U.S. Army Guide to Code Breaking
sebFlyte writes "From the introduction of this document, the U.S. Army's field manual guide to Cryptanalysis: 'This manual presents the basic principles and techniques of cryptanalysts and their relation to cryptography. Cryptanalytics is the art and science of solving unknown codes and ciphers.'"
Or the doodlings of a computer software billionaire.
"It's the height of ridiculousness to say for those 9 lines you get hundreds of millions."
If you are interested in how this stuff all works and came about in the first place, a really interesting book is "Between Silk and Cyanide" by Leo Marks.
It was a really great read...