ABSTRACT
“One of the most singular characteristics of the art of deciphering is the strong conviction possessed by every person, even moderately acquainted with it, that he is able to construct a cipher which nobody else can decipher. Shannon’s development was also based on Harry Nyquist’s work, which determined the sampling rate as a function of frequency necessary to reconstruct an analog signal using a set of discrete samples. Entropy comes from the Greek word for transformation and, in physics, is related to the logarithm of the ratio between the final and initial temperature of a system or to the ratio of the heat variation and the temperature of the same system. The concept of information transmission is associated with the existence of a communication channel that links the source and destination of the message. This can imply the occurrence of transmission errors, caused by the probabilistic nature of the channel.
