Basics Of Cryptography

Ovaj rad opisuje neke od poznatijih kriptosustava. Mnoge povijesne ličnosti poput kraljice Marije Stuart koristili su šifre, što je opisano u uvodnom dijelu. Također, opisana je i definicija kriptosustava te osnovni pojmovi koji su korišteni u cijelom radu. U glavnom dijelu opisane su monoalfabetske Cezarova i afina šifra te polialfabetska Vigenèreova šifra. Također, opisana je i blokovna Playfairova te poligramska Hillova šifra. Pojam savršene sigurnosti uveden je kroz jednokratnu bilježnicu. Stupčana transpozicija i šifriranje rešetkom opisani su u posljednjem poglavljuIn this paper, we describe some of the better known cryptosystems. Many historical figures such as Queen Mary Stuart used ciphers, which is described in the introduction. Also, the definition of a cryptosystem and the basic terms used throughout the paper are described. In the main part, the monoalphabetic Caesar and Affine ciphers and the polyalphabetic Vigenère cipher are described. Also, the block Playfair cipher and the polygram Hill cipher are described. The concept of perfect security was introduced through a One-Time Pad. Columnar transposition and rail fence cipher are described in the last chapter