Is there anyone can help me to find a link or a book that explains the classic cryptography systems.
About modern cryptography I have enough literature, I'm just curios to know more about classic one.

This is all about for learning purposes and nothing else.
I searched, and did not find something good for it how they WORK with encryption and decryption.


Thank you in advance for your reply.
Cheers.Quote

Cryptography prior to the modern age was effectively SYNONYMOUS with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shared the decoding technique NEEDED to recover the original information only with intended recipients, thereby precluding unwanted persons to do the same. Since WORLD War I and the advent of the computer, the methods used to carry out CRYPTOLOGY have become increasingly complex and its application more widespread.

• Substitution and Transposition Cryptography
• Rotor Machines
• Steganography

• Enigma

The PGP thing was developed years ago by non-professionals who had a strong interest in privacy. Their work was so good that it was said to be a violation of national security. I found it easy to read because the work was directed towards just us ordinary people. Yet the concepts very very deep.
Search Amazon for books on PGP. Some old used copies are available at very low cost. Like under $10 plus shipping.