including those that every TLS endpoint must implement. We covered the alternative cipher suite ChaCha20-Poly1305 as well as its building blocks, ChaCha20 block cipher, and Poly1305 message authentication code.
On a more fundamental level, to aid in-depth understanding of TLS cryptography, we discussed how advances in cryptanalysis can affect long-term security, how this risk can be mitigated using cryptographic agility, and how the concept of a standby cipher implements this pattern in TLS 1.3.
This chapter concludes the third part of the book. In the next part, we will change the perspective and look at TLS in general, and TLS 1.3 in particular, from an attacker’s point of view. We will first cover attacks on cryptographic schemes and cryptographic protocols from a conceptual, theoretical perspective.
