Modern thieves and fraudsters use in their illegal activities not only such vulgar methods as theft, robbery, but also more subtle methods using the latest achievements of science and technology. Here and eavesdropping on telephone conversations, and the installation of "bugs", including unique laser devices and similar novelties. One of the new types of crimes generated by scientific and technological progress is computer, or "electronic" crimes. This book provides evidence that the threat to the information resource is increasing every day, panicking responsible persons in banks, enterprises and companies around the world. "We live on a very dangerous bomb" - this is, to summarize, the leitmotif of many publications of foreign press devoted to the growing power of electronic AIDS.