Инд. авторы:	Ryabko Boris, Ryabko Daniil
Заглавие:	Constructing perfect steganographic systems
Библ. ссылка:	Ryabko Boris, Ryabko Daniil Constructing perfect steganographic systems // Information and Computation. - 2011. - Vol.209. - Iss. 9. - P.1223-1230. - ISSN 0890-5401. - EISSN 1090-2651.
Внешние системы:	DOI: 10.1016/j.ic.2011.06.004; РИНЦ: 18058226; WoS: 000294315300002;
Реферат:	eng: We propose steganographic systems for the case when covertexts (containers) are generated by a finite-memory source with possibly unknown statistics. The probability distributions of covertexts with and without hidden information are the same; this means that the proposed stegosystems are perfectly, secure. i.e. an observer cannot determine whether hidden information is being transmitted. The speed of transmission of hidden information can be made arbitrary close to the theoretical limit - the Shannon entropy of the source of covertexts. An interesting feature of the suggested stegosystems is that they do not require any (secret or public) key.At the same time, we outline some principled computational limitations on steganography. We show that there are such sources of covertexts, that any stegosystem that has linear (in the length of the covertext) speed of transmission of hidden text must have an exponential Kolmogorov complexity. This shows, in particular, that some assumptions on the sources of covertext are necessary. (C) 2011 Elsevier Inc. All rights reserved.
Издано:	2011
Физ. характеристика:	с.1223-1230