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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">vestnovsu</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Новгородского государственного университета</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik of Novgorod State University</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2076-8052</issn><publisher><publisher-name>Новгородский государственный университет имени Ярослава Мудрого</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.34680/2076-8052.2024.3(137).489-497</article-id><article-id custom-type="elpub" pub-id-type="custom">vestnovsu-351</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>РАДИОТЕХНИКА И СВЯЗЬ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RADIOTECHNICS AND TELECOMMUNICATIONS</subject></subj-group></article-categories><title-group><article-title>О симметричной 2-адической сложности чередующихся последовательностей на основе последовательностей Лежандра</article-title><trans-title-group xml:lang="en"><trans-title>About symmetric 2-adic complexity of interleaving sequences based on Legendre sequences</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1368-3827</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Едемский</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Edemskiy</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Едемский Владимир Анатольевич – доктор физико-математических наук, доцент, заведующий кафедрой.</p><p>Великий Новгород</p></bio><bio xml:lang="en"><p>Veliky Novgorod</p></bio><email xlink:type="simple">Vladimir.Edemsky@novsu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-5010-026X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дроганова</surname><given-names>Д. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Droganova</surname><given-names>D. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дроганова Дарья Сергеевна – студент.</p><p>Великий Новгород</p></bio><bio xml:lang="en"><p>Veliky Novgorod</p></bio><email xlink:type="simple">darya.droganova@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Новгородский государственный университет имени Ярослава Мудрого</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Yaroslav-the-Wise Novgorod State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>13</day><month>03</month><year>2025</year></pub-date><volume>0</volume><issue>3(137)</issue><fpage>489</fpage><lpage>497</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Едемский В.А., Дроганова Д.С., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Едемский В.А., Дроганова Д.С.</copyright-holder><copyright-holder xml:lang="en">Edemskiy V.A., Droganova D.S.</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://vestnovsu.elpub.ru/jour/article/view/351">https://vestnovsu.elpub.ru/jour/article/view/351</self-uri><abstract><p>2-адическая сложность, наряду с линейной сложностью, являются важными характеристиками псевдослучайных последовательностей, значимыми для их практических приложений. Для оценки непредсказуемости бинарных последовательностей предпочтительнее симметричная 2-адическая сложность, которая определяется как наименьшая из 2-адической сложности последовательности и 2-адической сложности последовательности, записанной в обратном порядке. В статье исследуется симметричная 2-адическая сложность чередующихся бинарных последовательностей, обладающих высокой линейной сложностью и хорошими автокорреляционными свойствами. Для определения рассматриваемых последовательностей используются циклические сдвиги последовательностей Лежандра и их дополнения. Показано, что для этих последовательностей симметричная 2-адическая сложность близка к максимально возможной и достаточна для отражения атак посредством алгоритма рациональной апроксимации. Метод исследования основан на анализе соотношения между периодической автокорреляционной функции последовательности, значения которой известны, и порождающего многочлена последовательности, инверсной к искомой.</p></abstract><trans-abstract xml:lang="en"><p>2-adic complexity, along with linear complexity, are important characteristics of pseudorandom sequences that are significant for their practical applications. To assess the unpredictability of binary sequences, symmetric 2-adic complexity is preferred, which is defined as the lesser of the 2-adic complexity of the sequence and the 2-adic complexity of the sequence written in reverse order. The article studies the symmetric 2-adic complexity of alternating binary sequences with high linear complexity and good autocorrelation properties. To determine the sequences under consideration, cyclic shifts of Legendre sequences and their complements are used. It is shown that for these sequences the symmetric 2-adic complexity is close to the maximum possible and is sufficient to repel attacks using the rational approximation algorithm. The research method is based on the analysis of the relationship between the periodic autocorrelation function of a sequence, the values of which are known, and the generating polynomial of the sequence, inverse to the desired one.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>бинарные последовательности</kwd><kwd>симметричная 2-адическая сложность</kwd><kwd>чередование последовательностей Лежандра</kwd></kwd-group><kwd-group xml:lang="en"><kwd>binary sequences</kwd><kwd>symmetric 2-adic complexity</kwd><kwd>interleaving Legendre sequences</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Российского научного фонда, проект № 24–21–00442</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">Klapper A., Goresky M. 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