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入学希望の方 修了生の方 企業・研究者の方 教職員・学生 //--> Sitemap Access Japanese About GSISMessage from the DeanIntroduction to GSISGSIS guide bookOrganizationSNSJournal: Interdisciplinary Information SciencesContactsFacultyLaboratories by DepartmentComputer and Mathematical SciencesSystem Information SciencesHuman-Social Information SciencesApplied Information SciencesLaboratories by Specialized Subject GroupColaborative LaboratoriesPromotion OfficeAdmissionEntrance ExaminationCurriculum and Qualifications for ApplicationResearch StudentDormitoryFor StudentsSyllabus / Time table / Student HandbookNoticeInternational StudentsScholarshipDormitoryAdmission fee / Tuition fee waiverHandbook for International StudentsJapanese Language ProgramCounseling servicesEmergency InformationInternal Access Only Home Faculty Laboratories by Department Information Security Computer and Mathematical Sciences Information Security A16 Prof. Minoru Kuribayashi Assoc. Prof. Masao Sakai     Assoc. Prof. Shuji Isobe   Assis. Prof. Eisuke Koizumi     Lab's Web page Keywordscomputational complexity theory, reduction, public-key cryptosystem, cryptographic assumption, forensic technology, AI security, blockchain Theory and Application of Information security The main research subjects of the laboratory are on the theory of information and multimedia security and their applications, which also involves related mathematics: combinatorics, computational complexity theory, algebra, geometry, statistical analysis, signal processing, and so on. We are currently interested in the following:   (1) Computational Complexity Theory In the computational complexity theory, we classify various computational problems according to the difficulty of solving them and analyze reduction relationships among the problems. We study the complexity of various computational problems from a standpoint of the cryptologic research.   (2) Security of Cryptographic Systems The security of public-key cryptosystems depends on some computational problems that are presumably hard to solve. We are interested in the complexity of such primitive problems.   (3) Defense Technologies to Infordemics AI technologies developed in a data-driven manner are, unfortunately, accompanied by the emergence of new threats called Infordemics. We are considering to investigate defensive technologies against disinformation and to strengthen its efforts to society’s DX Transformation. We are also working on the development and evaluation of secure blockchain applications. Reductions among Cryptographic Primitives A Concept of Content Credentials FacultyLaboratories by DepartmentComputer and Mathematical SciencesSystem Information SciencesHuman-Social Information SciencesApplied Information SciencesLaboratories by Specialized Subject GroupColaborative LaboratoriesPromotion Office GSIS: Graduate School of Information Sciences, Tohoku University 6-3-09 Aoba, Aramaki-aza Aoba-ku, Sendai, 980-8579, Japan Phone.+81-22-795-5813 Fax. +81-22-795-5815 Contacts is-www-admin,is.tohoku.ac.jp --> About GSIS Message from the DeanIntroduction to GSISGSIS guide bookOrganizationSNSJournal: Interdisciplinary Information SciencesContacts Faculty Laboratories by DepartmentComputer and Mathematical SciencesSystem Information SciencesHuman-Social Information SciencesApplied Information SciencesLaboratories by Specialized Subject GroupColaborative LaboratoriesPromotion Office Admission Entrance ExaminationCurriculum and Qualifications for ApplicationResearch StudentDormitory For Students Syllabus / Time table / Student HandbookNoticeInternational StudentsScholarshipDormitoryAdmission fee / Tuition fee waiverHandbook for International StudentsJapanese Language ProgramCounseling servicesEmergency InformationInternal Access Only About this Website Link © 2016 Graduate School of Information Sciences, Tohoku University About GSIS Message from the DeanIntroduction to GSISGSIS guide bookOrganizationSNSJournal: Interdisciplinary Information SciencesContacts Faculty Laboratories by DepartmentComputer and Mathematical SciencesSystem Information SciencesHuman-Social Information SciencesApplied Information SciencesLaboratories by Specialized Subject GroupColaborative LaboratoriesPromotion Office Admission Entrance ExaminationCurriculum and Qualifications for ApplicationResearch StudentDormitory For Students Syllabus / Time table / Student HandbookNoticeInternational StudentsScholarshipDormitoryAdmission fee / Tuition fee waiverHandbook for International StudentsJapanese Language ProgramCounseling servicesEmergency InformationInternal Access Only Sitemap Access Japanese no cache