Deploying TLS 1.3: the great, the good and the bad

Improving the encrypted the web, one round-trip at a time

Filippo Valsorda and Nick Sullivan

Transport Layer Security (TLS) 1.3 is almost here. The protocol that protects most of the Internet secure connections is getting the biggest ever revamp, and is losing a round-trip. We will explore differences between TLS 1.3 and previous versions in detail, focusing on the security improvements of the new protocol as well as some of the challenges we face around securely implementing new features such as 0-RTT resumption. At Cloudflare we will be the first to deploy TLS 1.3 on a wide scale, and we’ll be able to discuss the insights we gained while implementing and deploying this protocol.

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