Abstract:
Since ancient times, methods of coding information have been used to ensure
confidentiality. Roman Emperor Caesar proposed among the first a substitution-based encryption
algorithm. Today it is called Caesar Cipher. The idea was simple, replacing the letters according to
a key initially established and known to both the source and the recipient. Today, however, the
amount of information is growing exponentially, computers have made available to mankind the
computing power as it never was before. Therefore, the confidentiality of the data has been
attacked.