ABSTRACTS AND KEYWORDS

  This article presents an approach to the vast field of cryptology, adopting a fundamentally historical point of view. Given the extent and complexity of the topic, we will focus specifically on the case of substitution cryptography and cryptanalysis. For a proper understanding of the concepts involved, the underpinnings of modular arithmetic and its application in message: Cryptology, History, Visual cryptography, Data Security, Quantum Cryptography.