Means and methods of information protection A manual for high schools - 4 th ed. Ispra. and added. - ("Textbook for higher education") (neck) / Tekhnicheskie sredstva i metody zashchity informatsii Uchebnoe posobie dlya vuzov - 4-e izd.,ispr. i dop. - ("Uchebnoe posobie dlya vysshikh uchebnykh zavedeniy") (GRIF)