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Every Byte of a TLS Connection Explained and Reproduced

tls.ulfheim.net Books & learning Tutorials & guides Security & privacy Candidate
Screenshot of tls.ulfheim.net captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 3 calendar years, with breakout response in 2 of them.

submissions
4
submitters
4
observed span
2018–2021
peak thread · 103 comments
1185 pts
latest 20+ return · 2020-08-15
133 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

Author here - I was going to publish this today but it leaked out ahead of time. Enjoy! EDIT: I'm putting a CDN in place.

It’s a lovely guide. Saves a lot of time vs reading the RFCs when you just want to debug a session state flow/log/packet capture. The one thing I wish it had was better tracing of branch points like session resumption. It would make walking session state logs simpler. I ran into this while trying to figure out if the open source Kubernetes nginx ingress supported session resumption on the upstream side (it doesn’t; a deficiency in the lua balancer). While…

gwittel·133-point thread·

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
1324

reference only — not used in Hall rules or ranking

Total comments
110

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2018-10-12Every Byte of a TLS Connection Explained and ReproducedFirst breakout · Best threadaberoham1185103
2020-05-28Every byte of a TLS connection explained and reproducedsamber20
2020-08-15The Illustrated TLS ConnectionLatest 20+ point returnthamizhan26111337
2021-12-30The Illustrated TLS Connection: Every Byte Explainedggoo40