Cryptography with a secret key. Ciphers

From the cipher of Caesar from the time of the Roman Empire to the Enigma encryption machine used in the Second World War, secret messages influenced the course of history. Nowadays, cryptography with a secret key is a standing ridge of all modern calculation architecture. Being correctly designed, these algorithms are almost effective. And some are unknown even with the use of supercomputers and quantum technologies!
The book explains how to create ciphers with a secret key - from simple, for which there is enough pencil and paper, to very complex, used in modern computer cryptography. You will learn to effectively encrypt large files using fast stream ciphers, learn about the AES encryption alternatives and you can avoid ciphers that only seem persistent. And for entertainment, it is proposed to open several simple mini-shifers.
The publication is intended for professional engineers, specialists in computer science and amateur cryptographers