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SM ISO690:2012 BULAT, Mihail, ZGUREANU, Aureliu, CIOBANU, Iacob, CATARANCIUC, Sergiu. Encryption Systems with Wandering Keys. In: Information Technologies and Security: 2012, 15-16 octombrie 2012, Chișinău. Chișinău, Republica Moldova: Consiliul Naţional pentru Acreditare şi Atestare, 2012, pp. 238-246. |
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Information Technologies and Security 2012 | |||||
Conferința "Information Technologies and Security" Chișinău, Moldova, 15-16 octombrie 2012 | |||||
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Pag. 238-246 | |||||
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In this paper is proposed a system of encrypting information, with keys formed of fragments by partial derivatives of nonlinear Boolean functions of n variables, which belong to a set } Ф={F1,F2,…Fg}. These fragments are, so-called, subsets of column, consisting of elements of the set n T= {0,1,…2 t-1} . 2<t<n. Representation of functions by subsets of column allows quickly find the fragments of partial derivatives of functions of a large number (tens and hundreds) of variables. Due to this encryption keys can be quickly replaced as the transition from one message to another, as well as during the message, without essential changing the information processing speed but increasing concomitant security of the system. The security of this encryption system are based on the difficult calculation of Boolean functions if are known only some fragments of its partial derivatives. The functions in are represented in disjunctive normal form. Are developed formulas for determination of fragments of partial derivatives, that are represented by multidimensional matrices. These formulas are obtained based on some new properties of subsets of column and of partial derivatives of functions from the set Ф . |
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Cuvinte-cheie encryption, system, key, private, function, derivatives, matrices, public, Boolean |
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