Eiji Okamoto

Xun Yi, Eiji Okamoto: Practical Internet voting system. J. Network and Computer Applications 36(1): 378-387 (2013)

Nuray At, Jean-Luc Beuchat, Eiji Okamoto, Ismail San, Teppei Yamazaki: Compact Hardware Implementations of ChaCha, BLAKE, Threefish, and Skein on FPGA. IACR Cryptology ePrint Archive 2013: 113 (2013)

Lihua Wang, Licheng Wang, Masahiro Mambo, Eiji Okamoto: Identity-Based Proxy Cryptosystems with Revocability and Hierarchical Confidentialities. IEICE Transactions 95-A(1): 70-88 (2012)

Naoki Ogura, Shigenori Uchiyama, Naoki Kanayama, Eiji Okamoto: A Note on the Pairing Computation Using Normalized Miller Functions. IEICE Transactions 95-A(1): 196-203 (2012)

Yoshitoshi Yamashita, Eiji Okamoto, Yasunori Iwanami, Yozo Shoji, Morio Toyoshima, Yoshihisa Takayama: A Markov-Based Satellite-to-Ground Optical Channel Model and Its Effective Coding Scheme. IEICE Transactions 95-B(1): 254-262 (2012)

Eiji Okamoto: A Chaos MIMO Transmission Scheme for Channel Coding and Physical-Layer Security. IEICE Transactions 95-B(4): 1384-1392 (2012)

Kazutaka Fukuda, Eiji Okamoto: Performance Improvement of IMR-Based NLOS Detection in Indoor Ultra Wide-Band TOA Localization. IEICE Transactions 95-A(10): 1658-1666 (2012)

Sk. Md. Mizanur Rahman, M. Anwar Hossain, Hussein Mouftah, Abdulmotaleb El-Saddik, Eiji Okamoto: Chaos-cryptography based privacy preservation technique for video surveillance. Multimedia Syst. 18(2): 145-155 (2012)

Naoki Kanayama, Eiji Okamoto: Approach to Pairing Inversions Without Solving Miller Inversion. IEEE Transactions on Information Theory 58(2): 1248-1253 (2012)

Kazutaka Fukuda, Eiji Okamoto: Performance improvement of TOA localization using IMR-based NLOS detection in sensor networks. ICOIN 2012: 13-18

Xun Yi, Raylin Tso, Eiji Okamoto: Identity-based Password-Authenticated Key Exchange for Client/Server Model. SECRYPT 2012: 45-54

Yuta Koshimizu, Eiji Okamoto: An Effective Channel Estimation Scheme for Bi-Directional Two-Timeslot OFDM Relay Transmission Using Analog Network Coding. VTC Spring 2012: 1-5

Nuray At, Jean-Luc Beuchat, Eiji Okamoto, Ismail San, Teppei Yamazaki: A Low-Area Unified Hardware Architecture for the AES and the Cryptographic Hash Function Gr{\o}stl. IACR Cryptology ePrint Archive 2012: 535 (2012)

Naoki Kanayama, Tadanori Teruya, Eiji Okamoto: Scalar Multiplication on Pairing Friendly Elliptic Curves. IEICE Transactions 94-A(6): 1285-1292 (2011)

Yasuhiro Fuwa, Eiji Okamoto, Yasunori Iwanami: An Effective Downlink Resource Allocation Scheme Based on MIMO-OFDMA-CDM in Cellular System. IEICE Transactions 94-B(12): 3550-3558 (2011)

Jean-Luc Beuchat, Eiji Okamoto, Teppei Yamazaki: A low-area unified hardware architecture for the AES and the cryptographic hash function ECHO. J. Cryptographic Engineering 1(2): 101-121 (2011)

Jean-Luc Beuchat, Jérémie Detrey, Nicolas Estibals, Eiji Okamoto, Francisco Rodríguez-Henríquez: Fast Architectures for the \eta_T Pairing over Small-Characteristic Supersingular Elliptic Curves. IEEE Trans. Computers 60(2): 266-281 (2011)

Xun Yi, Eiji Okamoto: Practical Remote End-to-End Voting Scheme. EGOVIS 2011: 386-400

Masayuki Okada, Yasuharu Katsuno, Akira Kanaoka, Eiji Okamoto: 32-bit as Number Based IP Traceback. IMIS 2011: 628-633

Naoto Yanai, Raylin Tso, Masahiro Mambo, Eiji Okamoto: Certificateless Ordered Sequential Aggregate Signature Scheme. INCoS 2011: 662-667

Naoki Ogura, Naoki Kanayama, Shigenori Uchiyama, Eiji Okamoto: Cryptographic Pairings Based on Elliptic Nets. IWSEC 2011: 65-78

Alberto Moreno, Eiji Okamoto: BlueSnarf Revisited: OBEX FTP Service Directory Traversal. Networking Workshops 2011: 155-166

Sk. Md. Mizanur Rahman, Md. Mehedi Masud, Carlisle Adams, Khalil El-Khatib, Hussein T. Mouftah, Eiji Okamoto: Cryptographic security models for eHealth P2P database management systems network. PST 2011: 164-173

Xun Yi, Raylin Tso, Eiji Okamoto: Three-party Password-authenticated Key Exchange without Random Oracles. SECRYPT 2011: 15-24

Eiji Okamoto: A Chaos MIMO Transmission Scheme for Secure Communications on Physical Layer. VTC Spring 2011: 1-5

Eiji Okamoto, Hiroyuki Tsuji, Yoshiyuki Fujino: Performance improvement of OFDMA cellular system using code division multiplexing in satellite/terrestrial integrated mobile communication system. WPMC 2011: 1-5

Yuya Takahashi, Yasunori Iwanami, Eiji Okamoto: A comparative study on MIMO MLSE turbo equalizer on frequency selective channels. WPMC 2011: 1-5

Jean-Luc Beuchat, Eiji Okamoto, Teppei Yamazaki: A Low-Area Unified Hardware Architecture for the AES and the Cryptographic Hash Function ECHO. IACR Cryptology ePrint Archive 2011: 78 (2011)

Simon Kramer, Rajeev Goré, Eiji Okamoto: Computer-Aided Decision-Making for Formal Relations and Domains of Trust, Distrust, and Mistrust with Cryptographic Applications. IACR Cryptology ePrint Archive 2011: 235 (2011)

Jean-Luc Beuchat, Hiroshi Doi, Kaoru Fujita, Atsuo Inomata, Piseth Ith, Akira Kanaoka, Masayoshi Katouno, Masahiro Mambo, Eiji Okamoto, Takeshi Okamoto, Takaaki Shiga, Masaaki Shirase, Ryuji Soga, Tsuyoshi Takagi, Ananda Vithanage, Hiroyasu Yamamoto: FPGA and ASIC implementations of the eta_T pairing in characteristic three. Computers & Electrical Engineering 36(1): 73-87 (2010)

Anton Romanov, Eiji Okamoto: Forecasting of Information Security Related Incidents: Amount of Spam Messages as a Case Study. IEICE Transactions 93-B(6): 1411-1421 (2010)

Takashi Kozawa, Yasunori Iwanami, Eiji Okamoto, Ryota Yamada, Naoki Okamoto: An Evaluation on Throughput Performance for Type II Hybrid-ARQ Using Non-binary Rate-Compatible-Punctured LDPC Codes. IEICE Transactions 93-A(11): 2089-2091 (2010)

Satoshi Nakanobu, Yasunori Iwanami, Eiji Okamoto: A Comparative Study on Time Domain Sequential Equalizer with MLD and MLSE Equalizer on MIMO Frequency Selective Channels. IEICE Transactions 93-B(11): 3197-3202 (2010)

Chifumi Sato, Takeshi Okamoto, Eiji Okamoto: Strongly unforgeable ID-based signatures without random oracles. IJACT 2(1): 35-45 (2010)

Anton Romanov, Hiroe Tsubaki, Eiji Okamoto: An Approach to Perform Quantitative Information Security Risk Assessment in IT Landscapes. JIP 18: 213-226 (2010)

Simon Kramer, Rajeev Goré, Eiji Okamoto: Formal definitions and complexity results for trust relations and trust domains fit for TTPs, the web of trust, PKIs, and ID-based cryptography. SIGACT News 41(1): 75-98 (2010)

Raylin Tso, Xun Yi, Tadahiko Ito, Takeshi Okamoto, Eiji Okamoto: Design and Analysis of "Flexible" k-out-of-n Signatures. ATC 2010: 255-267

Lihua Wang, Licheng Wang, Zhenfu Cao, Eiji Okamoto, Jun Shao: New Constructions of Public-Key Encryption Schemes from Conjugacy Search Problems. Inscrypt 2010: 1-17

Jean-Luc Beuchat, Eiji Okamoto, Teppei Yamazaki: Compact implementations of BLAKE-32 and BLAKE-64 on FPGA. FPT 2010: 170-177

Yoshitoshi Yamashita, Eiji Okamoto, Yasunori Iwanami, Yozo Shoji, Morio Toyoshima, Yoshihisa Takayama: An Efficient LDGM Coding Scheme for Optical Satellite-to-Ground Link Based on a New Channel Model. GLOBECOM 2010: 1-6

Lihua Wang, Licheng Wang, Masahiro Mambo, Eiji Okamoto: Identity-Based Proxy Cryptosystems with Revocability and Hierarchical Confidentialities. ICICS 2010: 383-400

Sk. Md. Mizanur Rahman, M. Anwar Hossain, Hussein T. Mouftah, Abdulmotaleb El-Saddik, Eiji Okamoto: A real-time privacy-sensitive data hiding approach based on chaos cryptography. ICME 2010: 72-77

Kenji Nakayama, Yasunori Iwanami, Eiji Okamoto: MIMO MFSK receivers using FDE and MLD on quasi-static frequency selective fading channels. ISITA 2010: 31-36

Jean-Luc Beuchat, Jorge Enrique González-Díaz, Shigeo Mitsunari, Eiji Okamoto, Francisco Rodríguez-Henríquez, Tadanori Teruya: High-Speed Software Implementation of the Optimal Ate Pairing over Barreto-Naehrig Curves. Pairing 2010: 21-39

Lihua Wang, Licheng Wang, Masahiro Mambo, Eiji Okamoto: New Identity-Based Proxy Re-encryption Schemes to Prevent Collusion Attacks. Pairing 2010: 327-346

Toshiki Harada, Akira Kanaoka, Eiji Okamoto, Masahiko Kato: Identifying Potentially-Impacted Area by Vulnerabilities in Networked Systems Using CVSS. SAINT 2010: 367-370

Azlan Abd Aziz, Yasunori Iwanami, Eiji Okamoto: On the Improvement of Maximum Likelihood Detection in Multiple Relay Systems. WCNC 2010: 1-6

Sk. Md. Mizanur Rahman, Mehedi Masud, Carlisle Adams, Khalil El-Khatib, Hussein T. Mouftah, Eiji Okamoto: Pair-wise Cryptographic Models for Secure Data Exchange in P2P Database Management Systems. IACR Cryptology ePrint Archive 2010: 85 (2010)

Jean-Luc Beuchat, Eiji Okamoto, Teppei Yamazaki: Compact Implementations of BLAKE-32 and BLAKE-64 on FPGA. IACR Cryptology ePrint Archive 2010: 173 (2010)

Naoki Ogura, Naoki Kanayama, Shigenori Uchiyama, Eiji Okamoto: Cryptographic Pairings Based on Elliptic Nets. IACR Cryptology ePrint Archive 2010: 353 (2010)

Jean-Luc Beuchat, Jorge Enrique González-Díaz, Shigeo Mitsunari, Eiji Okamoto, Francisco Rodríguez-Henríquez, Tadanori Teruya: High-Speed Software Implementation of the Optimal Ate Pairing over Barreto-Naehrig Curves. IACR Cryptology ePrint Archive 2010: 354 (2010)

Jean-Luc Beuchat, Eiji Okamoto, Teppei Yamazaki: A Compact FPGA Implementation of the SHA-3 Candidate ECHO. IACR Cryptology ePrint Archive 2010: 364 (2010)

Seiichi Matsuda, Naoki Kanayama, Florian Hess, Eiji Okamoto: Optimised Versions of the Ate and Twisted Ate Pairings. IEICE Transactions 92-A(7): 1660-1667 (2009)

Chifumi Sato, Takeshi Okamoto, Eiji Okamoto: Sender Authenticated Key Agreements without Random Oracles. IEICE Transactions 92-A(8): 1787-1794 (2009)

Yasuharu Katsuno, Yuji Watanabe, Michiharu Kudo, Eiji Okamoto: A Pluggable Domain Management Approach for Building Practical Distributed Coalitions. ARES 2009: 1-8

Jean-Luc Beuchat, Jérémie Detrey, Nicolas Estibals, Eiji Okamoto, Francisco Rodríguez-Henríquez: Hardware Accelerator for the Tate Pairing in Characteristic Three Based on Karatsuba-Ofman Multipliers. CHES 2009: 225-239

Anton Romanov, Eiji Okamoto: A quantitative approach to assess information security related risks. CRiSIS 2009: 117-122

Anton Romanov, Eiji Okamoto: A Framework for Building and Managing Secured ERP Landscape. Security and Management 2009: 490-495

Chifumi Sato, Takeshi Okamoto, Eiji Okamoto: Strongly Unforgeable ID-Based Signatures without Random Oracles. ISPEC 2009: 35-46

Raylin Tso, Takeshi Okamoto, Eiji Okamoto: Efficient Short Signatures from Pairing. ITNG 2009: 417-422

Xun Yi, Raylin Tso, Eiji Okamoto: ID-Based Group Password-Authenticated Key Exchange. IWSEC 2009: 192-211

Anton Romanov, Eiji Okamoto: An Approach for Designing of Enterprise IT Landscapes to Perform Quantitave Information Security Risk Assessment. SECRYPT 2009: 313-318

Jean-Luc Beuchat, Jérémie Detrey, Nicolas Estibals, Eiji Okamoto, Francisco Rodríguez-Henríquez: Hardware Accelerator for the Tate Pairing in Characteristic Three Based on Karatsuba-Ofman Multipliers. IACR Cryptology ePrint Archive 2009: 122 (2009)

Jean-Luc Beuchat, Jérémie Detrey, Nicolas Estibals, Eiji Okamoto, Francisco Rodríguez-Henríquez: Fast Architectures for the eta_T Pairing over Small-Characteristic Supersingular Elliptic Curves. IACR Cryptology ePrint Archive 2009: 398 (2009)

Chifumi Sato, Takeshi Okamoto, Eiji Okamoto: Underlying Assumptions and Designated Verifier Signatures. IACR Cryptology ePrint Archive 2009: 499 (2009)

Licheng Wang, Lihua Wang, Zhenfu Cao, Eiji Okamoto, Jun Shao: New Cryptosystems From CSP-Based Self-Distributive Systems. IACR Cryptology ePrint Archive 2009: 566 (2009)

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: Some Efficient Algorithms for the Final Exponentiation of eta^T Pairing. IEICE Transactions 91-A(1): 221-228 (2008)

Sk. Md. Mizanur Rahman, Nidal Nasser, Atsuo Inomata, Takeshi Okamoto, Masahiro Mambo, Eiji Okamoto: Anonymous authentication and secure communication protocol for wireless mobile ad hoc networks. Security and Communication Networks 1(2): 179-189 (2008)

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto, Masaaki Shirase, Tsuyoshi Takagi: Algorithms and Arithmetic Operators for Computing the etaT Pairing in Characteristic Three. IEEE Trans. Computers 57(11): 1454-1468 (2008)

Xun Yi, Mike Faulkner, Eiji Okamoto: Secure Wireless Sensor Networks. ARES 2008: 497-502

Atsushi Koide, Raylin Tso, Takeshi Okamoto, Eiji Okamoto: A Restricted Undeniable Designated Verifier Signature. APSCC 2008: 1375-1380

Atsushi Koide, Raylin Tso, Eiji Okamoto: A Sanitizing Signature Scheme with Indexing. EUC (2) 2008: 16-21

Atsushi Koide, Raylin Tso, Eiji Okamoto: Convertible Undeniable Partially Blind Signature from Bilinear Pairings. EUC (2) 2008: 77-82

Raylin Tso, Xun Yi, Takeshi Okamoto, Eiji Okamoto: Efficient convertible Limited Verifier Signatures. ISIT 2008: 230-234

Raylin Tso, Takeshi Okamoto, Eiji Okamoto: 1-out-of-. ISPEC 2008: 45-55

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: An Efficient Countermeasure against Side Channel Attacks for Pairing Computation. ISPEC 2008: 290-303

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto, Francisco Rodríguez-Henríquez: A Comparison between Hardware Accelerators for the Modified Tate Pairing over F_2^m and F_3^m. Pairing 2008: 297-315

Chifumi Sato, Takeshi Okamoto, Eiji Okamoto: Strongly Unforgeable ID-based Signatures Without Random Oracles. IACR Cryptology ePrint Archive 2008: 95 (2008)

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto, Francisco Rodríguez-Henríquez: A Comparison Between Hardware Accelerators for the Modified Tate Pairing over F_2^m and F_3^m. IACR Cryptology ePrint Archive 2008: 115 (2008)

Nidia Cortez-Duarte, Francisco Rodríguez-Henríquez, Jean-Luc Beuchat, Eiji Okamoto: A Pipelined Karatsuba-Ofman Multiplier over GF($3^{97}$) Amenable for Pairing Computation. IACR Cryptology ePrint Archive 2008: 127 (2008)

Jean-Luc Beuchat, Hiroshi Doi, Kaoru Fujita, Atsuo Inomata, Piseth Ith, Akira Kanaoka, Masayoshi Katouno, Masahiro Mambo, Eiji Okamoto, Takeshi Okamoto, Takaaki Shiga, Masaaki Shirase, Ryuji Soga, Tsuyoshi Takagi, Ananda Vithanage, Hiroyasu Yamamoto: FPGA and ASIC Implementations of the eta_T Pairing in Characteristic Three. IACR Cryptology ePrint Archive 2008: 280 (2008)

Lihua Wang, Eiji Okamoto, Ying Miao, Takeshi Okamoto, Hiroshi Doi: An ID-SP-M4M Scheme and Its Security Analysis. IEICE Transactions 90-A(1): 91-100 (2007)

Raylin Tso, Xun Yi, Eiji Okamoto: ID-Based Key Agreement for Dynamic Peer Groups in Mobile Computing Environments. APSCC 2007: 103-110

Jean-Luc Beuchat, Takanori Miyoshi, Yoshihito Oyama, Eiji Okamoto: Multiplication over F_p^m on FPGA: A Survey. ARC 2007: 214-225

Jean-Luc Beuchat, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: An Algorithm for the nt Pairing Calculation in Characteristic Three and its Hardware Implementation. IEEE Symposium on Computer Arithmetic 2007: 97-104

Raylin Tso, Chunxiang Gu, Takeshi Okamoto, Eiji Okamoto: Efficient ID-Based Digital Signatures with Message Recovery. CANS 2007: 47-59

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto: Arithmetic Operators for Pairing-Based Cryptography. CHES 2007: 239-255

Raylin Tso, Takeshi Okamoto, Eiji Okamoto: ECDSA-Verifiable Signcryption Scheme with Signature Verification on the Signcrypted Message. Inscrypt 2007: 11-24

Seiichi Matsuda, Naoki Kanayama, Florian Hess, Eiji Okamoto: Optimised Versions of the Ate and Twisted Ate Pairings. IMA Int. Conf. 2007: 302-312

Raylin Tso, Juan Manuel González Nieto, Takeshi Okamoto, Colin Boyd, Eiji Okamoto: Verifier-Key-Flexible Universal Designated-Verifier Signatures. IMA Int. Conf. 2007: 403-421

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: Some Efficient Algorithms for the Final Exponentiation of eta _T Pairing. ISPEC 2007: 254-268

Raylin Tso, Takeshi Okamoto, Eiji Okamoto: An Improved Signcryption Scheme and Its Variation. ITNG 2007: 772-778

Jean-Luc Beuchat, Nicolas Brisebarre, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: A Coprocessor for the Final Exponentiation of the eta _T Pairing in Characteristic Three. WAIFI 2007: 25-39

Masaaki Shirase, Yuto Kawahara, Tsuyoshi Takagi, Eiji Okamoto: Universal eta_T Pairing Algorithm over Arbitrary Extension Degree. WISA 2007: 1-15

Tsuyoshi Takagi, Tatsuaki Okamoto, Eiji Okamoto, Takeshi Okamoto (Eds.): Pairing-Based Cryptography - Pairing 2007, First International Conference, Tokyo, Japan, July 2-4, 2007, Proceedings. Lecture Notes in Computer Science 4575, Springer 2007, isbn 978-3-540-73488-8

Seiichi Matsuda, Naoki Kanayama, Florian Hess, Eiji Okamoto: Optimised versions of the Ate and Twisted Ate Pairings. IACR Cryptology ePrint Archive 2007: 13 (2007)

Jean-Luc Beuchat, Nicolas Brisebarre, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: A Coprocessor for the Final Exponentiation of the eta_T Pairing in Characteristic Three. IACR Cryptology ePrint Archive 2007: 45 (2007)

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto: Arithmetic Operators for Pairing-Based Cryptography. IACR Cryptology ePrint Archive 2007: 91 (2007)

Jean-Luc Beuchat, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: A Refined Algorithm for the eta_T Pairing Calculation in Characteristic Three. IACR Cryptology ePrint Archive 2007: 311 (2007)

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto, Masaaki Shirase, Tsuyoshi Takagi: Algorithms and Arithmetic Operators for Computing the eta_T Pairing in Characteristic Three. IACR Cryptology ePrint Archive 2007: 417 (2007)

Xun Yi, Raylin Tso, Eiji Okamoto: ID-Based Group Password-Authenticated Key Exchange. IACR Cryptology ePrint Archive 2007: 469 (2007)

Lihua Wang, Zhenfu Cao, Takeshi Okamoto, Ying Miao, Eiji Okamoto: Authorization-Limited Transformation-Free Proxy Cryptosystems and Their Security Analyses. IEICE Transactions 89-A(1): 106-114 (2006)

Kun Peng, Colin Boyd, Ed Dawson, Eiji Okamoto: A Novel Range Test. ACISP 2006: 247-258

Yuto Kawahara, Tsuyoshi Takagi, Eiji Okamoto: Efficient Implementation of Tate Pairing on a Mobile Phone Using Java. CIS 2006: 396-405

Eiji Okamoto, Yasunori Iwanami: A trellis-coded chaotic modulation scheme. ICC 2006: 5010-5015

Sk. Md. Mizanur Rahman, Atsuo Inomata, Takeshi Okamoto, Masahiro Mambo, Eiji Okamoto: Anonymous Secure Communication in Wireless Mobile Ad-Hoc Networks. ICUCT 2006: 140-149

Sk. Md. Mizanur Rahman, Masahiro Mambo, Atsuo Inomata, Eiji Okamoto: An Anonymous On-Demand Position-Based Routing in Mobile Ad Hoc Networks. SAINT 2006: 300-306

Raylin Tso, Chunxiang Gu, Takeshi Okamoto, Eiji Okamoto: An Efficient ID-based Digital Signature with Message Recovery Based on Pairing. IACR Cryptology ePrint Archive 2006: 195 (2006)

Yuto Kawahara, Tsuyoshi Takagi, Eiji Okamoto: Efficient Implementation of Tate Pairing on a Mobile Phone using Java. IACR Cryptology ePrint Archive 2006: 299 (2006)

Jean-Luc Beuchat, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: An Algorithm for the η_T Pairing Calculation in Characteristic Three and its Hardware Implementation. IACR Cryptology ePrint Archive 2006: 327 (2006)

Sk. Md. Mizanur Rahman, Atsuo Inomata, Takeshi Okamoto, Masahiro Mambo, Eiji Okamoto: Anonymous Secure Communication in Wireless Mobile Ad-hoc Networks. IACR Cryptology ePrint Archive 2006: 328 (2006)

Lihua Wang, Takeshi Okamoto, Masahiro Mambo, Eiji Okamoto: A Subject-Delegated Decryption Scheme with "Tightly" Limited Authority. IACR Cryptology ePrint Archive 2006: 344 (2006)

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: Some Efficient Algorithms for the Final Exponentiation of η_T Pairing. IACR Cryptology ePrint Archive 2006: 431 (2006)

Javier Lopez, José A. Montenegro, José Luis Vivas, Eiji Okamoto, Ed Dawson: Specification and design of advanced authentication and authorization services. Computer Standards & Interfaces 27(5): 467-478 (2005)

Kun Peng, Ed Dawson, Juanma González Nieto, Eiji Okamoto, Javier Lopez: A Novel Method to Maintain Privacy in Mobile Agent Applications. CANS 2005: 247-260

Raylin Tso, Takeshi Okamoto, Tsuyoshi Takagi, Eiji Okamoto: An id-based non-interactive tripartite key agreement protocol with K-resilience. Communications and Computer Networks 2005: 38-42

Lihua Wang, Takeshi Okamoto, Tsuyoshi Takagi, Eiji Okamoto: Insider Impersonation-MIM Attack to Tripartite Key Agreement Scheme and an Efficient Protocol for Multiple Keys. CIS (2) 2005: 198-203

Raylin Tso, Takeshi Okamoto, Eiji Okamoto: Practical Strong Designated Verifier Signature Schemes Based on Double Discrete Logarithms. CISC 2005: 113-127

Takeshi Okamoto, Atsuo Inomata, Eiji Okamoto: A Proposal of Short Proxy Signature using Pairing. ITCC (1) 2005: 631-635

Eiji Okamoto, Takeshi Okamoto: Cryptosystems Based on Elliptic Curve Pairing. MDAI 2005: 13-23

Takeshi Okamoto, Raylin Tso, Eiji Okamoto: One-Way and Two-Party Authenticated ID-Based Key Agreement Protocols Using Pairing. MDAI 2005: 122-133

Lihua Wang, Eiji Okamoto, Ying Miao, Takeshi Okamoto, Hiroshi Doi: ID-Based Series-Parallel Multisignature Schemes for Multi-Messages from Bilinear Maps. WCC 2005: 291-303

Ryôichi Sasaki, Sihan Qing, Eiji Okamoto, Hiroshi Yoshiura (Eds.): Security and Privacy in the Age of Ubiquitous Computing, IFIP TC11 20th International Conference on Information Security (SEC 2005), May 30 - June 1, 2005, Chiba, Japan. Springer 2005, isbn 0-387-25658-X

Malapati Raja Sekhar, Takeshi Okamoto, Eiji Okamoto: On Designatedly Verified (Non-interactive) Watermarking Schemes. IACR Cryptology ePrint Archive 2005: 120 (2005)

Raylin Tso, Takeshi Okamoto, Eiji Okamoto: Simple and Provable Secure Strong Designated Verifier Signature Schemes. IACR Cryptology ePrint Archive 2005: 238 (2005)

Raylin Tso, Ying Miao, Takeshi Okamoto, Eiji Okamoto: A Share-Correctable Protocol for the Shamir Threshold Scheme and Its Application to Participant Enrollment. IACR Cryptology ePrint Archive 2005: 239 (2005)

Masakazu Soshi, Mamoru Maekawa, Eiji Okamoto: The Dynamic-Typed Access Matrix Model and Decidability of the Safety Problem. IEICE Transactions 87-A(1): 190-203 (2004)

Javier Lopez, Sihan Qing, Eiji Okamoto (Eds.): Information and Communications Security, 6th International Conference, ICICS 2004, Malaga, Spain, October 27-29, 2004, Proceedings. Lecture Notes in Computer Science 3269, Springer 2004, isbn 3-540-23563-9

Selwyn Russell, Ed Dawson, Eiji Okamoto, Javier Lopez: Virtual certificates and synthetic certificates: new paradigms for improving public key validation. Computer Communications 26(16): 1826-1838 (2003)

Juan Manuel González Nieto, Ed Dawson, Eiji Okamoto: Privacy and Trusted Computing. DEXA Workshops 2003: 383-388

Akira Kanaoka, Eiji Okamoto: Multivariate Statistical Analysis of Network Traffic for Intrusion Detection. DEXA Workshops 2003: 472-476

Raylin Tso, Ying Miao, Eiji Okamoto: A New Algorithm for Searching a Consistent Set of Shares in a Threshold Scheme with Cheaters. ICISC 2003: 377-385

Takeshi Okamoto, Hirofumi Katsuno, Eiji Okamoto: A Fast Signature Scheme Based on New On-line Computation. ISC 2003: 111-121

Eiji Okamoto, Hiroyo Ogawa: A block-coded modulation method for one-way multimode data transmission. IEEE Transactions on Communications 50(12): 2124-2135 (2002)

Marie Henderson, Robert S. Coulter, Ed Dawson, Eiji Okamoto: Modelling Trust Structures for Public Key Infrastructures. ACISP 2002: 56-70

Masahiro Mambo, Eiji Okamoto, Yasushi Sengoku, Takashi Tanaka: Simple and Secure Mobile Access under the Flexible Organization Management. DEXA Workshops 2002: 456-462

Ed Dawson, Javier Lopez, José A. Montenegro, Eiji Okamoto: A New Design of Privilege Management Infrastructure for Organizations Using Outsourced PKI. ISC 2002: 136-149

Xun Yi, Chee Kheong Siew, Xiao Feng Wang, Eiji Okamoto: A Secure Agent-based Framework for Internet Trading in Mobile Computing Environments. Distributed and Parallel Databases 8(1): 85-117 (2000)

Hiroshi Doi, Masahiro Mambo, Eiji Okamoto: On the Security of the RSA-Based Multisignature Scheme for Various Group Structures. ACISP 2000: 352-367

Mike Burmester, Yvo Desmedt, Hiroshi Doi, Masahiro Mambo, Eiji Okamoto, Mitsuru Tada, Yuko Yoshifuji: A Structured ElGamal-Type Multisignature Scheme. Public Key Cryptography 2000: 466-483

Bimal K. Roy, Eiji Okamoto (Eds.): Progress in Cryptology - INDOCRYPT 2000, First International Conference in Cryptology in India, Calcutta, India, December 10-13, 2000, Proceedings. Lecture Notes in Computer Science 1977, Springer 2000, isbn 3-540-41452-5

Josef Pieprzyk, Eiji Okamoto, Jennifer Seberry (Eds.): Information Security, Third International Workshop, ISW 2000, Wollongong, NSW, Australia, December 20-21, 2000, Proceedings. Lecture Notes in Computer Science 1975, Springer 2000, isbn 3-540-41416-9

Xiao Feng Wang, Kwok-Yan Lam, Xun Yi, C. Q. Zhang, Eiji Okamoto: Secure Agent-Mediated Auctionlike Negotiation Protocol for Internet Retail Commerce. CIA 1999: 291-302

Kazumasa Omote, Eiji Okamoto: User Identification System Based on Biometrics for Keystroke. ICICS 1999: 216-229

Josef Pieprzyk, Eiji Okamoto: Verfiable Secret Sharing and Time Capsules. ICISC 1999: 169-183

Shigeki Kitazawa, Xun Yi, Eiji Okamoto, Masahiro Mambo: Improvement of Secure Access Control Agent for Distributed Files. ICPP Workshops 1999: 185-

Takeshi Okamoto, Mitsuru Tada, Eiji Okamoto: Extended Proxy Signatures for Smart Cards. ISW 1999: 247-258

Kwok-Yan Lam, Eiji Okamoto, Chaoping Xing (Eds.): Advances in Cryptology - ASIACRYPT '99, International Conference on the Theory and Applications of Cryptology and Information Security, Singapore, November 14-18, 1999, Proceedings. Lecture Notes in Computer Science 1716, Springer 1999, isbn 3-540-66666-4

Xun Yi, Eiji Okamoto, Kwok-Yan Lam: An optimized protocol for mobile network authentication and security. Mobile Computing and Communications Review 2(3): 37-39 (1998)

Agus Fanar Syukri, Eiji Okamoto, Masahiro Mambo: A User Identification System Using Signature Written with Mouse. ACISP 1998: 403-414

Xiao Feng Wang, Xun Yi, Kwok-Yan Lam, Eiji Okamoto: Secure Information Gathering Agent for Internet Trading. DAI 1998: 183-193

Xun Yi, Xiao Feng Wang, Kwok-Yan Lam, Eiji Okamoto, D. Frank Hsu: A Security Auction-Like Negotiation Protocol for Agent-Based Internet Trading. SRDS 1998: 197-203

Eiji Okamoto, George I. Davida, Masahiro Mambo (Eds.): Information Security, First International Workshop, ISW '97, Tatsunokuchi, Japan, September 17-19, 1997, Proceedings. Lecture Notes in Computer Science 1396, Springer 1998, isbn 3-540-64382-6

Tomohiko Uyematsu, Eiji Okamoto: A construction of codes with exponential error bounds on arbitrary discrete memoryless channels. IEEE Transactions on Information Theory 43(3): 992-996 (1997)

Masahiro Mambo, Eiji Okamoto, Kouichi Sakurai: Protection of Data and Delegated Keys in Digital Distribution. ACISP 1997: 271-282

Kenichi Hayashi, Eiji Okamoto, Masahiro Mambo: Proposal of user identification scheme using mouse. ICICS 1997: 144-148

Hisao Sakazaki, Eiji Okamoto, Masahiro Mambo: The Application of ID-Based Key Distribution Systems to an Elliptic Curve. ISW 1997: 335-344

Masahiro Mambo, Takanori Murayama, Eiji Okamoto: A tentative approach to constructing tamper-resistant software. NSPW 1997: 23-33

Masahiro Mambo, Kouichi Sakurai, Eiji Okamoto: How to Utilize the Transformability of Digital Signatures for Solving the Oracle Problem. ASIACRYPT 1996: 322-333

Masahiro Mambo, Keisuke Usuda, Eiji Okamoto: Proxy Signatures for Delegating Signing Operation. ACM Conference on Computer and Communications Security 1996: 48-57

Eiji Okamoto, Tomohiko Uyematsu, Masahiro Mambo: Permutation Cipher Scheme Using Polynomials over a Field. IEICE Transactions 78-D(2): 138-142 (1995)

Yukiyasu Tsunoo, Eiji Okamoto, Tomohiko Uyematsu: Ciphertext Only Attack for One-way Function of the MAP Using One Ciphertext. CRYPTO 1994: 369-382

Kazue Tanaka, Eiji Okamoto: Key distribution system for mail systems using ID-related information directory. Computers & Security 10(1): 25-33 (1991)

Eiji Okamoto: Substantial Number of Cryptographic Keys and Its Application to Encryption Designs. EUROCRYPT 1988: 361-373

Eiji Okamoto: Key Distribution Systems Based on Identification Information. CRYPTO 1987: 194-202

Eiji Okamoto, K. Nakamura: Lifetimes of Keys in Cryptographic Key Management Systems. CRYPTO 1985: 246-259