TOORU NAKANISHI

Last Updated :2025/06/04

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Professor
Web Site
http://home.hiroshima-u.ac.jp/t-nakanishi/index.html
E-mail
t-nakanishihiroshima-u.ac.jp
Self-introduction
My research interests include cryptography and information security, particularly privacy-enhancing technology.

Basic Information

Major Professional Backgrounds

  • 1998/04/01, 2003/11/30, Okayama University, Faculty of Engineering, Research Associate
  • 2003/12/01, 2005/03/31, Okayama University, Faculty of Engineering, Lecturer
  • 2005/04/01, 2006/06/30, Okayama University, Lecturer
  • 2006/07/01, 2014/03/31, Okayama University, Associate Professor
  • 2014/04/01, 2020/03/31, Hiroshima University, Institute of Engineering, Professor
  • 2020/04/01, Hiroshima University, Graduate School of Advanced Science and Engineering, Professor

Academic Degrees

  • Doctor of Engineering, Osaka University
  • Master of Engineering, Osaka University

Educational Activity

  • [Bachelor Degree Program] School of Informatics and Data Science : Department of Informatics and Data Science : Computer Science Program
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Informatics and Data Science Program
  • [Doctoral Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Informatics and Data Science Program

Research Fields

  • Informatics;Computing Technologies;Information security

Affiliated Academic Societies

  • Institute of Electronics, Information and Communication Engineers (IEICE)
    Related URL
  • Information Processing Society of Japan (IPSJ)
    Related URL

Educational Activity

Course in Charge

  1. 2025, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  2. 2025, Undergraduate Education, 2Term, Information Theory
  3. 2025, Undergraduate Education, 1Term, Theory of Computing
  4. 2025, Undergraduate Education, 2Term, Information Society and Security
  5. 2025, Undergraduate Education, 1Term, Computer Science Seminar I
  6. 2025, Undergraduate Education, 2Term, Computer Science Seminar II
  7. 2025, Undergraduate Education, Second Semester, Graduation Thesis
  8. 2025, Graduate Education (Master's Program) , 1Term, Special Exercises on Informatics and Data Science A
  9. 2025, Graduate Education (Master's Program) , 2Term, Special Exercises on Informatics and Data Science A
  10. 2025, Graduate Education (Master's Program) , 3Term, Special Exercises on Informatics and Data Science B
  11. 2025, Graduate Education (Master's Program) , 4Term, Special Exercises on Informatics and Data Science B
  12. 2025, Graduate Education (Master's Program) , Year, Special Study on Informatics and Data Science
  13. 2025, Graduate Education (Doctoral Program) , Year, Special Study on Informatics and Data Science

Research Activities

Academic Papers

  1. Short DL-Based Blacklistable Ring Signatures from DualRing, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E107A(3), 464-475, 202403
    Link to Paper Search Results by DOI
  2. A Strongly Unlinkable Group Signature Scheme with Matching-Based Verifier-Local Revocation for Privacy-Enhancing Crowdsensing, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E106A(12), 1531-1543, 202312
    Link to Paper Search Results by DOI
  3. A Serverless Signaling Scheme for WebRTC Using Bluetooth LE, Eleventh International Symposium on Computing and Networking, CANDAR2023 - Workshops, 303-307, 202311
  4. Zero-Knowledge Proofs of Connectivity for Labeled Directed Graphs Using Bilinear-Map Accumulator, Proceedings - 2023 11th International Symposium on Computing and Networking, CANDAR 2023, 626-632, 202311
    Link to Paper Search Results by DOI
  5. Issuer-Revocable Issuer-Hiding Attribute-Based Credentials Using an Accumulator, Proceedings - 2023 11th International Symposium on Computing and Networking, CANDAR 2023, 93-99, 202311
    Link to Paper Search Results by DOI
  6. Short DL-based Blacklistable Ring Signatures from DualRing, Proceedings - 2022 10th International Symposium on Computing and Networking, CANDAR 2022, 137-143, 202211
  7. A File Sharing Method Using a Delay Tolerant Network in Daily Life, IEEE Region 10 Annual International Conference, Proceedings/TENCON, 202211
  8. An Efficient Anonymous Reputation System for Crowdsensing, Journal of Information Processing, 30, 694-705, 202210
  9. An Efficient Revocable Delegatable Anonymous Credential System Using an Accumulator, Journal of Information Processing, 30, 706-717, 202210
  10. Efficient Zero-Knowledge Proofs of Graph Signature for Connectivity and Isolation Using Bilinear-Map Accumulator, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E105A(3), 389-403, 202203
    Link to Paper Search Results by DOI
  11. Reducing Revocation Lists in CS-Based Revocable Group Signature Scheme Using Vector Commitment, Proc. CANDAR2021, 175-181, 202111
  12. A Strongly Unlinkable Group Signature Scheme with Matching-Based Verifier-Local Revocation for Privacy-Enhancing Crowdsensing, Proc. CANDAR2021, 141-147, 202111
  13. A New Structure of 2-State Number-Conserving Cellular Automata, IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, E104D(5), 673-678, 202105
    Link to Paper Search Results by DOI
  14. Efficient Zero-Knowledge Proofs of Graph Signature for Connectivity and Isolation Using Bilinear-Map Accumulator, Proc. 7th ACM Workshop on ASIA Public-Key Cryptography (APKC2020), 9-18, 20201005
  15. An Anonymous Credential System with Constant-Size Attribute Proofs for CNF Formulas with Negations, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E103A(12), 1381-1392, 202012
    Link to Paper Search Results by DOI
  16. An Accumulator-Based Revocation in Delegatable Anonymous Credentials, Proc. 7th International Workshop on Information and Communication Security (WICS'21), 314-320, 202012
  17. Efficient blacklistable anonymous credential system with reputation using a pairing-based accumulator, IET INFORMATION SECURITY, 14(6), 613-624, 202011
    Link to Paper Search Results by DOI
  18. Speeding Up Revocable Group Signature with Compact Revocation List Using Vector Commitments, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E102A(12), 1676-1687, 201912
    Link to Paper Search Results by DOI
  19. ★, An Efficient Blacklistable Anonymous Credentials without TTP of Tracing Authority Using Pairing-Based Accumulator, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E102A(12), 1968-1979, 201912
    Link to Paper Search Results by DOI
  20. An Efficient Anonymous Reputation System for Crowd Sensing, Proc. 6th International Workshop on Information and Communication Security (WICS 2019), 374-380, 201912
  21. Efficiency Improvement in Group Signature Scheme with Probabilistic Revocation, Journal of Information Processing, 27, 508-516, 201912
  22. An Anonymous Credential System with Constant-Size Attribute Proofs for CNF Formulas with Negations, Proc. 14th International Workshop on Security (IWSEC 2019), LNCS 11689, 89-106, 201908
  23. Speeding Up Revocable Group Signature with Compact Revocation List Using Vector Commitments, Sixth International Symposium on Computing and Networking (CANDAR 2018), 160-166, 201811
  24. Efficiency Improvement in Group Signature Scheme with Probabilistic Revocation, 2018 International Symposium on Information Theory and Its Applications (ISITA 2018), 80-84, 201810
  25. An Efficient Blacklistable Anonymous Credential System with Reputation Using Pairing-based Accumulator, 17th IEEE International Conference on Trust, Security and Privacy in Computing and Communications (IEEE TrustCom-18), 1140-1148, 201808
  26. Accumulator for Monotone Formulas and its Application to Anonymous Credential System, Journal of Information Processing, 25, 949-961, 201712
  27. Implementation of Revocable Group Signatures with Compact Revocation List Using Vector Commitments, CANDAR-WICS 2017, 489-495, 201711
  28. Designated-Senders Public-Key Searchable Encryption Secure against Keyword Guessing Attacks, CANDAR-WICS 2017, 496-502, 201711
  29. Hierarchical Motion Representation of 2-State Number Conserving Cellular Automata, CANDAR-AFCA 2017, 194-199, 201711
  30. Revocable Group Signatures with Compact Revocation List Using Vector Commitments, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E100A(8), 1672-1682, 201708
    Link to Paper Search Results by DOI
  31. An Efficient Blacklistable Anonymous Credentials without TTPs Using Pairing-Based Accumulator, AINA2017, 780-786, 201703
  32. A Secure Data Exchange System in Wireless Delay Tolerant Network Using Attribute-Based Encryption, Journal of Information Processing, 25, 234-243, 201702
  33. Implementation of a Revocable Group Signature Scheme with Compact Revocation List Using Accumulator, Proc. CANDAR2016-WICS, 610-615, 201611
  34. Revocable Group Signatures with Compact Revocation List Using Vector Commitments, Proc. 17th World Conference on Information Security Applications (WISA 2016), LNCS 10144, 245-257, 201608
  35. Reduction of Certificates in an Anonymous Credential System with Proofs for Monotone Formulas on Attributes, Proc. 2016 IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW), 201605
  36. An implementation of Secure Data Exchange System with Multi-hop Routing in Wireless Delay Tolerant Network Using Attribute-Based Encryption, Proc. CANDAR, 2nd International Workshop on Information and Communication Security (WICS 2015), 536-542, 201512
  37. Anonymous Credential System with Efficient Proofs for Monotone Formulas on Attributes, Proc. 10th International Workshop on Security (IWSEC 2015), LNCS 9241, 262-278, 201508
  38. Reduction of Authentication Time in an Anonymous Credential System with Proofs for Monotone Formulas on Attributes, Proc. 2015 IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW 2015), 376-377, 201506
  39. Revocable Group Signatures with Compact Revocation List Using Accumulators, IEICE Trans. Fundamentals, E98-A(1), 117-131, 201501
  40. Extensions of Access-Point Aggregation Algorithm for Large-scale Wireless Local Area Networks, International Journal of Networking and Computing, 5(1), 200-222, 201501
  41. An Anonymous Reputation System with Reputation Secrecy for Manager, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E97A(12), 2325-2335, 201412
    Link to Paper Search Results by DOI
  42. Implementation of Anonymous Credential System with Efficient Proofs for Monotone Formulas on Attributes Excluding Restriction, Proc. of CANDAR’14, the 1st International Workshop on Information and Communication Security (WICS), 531-535, 201412
  43. An Implementation of Secure Data Exchange in Wireless Delay Tolerant Network Using Attribute-Based Encryption, Proc. of CANDAR’14, the 1st International Workshop on Information and Communication Security (WICS), 536-542, 201412
  44. An Implementation of Mobile Anonymous Attribute Authentication for Android Devices, Proc. of 2014 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW2014), 47-48, 201405
  45. A Proposal of Routing Algorithm under Practical Conditions for Wireless Internet-Access Mesh Networks, Proc. of 2014 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW2014), 27-28, 201405
  46. Efficient Proofs for CNF Formulas on Attributes in Pairing-Based Anonymous Credential System, IEICE Trans. Fundamentals, E96-A(12), 2422-2433, 201312
  47. Revocable Group Signatures with Compact Revocation List Using Accumulators, Proc. ICISC 2013, LNCS 8565, 435-451, 2013
  48. An Anonymous Reputation System with Reputation Secrecy for Manager, Proc. ICISC 2013, LNCS 8565(363), 363-378, 2013
  49. Efficient Proofs for CNF Formulas on Attributes in Pairing-Based Anonymous Credential System, ICISC2012, 495-509, 2012
  50. A Pairing-Based Anonymous Credential System with Efficient Attribute Proofs, Journal of Information Processing, 20(3), 774-784, 2012
  51. Efficient Proofs of Attributes in Pairing-Based Anonymous Credential System, PETS2011, 246-263, 2011
  52. Revocable Group Signature Schemes with Constant Costs for Signing and Verifying, IEICE Trans. Fundamentals, E93-A(1), 50-62, 2010
  53. Anonymous IEEE802.1X Authentication System Using Group Signatures, IPSJ Journal, 51(3), 691-704, 2010
  54. Forward-Secure Group Signatures From Pairings, IEICE Trans. Fundamentals, E93-A(11), 2007-2016, 2010
  55. ★, Revocable Group Signature Schemes with Constant Costs for Signing and Verifying, PKC2009, 463-480, 2009
  56. Forward-Secure Group Signatures From Pairings, Pairing2009, 171-186, 2009
  57. A Short Anonymously Revocable Group Signature Scheme from Decision Linear Assumption, ASIACCS2008, 337-340, 2008
  58. An Implementation of Anonymous IEEE802.1X Authentication with User Revocation, JWIS2008, 112-125, 2008
  59. Efficient Revocable Group Signature Schemes Using Primes, IPSJ Journal, 49(9), 110-121, 2008
  60. Verifier-Local Revocation Group Signature Schemes with Backward Unlinkability from Bilinear Maps, IEICE Trans. Fundamentals, E90-A(1), 65-74, 2007
  61. A Short Verifier-Local Revocation Group Signature Scheme with Backward Unlinkability, IEICE Trans. Fundamentals, E90-A(9), 1793-1802, 2007
  62. A Short Verifier-Local Revocation Group Signature Scheme with Backward Unlinkability, IWSEC2006, 17-32, 2006
  63. A Proposal of Anonymous IEEE802.1X Authentication Protocol for Wireless Networks, NPSec2006, 26-31, 2006
  64. Group Signature Schemes with Membership Revocation for Large Groups, IEICE Trans. Fundamentals, E89-A(5), 1275-1283, 2006
  65. Group Signature Schemes with Membership Revocation for Large Groups, ACISP2005, 443-454, 2005
  66. ★, Verifier-Local Revocation Group Signature Schemes with Backward Unlinkability from Bilinear Maps, ASIACRYPT2005, 533-548, 2005
  67. A Group Signature Scheme with Efficient Membership Revocation for Middle-Scale Groups, IEICE Trans. Fundamentals, Vol.E88-A, E88-A(5), 1224-1233, 2005
  68. An Efficient On-line Electronic Cash with Unlinkable Exact Payments, IEICE Trans. Fundamentals, E88-A(10), 2769-2777, 2005
  69. A Group Signature Scheme with Efficient Membership Revocation for Reasonable Groups, ACISP2004, 336-347, 2004
  70. An Efficient On-line Electronic Cash with Unlinkable Exact Payments, ISC2004, 367-378, 2004
  71. An Efficient Weighted Voting Protocol with Secret Weights, ISITA2004, 498-502, 2004
  72. Sealed-bid Auctions with Efficient Bids Using Secure Bit-slicing Conversion, IEICE Trans. Fundamentals, E87-A(10), 2533-2542, 2004
  73. Sealed-bid Auctions with Efficient Bids, ICISC2003, 230-244, 2003
  74. An Unlinkable Divisible Electronic Cash Using Secure Proxy Computation for DL One-way Function, Trans. IPS. Japan, 44(8), 2126-2136, 2003
  75. An Efficient Anonymous Survey for Attribute Statistics Using a Group Signature Scheme with Attribute Tracing, IEICE Trans. Fundamentals, E86-A(10), 2560-2568, 2003
  76. An Unlinkable Divisible Electronic Cash with User's Less Computations Using Active Trustees, ISITA2002, 547-550, 2002
  77. A Group Signature Scheme Committing the Group, ICICS2002, 73-84, 2002
  78. Anonymous Statistical Survey of Attributes Using Distributed Plaintext Membership Test, Trans. IPS. Japan, 43(8), 2414-2424, 2002
  79. An Efficiency Improvement on an Unlinkable Divisible Electronic Cash System, IEICE Trans. Fundamentals, E85-A(10), 2326-2335, 2002
  80. Anonymous Statistical Survey of Attributes, ACISP2001, 460-473, 2001
  81. Group Signature Scheme with Signature Tracing and Its Application to Electronic Coupon System, Trans. IPS. Japan, 42(8), 2030-2039, 2001
  82. Unlinkable Divisible Electronic Cash, ISW2000, 121-134, 2000
  83. An Anonymous Bidding Protocol without Any Reliable Center, Trans. IPS. Japan, 41(8), 2161-2169, 2000
  84. Unlinkable Electronic Coupon Protocol with Anonymity Control, ISW99, 37-46, 1999
  85. A Linkable Group Signature and Its Application to Secret Voting, Trans. IPS. Japan, 40(7), 3085-3096, 1999

External Funds

Acceptance Results of Competitive Funds

  1. KAKENHI(Grant-in-Aid for Scientific Research (C)), 2022, 2024
  2. KAKENHI, 2013, 2015
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  3. KAKENHI, Proposal and Implementation of Revocable Group Signature Scheme with Scalability, 2010, 2012
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  4. KAKENHI, 2016, 2018
  5. KAKENHI(Grant-in-Aid for Scientific Research (C)), 2019, 2021