Εφαρμογές της θεωρίας πληροφορίας στην ασφάλεια δικτύων
SubjectΔίκτυα πληροφόρησης -- Μέτρα ασφαλείας ; Πληροφοριακά συστήματα -- Μέτρα ασφαλείας ; Πληροφορίες, Θεωρία των
Nowadays, the effective and correct transport of information from the source to the destination constitutes key for its correct operation and development. Certain simple and daily examples are the transport of economic information via telephone lines, the transport of data from a computer to another or from the memory to the central processor unit and the transport of data from satellites to the Earth. Communication channel is the natural means which transmits the information and some examples of channels are the telephone lines and the atmosphere. Unfortunately, noise acts upon the communication channels and causes alteration of transmitted information. The channel coding is a well calculated use of pleonasm with objective the error detection and correction which is caused by the noise during the transmission of information in the communication channel. In this master’s thesis the necessity of use of channel coding is justified, basic significances are reported in order to make the text easy perceptible from the reader, techniques and codes for error detection and correction are examined and finally the main categories of channel codes are analyzed including their advantages and disadvantages with final aim the optimisation of already existing codes, the recovery of better code combinations and why not the discovery of new codes that will annihilate the probability of alteration of information because of the noise.