Secret-Key Crypto From Caesar to AES
Book: Computational Number Theory and Modern Cryptography
Author: Song Y. Yan
ISBN: 978-1-118-18858-3 (Wiley, 2013)
Chapter 6 is the warm-up. Yan says cryptography starts from secret-key cryptography, then he spends most of the pages teaching you the vocabulary you need for RSA. I did not mind. The number theory so far had no Alice. Now there is Alice, Bob, and Eve.