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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18255/1818-1015-2019-2-229-243</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-1215</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Theory of Data</subject></subj-group></article-categories><title-group><article-title>Система распределения ключей на дизайнах</article-title><trans-title-group xml:lang="en"><trans-title>Key Distribution System Based on Hadamard Designs</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8258-2419</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Деундяк</surname><given-names>Владимир Михайлович</given-names></name><name name-style="western" xml:lang="en"><surname>Deundyak</surname><given-names>Vladimir M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кандидат физико-математических наук, доцент ЮФУ.</p><p>Ул. Большая Садовая, 105/42, Ростов-на-Дону, 344006; Пер. Газетный, 51, Ростов-на-Дону, 344002</p></bio><bio xml:lang="en"><p>PhD SFU.</p><p>105/42 Bolshaya Sadovaya str., Rostov-on-Don 344006; 51 Gazetniy lane, Rostov-on-Don 344002</p></bio><email xlink:type="simple">vl.deundyak@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1357-9360</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Таран</surname><given-names>Алексей Александрович</given-names></name><name name-style="western" xml:lang="en"><surname>Taran</surname><given-names>Alexey A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Аспирант.</p><p>Ул. Большая Садовая, 105/42, Ростов-на-Дону, 344006</p></bio><bio xml:lang="en"><p>Graduate student.</p><p>105/42 Bolshaya Sadovaya str., Rostov-on-Don 344006</p></bio><email xlink:type="simple">fraktal-at@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Южный Федеральный Университет; ФГНУ НИИ «Спецвузавтоматика»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Southern Federal University; FGNU NII "Specvuzavtomatika"</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Южный Федеральный Университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Southern Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>28</day><month>06</month><year>2019</year></pub-date><volume>26</volume><issue>2</issue><fpage>229</fpage><lpage>243</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Деундяк В.М., Таран А.А., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Деундяк В.М., Таран А.А.</copyright-holder><copyright-holder xml:lang="en">Deundyak V.M., Taran A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.mais-journal.ru/jour/article/view/1215">https://www.mais-journal.ru/jour/article/view/1215</self-uri><abstract><p>Изучается актуальная задача распределения ключей в сообществе для обеспечения безопасности переписки между ее участниками. Для решения этой задачи могут рассматриваться системы предварительного распределения ключей в сообществе, при этом каждый пользователь получает некоторую ключевую информацию, на основе которой он затем может независимо от других участников системы вычислить необходимые общие секретные ключи для тех конференций, в которые он входит. Такие системы предварительного распределения ключей могут быть основаны на разных базовых структурах, в частности, на помехоустойчивых кодах и комбинаторных дизайнах. Слабостью подобных систем является возможность проведения коалиционных атак, когда недобросовестные пользователи системы могут объединиться в коалицию и на основе всей имеющейся у них ключевой информации попытаться вычислить общие секретные ключи других участников сообщества. Однако системой гарантируется безопасность ключей в случае, если мощность коалиции злоумышленников не превышает некоторого значения, которое определяется конструкцией системы.</p><p>В работе рассматривается разработанная нами система распределения ключей, основанная на комбинаторных дизайнах, а именно на 3-дизайнах Адамара, гарантирующая безопасность переписки пользователей при наличии коалиции из не более чем двух злоумышленников. Для исследования стойкости системы к коалиционным атакам в случае превышения предусмотренного значения мощности коалиции вводятся новые понятия комбинаторной оболочки и комбинаторного ранга подмножества кода Адамара и изучаются некоторые комбинаторные свойства кодов Адамара. Для построенной системы распределения ключей вычисляется вероятность успешного проведения коалиционной атаки на произвольную конференцию в зависимости от мощности коалиции злоумышленников.</p></abstract><trans-abstract xml:lang="en"><p>The problem of key distribution in a community for providing secure communication between its participants is studied. To solve this problem, key predistribution systems can be used, in which each user receives some key information that can later be used to independently calculate required shared secret keys for conferences they participate in. Such key distribution systems can be based on different structures, such as error-correcting codes and combinatorial designs. The drawback of such systems is the possibility of collusive attacks, when traitors within the system can form a coalition and use their key information to try to calculate shared secret keys of other users. But the secrecy of keys is guaranteed by the system when the number of traitors in the coalition does not exceed a threshold defined by the system structure. In this paper, a key distribution system is based on combinatorial designs and, in particular, on Hadamard 3-design that guarantees the secrecy of communications in the presence of coalitions with less than three users. New notions of combinatorial span and combinatorial rank of a subset of Hadamard code that are required for the study of the resilience of the system to collusive attacks are introduced. The probability of successful collusive attack on an arbitrary conference against the cardinality of coalition is calculated for this system.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>системы распределения ключей</kwd><kwd>комбинаторные дизайны</kwd><kwd>коалиционные атаки</kwd></kwd-group><kwd-group xml:lang="en"><kwd>key distribution systems</kwd><kwd>combinatorial designs</kwd><kwd>collusive attacks</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Шнайер Б., Прикладная криптография. 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