+1 for the fact that the "get book" button on linked site just downloads the pdf.

Thanks, for the comment. I wouldn't have bothered with this otherwise. Normally a "Download our PDF|Whitepaper|Whatever" is a 100% sure way to make me close a site immediately nowadays - and this is what I did. Just stumbled upon your comment because the tab was still open and it was the first comment.

VirusTotal seems to be cool with the file too, so that's how it should be.

https://www.virustotal.com/#/file/fe42077288cfaa6d1d1b83c088...

You can get the org mode plaintext source here: https://github.com/crypto101/book.

It doesn't read as well as the PDF because there's a ton of illustrations and _something_ has to render them.