Захист інформації відомчої інформаційно-телекомунікаційної мережі за допомогою парольної системи

Abstract

The approach to quantitative estimation of stability of password systems taking into account power of space of passwords and length of the password is theoretically substantiated. The formalized idea of information entropy as an approach to measuring the amount of information that is unknown through random variables is determined by the randomness of a variable based on the knowledge contained in another part of the message. It is established that the greater the entropy in a given distribution of passwords, the more difficult it is to guess the password that was chosen from this distribution; passwords with higher entropy values require more expected assumptions, which makes entropy useful as a measure of password strength. Proposals for password management of the departmental information and telecommunication network of the object of critical information infrastructure are given. Studies show that much of the entropy introduced by uppercase and lowercase characters is created by users who exceed the minimum requirements of the password strength policy. Secure password creation is complicated by the trade-off between developing passwords that are both difficult to crack and use. Accordingly, the access control policy is important. Studies show that much of the entropy introduced by large and non-alphanumeric characters is created by users who exceed the minimum requirements of the password strength policy: the use of more digits than necessary, different positions of special characters. It is concluded that text passwords remain the dominant method of authentication in computer systems, despite significant improvements, including smart cards, RFID cards, USB tokens and graphic passwords, which have their advantages and are suitable for use in a particular environment or for a specific program. It is noted that there are few published empirical studies that would examine the strategies used by users under different password policies. Further research is planned in this direction/