Cryptography and Cryptanalysis in Java: Creating and Programming Advanced Algorithms with Java SE 17 LTS and Jakarta EE 10

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

S. L. Nita, M. I. MihailescuCryptography and Cryptanalysis in Javahttps://doi.org/10.1007/978-1-4842-8105-5_5

5. Classical Cryptography

Stefania Loredana Nita¹   and Marius Iulian Mihailescu¹

(1)

Bucharest, Romania

 

Humans have been hiding messages from the very first moment they started sending messages. In the early ages, messages were sent between leaders, emperors, conquerors, kings, and so on, in the form of verbal messages through a human messenger. Although unspoken rules protected the human messengers, sometimes this rule was not followed, and the messenger was caught by enemies. At that point, all the enemy needed to do was send an altered message to ...