Kryptologie a utajování dat: Vernamova šifra

Cryptology and Data Secrecy: the Vernam Cipher In this text I deal with reasons and fundamentals of sensitive data concealment. After general cryptographic prologue in an economic context I concentrate on a description of currently used cryptosystems - symetric and asymetric cryptographic algorithms. Although nobody has ever proved them to be unimpeachable, they are used widely. The reason is that the existing methods of their cryptoanalysis based on the best factorization algorithms ever discovered do not provide us with even a small chance of breaking these cryptosystems. I also mention some new trends in cryptoanalysis regarding quantum computation. The main topic of this text is the Vernam cipher - a monogrammatic polyalphabetic substitution cipher with one-time pad. Up to the presend day, the Vernam cipher is the only utterly secure cryptosystem known (providing certain rules - which are described - are adhered to). Moreover, it`s security can be mathematically proved. In everyday use however, certain problems may appear, these can be quite easy solved though (or even passed by).