STalk - zabezpečená aplikace pro komunikaci

Abstract

In the present work we study the methods of using cryptographic algorithms to ensure the security of communication over computer networks and give a new perspective on the classic UNIX console chat program called talk. The thesis starts by describing the various protocols of the TCP/IP protocol suite, and also gives a brief description of how these protocols are used from the viewpoint of a UNIX programmer. It is followed by a cryptographic overview, mainly the description of the RSA and DES algorithms. Finally, the program's implementation and usage is described.