Article

Article title ANALYSIS OF PASSPHRASES RESISTANCE BASED ON INFORMATION ENTROPY
Authors K.A. Turin, R.V. Semin
Section SECTION I. COMPUTER SECURITY
Month, Year 05, 2015 @en
Index UDC 004.056.53
DOI
Abstract As is known, unauthorized access to critical information systems causes damage to many companies, and this damage grows year by year. Even if the technical protection is high, the human factor has a great influence on security of multi-user information system. The attacker is able to optimize the procedure of attacks on information systems by investigating the nature of this influence. This means that the influence of the human factor and the possibility of using user’s information for the attacks are important for researching. In most cases, information systems use the single-factor password authentication or some other method that includes this one (most two-factor authentication methods use the permanent password as one of the factors). Investigations show that users often use informative sequence of characters as their passwords. This is explained by the fact that such passwords are easier to remember. Information component allow passwords to contain fragments of natural languages words, keyboard layouts, and so on. Informative part makes passwords not completely random. This means that statistical information about the features of the used in practice passwords language can accelerate the process of information systems cracking. Thus, when a password is not automatically generated and created by the user, there is a specific threat because of the human factor. There are many ways to implement this threat for the unauthorized access attempts. The research of these methods allows developing rules that prevent such threats. In this paper, we review existent methods of authentication systems cracking and present the modification of the algorithm that optimizes the cracking of a password based on using of information about the statistics of the actual use of passwords. In addition, paper contains the concrete example of algorithm work and analysis of its efficiency. The algorithm can be used for testing the security of password systems, pentesting.

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Keywords Information security; entropy; dictionary attack.
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