Observed arrival · 2026-10-16
Cryptography, one operation at a time
A set of interactive, in-browser lessons walks through cryptographic algorithms and protocols, from SHA-256 to TLS handshakes.
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Cryptography students and instructors
- Worth noticing
- The SHA-256 walkthrough calls out the 55/56-byte padding cliff and links each step to a section of the relevant standard.
Field notes
The SHA-256 example lets readers enter text and observe its digest, while the lesson breaks down padding, message scheduling, and compression rounds. The page says its test harness checks the shipped JavaScript against independent implementations, browser APIs, or published test vectors. It also describes linkable steps, printable pages, and a maths-only view for lectures; several other catalogue topics are marked “next.”
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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