Information and Computation最新文献

{"title":"Identity based proxy blind signature scheme using NTRU lattices","authors":"Sonika Singh ,&nbsp;Swati Rawal ,&nbsp;Sahadeo Padhye ,&nbsp;Namita Tiwari","doi":"10.1016/j.ic.2025.105284","DOIUrl":"10.1016/j.ic.2025.105284","url":null,"abstract":"<div><div>Proxy blind signatures represent a specific type of blind signature that allows a proxy signer to sign documents on behalf of the original signer without having access to the content they are signing. Currently, most of the existing proxy blind signature schemes rely on complex number-theoretic hard problems like bilinear pairing and the discrete logarithm problem or on general lattices' hardness. Unfortunately, the security of number-theoretic hard problems-based systems is struggling due to vulnerability to Shor's algorithm, which jeopardizes the security of cryptographic schemes based on them, and general lattices suffer from large key sizes. Thus, we are looking for a new scheme that is efficient in time and storage, has short key and signature sizes, and is crucially secure against threats posed by quantum computers. Recently, NTRU lattice-based schemes have gained significant popularity due to their ease of implementation and proven security reductions. In 2018, Zhu et al. presented an identity-based proxy blind signature scheme over NTRU lattices, which is not secure. Therefore, by explaining the security breach of Zhu et al.'s scheme, we present a novel, secure, and improved identity-based proxy blind signature system resistant to quantum threats and utilizing NTRU lattices. Based on the standard hardness assumptions related to the approximate shortest vector problem (<em>γ</em>-SVP) and the shortest integer solution problem (SIS), it is demonstrated that the proposed method is secure against quantum forgery.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"304 ","pages":"Article 105284"},"PeriodicalIF":0.8,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143488796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Composing bridges","authors":"Mugurel Barcau ,&nbsp;Vicenţiu Paşol ,&nbsp;George C. Ţurcaş","doi":"10.1016/j.ic.2025.105285","DOIUrl":"10.1016/j.ic.2025.105285","url":null,"abstract":"<div><div>The present work builds on previous investigations of the authors (and their collaborators) regarding bridges, a certain type of morphisms between encryption schemes, making a step forward in developing a (category theory) language for studying relations between encryption schemes. Here we analyse the conditions under which bridges can be performed sequentially, formalizing the notion of composability. One of our results gives a sufficient condition for a pair of bridges to be composable. We illustrate that composing two bridges, each independently satisfying a previously established IND-CPA security definition, can actually lead to an insecure bridge. Our main result gives a sufficient condition that a pair of secure composable bridges should satisfy in order for their composition to be a secure bridge. We also introduce the concept of a <em>complete</em> bridge and show that it is connected to the notion of Fully composable Homomorphic Encryption (FcHE), recently considered by Micciancio. Moreover, we show that a result of Micciancio which gives a construction of FcHE schemes can be phrased in the language of complete bridges, where his insights can be formalized in a greater generality.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"304 ","pages":"Article 105285"},"PeriodicalIF":0.8,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computing maximal palindromes in non-standard matching models","authors":"Takuya Mieno ,&nbsp;Mitsuru Funakoshi ,&nbsp;Yuto Nakashima ,&nbsp;Shunsuke Inenaga ,&nbsp;Hideo Bannai ,&nbsp;Masayuki Takeda","doi":"10.1016/j.ic.2025.105283","DOIUrl":"10.1016/j.ic.2025.105283","url":null,"abstract":"<div><div><em>Palindromes</em> are popular and important objects in textual data processing, bioinformatics, and combinatorics on words. Let <span><math><mi>S</mi><mo>=</mo><mi>X</mi><mi>a</mi><mi>Y</mi></math></span> be a string where <em>X</em> and <em>Y</em> are of the same length, and <em>a</em> is either a single character or the empty string. Then, there exist two alternative definitions for palindromes: <em>S</em> is said to be a palindrome if <em>S</em> is equal to its reversal <span><math><msup><mrow><mi>S</mi></mrow><mrow><mi>R</mi></mrow></msup></math></span> (Reversal-based definition); or if its right-arm <em>Y</em> is equal to the reversal of its left-arm <span><math><msup><mrow><mi>X</mi></mrow><mrow><mi>R</mi></mrow></msup></math></span> (Symmetry-based definition). It is clear that if the “equality” (≈) used in both definitions is exact character matching (=), then the two definitions are the same. However, if we apply other string-equality criteria ≈, including the <em>complementary-matching model</em> for biological sequences, the <em>Cartesian-tree model</em> [Park et al., TCS 2020], the <em>parameterized model</em> [Baker, JCSS 1996], the <em>order-preserving model</em> [Kim et al., TCS 2014], and the <em>palindromic-structure model</em> [I et al., TCS 2013], then are the reversal-based palindromes and the symmetry-based palindromes the same? To the best of our knowledge, no previous work has considered or answered this natural question. In this paper, we first provide answers to this question, and then present efficient algorithms for computing all <em>maximal palindromes under the non-standard matching models</em> in a given string. After confirming that Gusfield's offline suffix-tree-based algorithm for computing maximal symmetry-based palindromes can be readily extended to the aforementioned matching models, we show how to extend Manacher's online algorithm for computing maximal reversal-based palindromes in linear time for all the aforementioned matching models.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"304 ","pages":"Article 105283"},"PeriodicalIF":0.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polynomial-delay enumeration of large maximal common independent sets in two matroids and beyond","authors":"Yasuaki Kobayashi ,&nbsp;Kazuhiro Kurita ,&nbsp;Kunihiro Wasa","doi":"10.1016/j.ic.2025.105282","DOIUrl":"10.1016/j.ic.2025.105282","url":null,"abstract":"<div><div>Finding a <em>maximum</em> cardinality common independent set in two matroids (also known as <span>Matroid Intersection</span>) is a classical combinatorial optimization problem, which generalizes several well-known problems, such as finding a maximum bipartite matching, a maximum colorful forest, and an arborescence in directed graphs. Enumerating all <em>maximal</em> common independent sets in two (or more) matroids is a classical enumeration problem. In this paper, we address an “intersection” of these problems: Given two matroids and a threshold <em>τ</em>, the goal is to enumerate all maximal common independent sets in the matroids with cardinality at least <em>τ</em>. We show that this problem can be solved in polynomial delay and polynomial space. Moreover, our technique can be extended to a more general problem, which is relevant to <span>Matroid Matching</span>. We give a polynomial-delay and polynomial-space algorithm for enumerating all maximal “matchings” with cardinality at least <em>τ</em>, assuming that the optimization counterpart is “tractable” in a certain sense. This extension allows us to enumerate small minimal connected vertex covers in subcubic graphs. We also discuss a framework to convert enumeration with cardinality constraints into ranked enumeration.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"304 ","pages":"Article 105282"},"PeriodicalIF":0.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Homogeneous spiking neural P systems with synaptic failure","authors":"Luping Zhang ,&nbsp;Tingfang Wu","doi":"10.1016/j.ic.2025.105281","DOIUrl":"10.1016/j.ic.2025.105281","url":null,"abstract":"<div><div>Spiking neural P (SN P) systems are a class of neural-like computational models, inspired by the way biological neurons process information through electrical impulses known as spikes. Homogeneous spiking neural P (HSN P) systems are a specialized variant of SN P systems, where all neurons share the same set of rules. In this work, with the biological inspiration that excessive synaptic transmission can lead to short-term failures in signal delivery between neurons in neural systems, the notion of synaptic failure is considered in HSN P systems, termed HSN P systems with synaptic failure (HSNPSF systems). Specifically, synaptic failure is referred to a family of sets of failure-prone synapses: if spikes simultaneously pass along all the synapses in such a set, the transmitted spikes across the synapses are suppressed; if a synapse in the set does not transmit any spike, the spikes pass along the synapses at that time, ultimately reaching the destination neurons. The computational power of HSNPSF systems is investigated by proving that they can achieve computational completeness both in generating and accepting modes. Furthermore, the computational efficiency of HSNPSF systems is examined, and it is demonstrated that with the help of non-deterministic feature, these systems are capable of solving <strong>NP</strong>-complete (the Subset Sum) problem in a semi-uniform way and within constant time.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"304 ","pages":"Article 105281"},"PeriodicalIF":0.8,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the computational power of energy-constrained mobile robots","authors":"Kevin Buchin ,&nbsp;Paola Flocchini ,&nbsp;Irina Kostitsyna ,&nbsp;Tom Peters ,&nbsp;Nicola Santoro ,&nbsp;Koichi Wada","doi":"10.1016/j.ic.2025.105280","DOIUrl":"10.1016/j.ic.2025.105280","url":null,"abstract":"<div><div>We consider distributed systems of autonomous robots operating in the plane under synchronous <em>Look</em>-<em>Compute</em>-<em>Move</em> (<em>LCM</em>) cycles. Prior research on four distinct models assumes robots have unlimited energy. We remove this assumption and investigate systems where robots have limited but renewable energy, requiring inactivity for energy restoration.</div><div>We analyze the computational impact of this constraint, fully characterizing the relationship between energy-restricted and unrestricted robots. Surprisingly, we show that energy constraints can enhance computational power.</div><div>Additionally, we study how memory persistence and communication capabilities influence computation under energy constraints. By comparing the four models in this setting, we establish a complete characterization of their computational relationships.</div><div>A key insight is that energy-limited robots can be modeled as unlimited-energy robots controlled by an adversarial activation scheduler. This provides a novel equivalence framework for analyzing energy-constrained distributed systems.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"303 ","pages":"Article 105280"},"PeriodicalIF":0.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On regular trees defined from unfoldings and coverings","authors":"Bruno Courcelle","doi":"10.1016/j.ic.2025.105278","DOIUrl":"10.1016/j.ic.2025.105278","url":null,"abstract":"<div><div>We study the infinite trees that arise, first as <em>complete unfoldings</em> of finite weighted directed graphs, and second, as <em>universal coverings</em> of finite weighted undirected graphs. They are respectively the <em>regular</em> rooted trees and the <em>strongly regular</em> trees, a new notion. A rooted tree is <em>regular</em> if it has finitely many subtrees up to isomorphism. A tree (without root) is <em>strongly regular</em> if it has finitely many rooted trees, up to isomorphism, obtained by taking each of its nodes as a root. We prove the first-order definability of each regular or strongly regular tree with respect to the class of trees (that is not itself first-order definable). We characterize the strongly regular trees among the regular ones and we establish several decidability results.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"303 ","pages":"Article 105278"},"PeriodicalIF":0.8,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143299267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Consistent query answering in multi-relation databases","authors":"Dominique Laurent ,&nbsp;Nicolas Spyratos","doi":"10.1016/j.ic.2025.105279","DOIUrl":"10.1016/j.ic.2025.105279","url":null,"abstract":"<div><div>Traditionally, to verify the consistency of a multi-relation database with respect to a set of functional dependencies, one applies the well-known Chase algorithm, which derives new tuples as long as no conflict with some dependency arises. Therefore, the Chase algorithm uses dependencies both as inference rules and as tools to check consistency. If no conflicts occur, the database is declared consistent else inconsistent. If the database is consistent then query answering proceeds as usual, otherwise extracting consistent information from the inconsistent database is an issue, known as consistent query answering.</div><div>To address this issue, we consider the set <span><math><mi>T</mi></math></span> of all tuples built from constants occurring in the database, and we use set theoretic semantics to characterize tuples in <span><math><mi>T</mi></math></span> in two orthogonal ways: true/false and conflicting/non-conflicting. Calling ‘consistent’ a tuple which is true and non-conflicting, a ‘repair’ is defined to be a maximal subset of true tuples that satisfies the dependencies and in which as many consitent tuples as possible are true. A query <em>Q</em> is of the form <span>select</span> <em>X</em> <span>where</span> <span><math><mi>C</mi><mi>o</mi><mi>n</mi><mi>d</mi><mi>i</mi><mi>t</mi><mi>i</mi><mi>o</mi><mi>n</mi></math></span>, and a tuple <em>x</em> of <span><math><mi>T</mi></math></span> is in the consistent answer of <em>Q</em> if <em>x</em> is in the answer of <em>Q</em> in every repair.</div><div>Our main contributions are: (a) a novel approach to consistent query answering in multi-relation databases; (b) a modified Chase algorithm to compute true/false and conflicting/non-conflicting tuples; (c) for acyclic functional dependencies, a polynomial-time algorithm computing the exact or approximate consistent answers; (d) a detailed discussion comparing our approach with other related approaches.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"303 ","pages":"Article 105279"},"PeriodicalIF":0.8,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The computational properties of P systems with mutative membrane structures","authors":"Bosheng Song ,&nbsp;Chuanlong Hu ,&nbsp;David Orellana-Martín ,&nbsp;Antonio Ramírez-de-Arellano ,&nbsp;Mario J. Pérez-Jiménez ,&nbsp;Xiangxiang Zeng","doi":"10.1016/j.ic.2025.105277","DOIUrl":"10.1016/j.ic.2025.105277","url":null,"abstract":"<div><div>Membrane computing is a subfield of nature-inspired computing studying computational models named <em>P systems</em>, where several rules (division rules, dissolving rules, merging rules, creation rules, separation rules, etc) for evolving the membrane structure were considered in many variants of P systems, and most of these variants employ at most two of these types of rules. In this article, we combine budding rules, fusion rules, dissolving rules, division rules (both for non-elementary membrane and elementary membranes), therefore a mutative type of P systems, termed <em>cell-like P systems with mutative membrane structures</em> (CMMS P systems) are defined. We discuss the computational properties of CMMS P systems. More specifically, CMMS P systems are shown to be Turing universal by integrating some types of rules. Moreover, we prove that CMMS P systems can also effectively solve the <span>SAT</span> problem.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"303 ","pages":"Article 105277"},"PeriodicalIF":0.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metric quantifiers and counting in timed logics and automata","authors":"Hsi-Ming Ho ,&nbsp;Khushraj Madnani","doi":"10.1016/j.ic.2025.105268","DOIUrl":"10.1016/j.ic.2025.105268","url":null,"abstract":"<div><div>We study the expressiveness of the <em>pointwise</em> interpretations (i.e. over timed words) of some predicate and temporal logics with metric and counting features. We show that counting in the unit interval <span><math><mo>(</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>)</mo></math></span> is strictly weaker than counting in <span><math><mo>(</mo><mn>0</mn><mo>,</mo><mi>b</mi><mo>)</mo></math></span> with arbitrary <span><math><mi>b</mi><mo>≥</mo><mn>0</mn></math></span>; moreover, allowing the latter to be included in temporal logics leads to expressive completeness for the metric predicate logic <span>Q2MLO</span>, recovering the corresponding result for the continuous interpretations (i.e. over signals). Exploiting this connection, we show that in contrast to the continuous case, adding ‘punctual’ predicates into <span>Q2MLO</span> is still insufficient for the full expressive power of the Monadic First-Order Logic of Order and Metric (<span>FO[</span><span><math><mo>&lt;</mo><mo>,</mo><mo>+</mo><mn>1</mn></math></span><span>]</span>); as a remedy, we propose a generalisation of the recently proposed Pnueli automata modalities and show that the resulting metric temporal logic is expressively complete for <span>FO[</span><span><math><mo>&lt;</mo><mo>,</mo><mo>+</mo><mn>1</mn></math></span><span>]</span>. On the practical side, we propose a <em>compositional</em> construction from metric interval temporal logic with counting or similar extensions to timed automata, which is more amenable to implementation based on existing tools that support on-the-fly model checking.</div></div>","PeriodicalId":54985,"journal":{"name":"Information and Computation","volume":"303 ","pages":"Article 105268"},"PeriodicalIF":0.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}