Abstract:
The issue of changing and protecting information so that it cannot be read by other outsiders
has been thinking about humanity since ancient times. The history of cryptography is developing in
parallel with the history of human language. Even the writing itself was originally a cryptographic
system because, in ancient times, only a select few knew how to write. When writing became
widespread, cryptography developed as a separate science. Cryptographic systems developed well
during the years of the First and Second World Wars. Since the post-war time, the emergence of
computing equipment up to this point accelerated the creation and improvement of cryptographic
methods. In the modern world, cryptography has entered into everything, from mobile phones to email programs, bank cards, smart homes and even into medical implants. This is quite different from
the past, where cryptography had been traditionally confined to very specific applications, especially
government communications and banking systems. As a consequence of the pervasiveness of crypto
algorithms, people should understand how they work and how they can be applied in practice. This
article addresses this issue by providing a comprehensive introduction to modern applied
cryptography and provides the reader with a deep understanding of how modern cryptographic
schemes work.
