How the CIA’s Kryptos Sculpture Gave Up Its Final Secret

The 35-year-old saga of Kryptos, an enigmatic sculpture containing four encrypted messages outside the CIA headquarters, just ...
insider.si.edu

The mathematics of secrets : cryptography from Caesar ciphers to digital encryption / Joshua Holden

Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...
Scientific American

How the World’s Most Famous Code Was Cracked

How does one crack the world’s most famous code? The breakthroughs on Kryptos provide a guided tour through the cat and mouse game between code makers and code breakers that has defined information ...
PBS

Cryptography 101

You can make a message secret in countless different ways. One common way is to use a substitution cipher, in which one letter is substituted for another. Another is to employ a transposition cipher, ...