The classic guide to how computers work, updated with new chapters and interactive graphics "For me, Code was a revelation. It was the first book about programm

When R. Neville Johnston was shot three times in 1977, he died. But he came back knowing some things he hadn't known before. That the universe is made of up of

An exploration of how codes—both cipher and aesthetic—have come to exist in history from Pythagoras through the Knights Templar to Turing and more. Did the

Protect your diary from snooping siblings. Share your secrets with a BFF. Guard your texts from unwanted eyes. Create the lingua franca for your own fantastical

This illustrated encyclopedia surveys the history and development of code-making and code-breaking in all areas of culture and society from hieroglyphs and rune