caa a22 4500 378875396 CHVBK 20180305123419.0 cr unu---uuuuu 161128e20030701xx s 000 0 eng 10.1515/156939203322385856 doi (NATIONALLICENCE)gruyter-10.1515/156939203322385856 Estimation of the time needed to set up a covert channel [Elektronische Daten] [A. A. Grusho, E. E. Timonina] In this study, we construct the mathematical model of a covert channel of agent interaction in the wide area network and in a closed segment of a local area network. The channel transmits information through an IPsec-based protective device with the use of encapsulation and enciphering of packets. We analyse the asymptotic behaviour of the time needed to learn the agent the language of information transmission. We prove that if the number n of nodes in an arbitrary segment and the number m of segments grow without limits, then the learning time is O(m2n ln n) under some conditions. Copyright 2003, Walter de Gruyter Grusho A. A. aut Timonina E. E. aut Discrete Mathematics and Applications Walter de Gruyter 13/3(2003-07-01), 257-263 0924-9265 13:3<257 2003 13 dma https://doi.org/10.1515/156939203322385856 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/156939203322385856 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grusho A. A. aut NATIONALLICENCE 700 1- Timonina E. E. aut NATIONALLICENCE 773 0- Discrete Mathematics and Applications Walter de Gruyter 13/3(2003-07-01), 257-263 0924-9265 13:3<257 2003 13 dma CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter