The course makes students familiar with basics of cryptology and information security, where the latter is covered in the areas of authentication, electronic signature, privacy. The opening of the course is dedicated to cryptology - its history, light mathematical background, block ciphers, random number generators, a couple of cryptanalysis examples. This is followed by authentication of data and users, authentication protocols. Next topis is a detailed overview of electronic signatures (archiving, time validity, signature creation/verification). The last large topis encounters privacy - definition of privacy, can it be measured, why it is becoming an issue. Final lectures go through a number of smaller areas. Secure devices, key management, and payment protocols.