Stanford JavaScript Crypto Library

The Stanford Javascript Crypto Library
(hosted here
on GitHub) is a project by the Stanford Computer Security Lab to
build a secure, powerful, fast, small, easy-to-use, cross-browser
library for cryptography in Javascript. Read more

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Logic Gates in JavaScript

Code, by Charles Petzold, is a fascinating look at building computers from the ground up. Starting in Chapter 11, it walks through creating logic gates. These can be used (amongst other things) to add numbers together. (more…)

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