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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">mathnas</journal-id><journal-title-group><journal-title xml:lang="ru">Труды Института математики НАН Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Institute of Mathematics of the NAS of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1812-5093</issn><publisher><publisher-name>Институт математики НАН Беларуси</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mathnas-39</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>АЛГЕБРА И ТЕОРИЯ ЧИСЕЛ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ALGEBRA AND NUMBER THEORY</subject></subj-group></article-categories><title-group><article-title>Фундаментальная область в специальной линейной группе $SL_2(\mathbb{F}_p[x])$ и схема разделения секрета на ее основе</article-title><trans-title-group xml:lang="en"><trans-title>A fundamental domain in the special linear group $SL_2(\mathbb{F}_p[x])$ and secret sharing  on its basis</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Матвеев</surname><given-names>Г. B.</given-names></name><name name-style="western" xml:lang="en"><surname>Matveev</surname><given-names>G. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">matveev47@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Осиновская</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Osinovskaya</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">anna@im.bas-net.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Янчевский</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Yanchevskii</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">yanch@im.bas-net.by</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт математики НАН Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>03</day><month>03</month><year>2025</year></pub-date><volume>32</volume><issue>2</issue><fpage>7</fpage><lpage>16</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Матвеев Г.B., Осиновская А.А., Янчевский В.И., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Матвеев Г.B., Осиновская А.А., Янчевский В.И.</copyright-holder><copyright-holder xml:lang="en">Matveev G.V., Osinovskaya A.A., Yanchevskii V.I.</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://mathnas.ejournal.by/jour/article/view/39">https://mathnas.ejournal.by/jour/article/view/39</self-uri><abstract><p>Решается задача по разработке математических основ модулярного разделения секрета в специальной линейной группе над кольцом многочленов от одной переменной над конечным полем Галуа из $p$ элементов. К схемам разделения секрета предъявляется большое число требований: совершенность и идеальность схемы, возможность проведения верификации, изменение порога без участия дилера, реализация непороговой структуры доступа и некоторые другие. Каждая разработанная к настоящему времени схема разделения секрета не в полной мере удовлетворяет всем этим требованиям. Разработка схемы на новой математической основе призвана расширить список этих конфигураций, что создает для пользователя больше возможностей в выборе оптимального варианта. В специальной линейной группе размерности 2 над кольцом многочленов строится фундаментальная область относительно действия главной конгруэнц-подгруппы правыми сдвигами. На этой основе предложены способы модулярного порогового разделения секрета и его восстановления.</p></abstract><trans-abstract xml:lang="en"><p>The problem of developing the mathematical foundations of modular secret sharing in the special linear group over the ring of polynomials in one variable over the finite Galois field with $p$ elements is being solved. Secret sharing schemes should meet a large number of requirements: perfectness and ideality of a scheme, possibility of verification, changing a threshold without participation of a dealer, implementation of a non-threshold access structure and some others. Every secret sharing scheme developed to date does not fully satisfy all these requirements. The development of a scheme on a new mathematical basis is intended to expand the list of these configurations, thereby creating more possibilities for a user to choose the optimal option. A fundamental domain with respect to the action of the main congruence subgroup by right shifts in the special linear group of dimension 2 over the ring of polynomials is constructed. On this basis, methods for modular threshold secret sharing and its reconstruction are proposed.</p><p> </p></trans-abstract><kwd-group xml:lang="ru"><kwd>специальная линейная группа</kwd><kwd>конгруэнц-подгруппа</kwd><kwd>фундаментальная область</kwd><kwd>модулярное разделение секрета</kwd><kwd>пороговая структура доступа</kwd></kwd-group><kwd-group xml:lang="en"><kwd>a special linear group</kwd><kwd>a congruence subgroup</kwd><kwd>a fundamental domain</kwd><kwd>modular secret sharing</kwd><kwd>a threshold access structure</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Государственной программы научных исследований «Конвергенция-2025», задание 1.1.01.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Cramer R., Damgard I., Nielsen J. 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