A secure code for recipient watermarking against conspiracy attacks by all users. - Hajime Watanabe; Tadao Kasami (ICICS, 1997)

An ID Coding Scheme for Fingerprinting, Randomized c-Secure CRT Code. - Hajime Watanabe; Takashi Kitagawa (ICICS, 2002)

Watermarking method for extracting embedded data without original image. - Madoka Hasegawa; Hajime Watanabe; Takashi Yamada; Shigeo Kato (VCIP, 2002)

A Random-Error-Resilient Collusion-Secure Fingerprinting Code, Randomized c-Secure CRT Code. - Hajime Watanabe; Takashi Kitagawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

Unconditionally Secure Chaffing-and-Winnowing: A Relationship Between Encryption and Authentication. - Goichiro Hanaoka; Yumiko Hanaoka; Manabu Hagiwara; Hajime Watanabe; Hideki Imai (AAECC, 2006)

Generic Transforms to Acquire CCA-Security for Identity Based Encryption: The Cases of FOpkc and REACT. - Takashi Kitagawa; Peng Yang 002; Goichiro Hanaoka; Rui Zhang 002; Hajime Watanabe; Kanta Matsuura; Hideki Imai (ACISP, 2006)

Optimal probabilistic fingerprinting codes using optimal finite random variables related to numerical quadrature - Koji Nuida; Manabu Hagiwara; Hajime Watanabe; Hideki Imai (CoRR, 2006)

An Improvement of Tardos's Collusion-Secure Fingerprinting Codes with Very Short Lengths. - Koji Nuida; Satoshi Fujitsu; Manabu Hagiwara; Takashi Kitagawa; Hajime Watanabe; Kazuto Ogawa; Hideki Imai (AAECC, 2007)

A Tracing Algorithm for Short 2-Secure Probabilistic Fingerprinting Codes Strongly Protecting Innocent Users. - Satoshi Fujitsu; Koji Nuida; Manabu Hagiwara; Takashi Kitagawa; Hajime Watanabe; Kazuto Ogawa; Hideki Imai (CCNC, 2007)

A New Variant for an Attack Against RSA Signature Verification Using Parameter Field. - Yutaka Oiwa; Kazukuni Kobara; Hajime Watanabe (EuroPKI, 2007)

Optimization of Tardos's Fingerprinting Codes in a Viewpoint of Memory Amount. - Koji Nuida; Manabu Hagiwara; Hajime Watanabe; Hideki Imai (Information Hiding, 2007)

Chosen Ciphertext Secure Public Key Encryption with a Simple Structure. - Goichiro Hanaoka; Hideki Imai; Kazuto Ogawa; Hajime Watanabe (IWSEC, 2008)

PAKE-based mutual HTTP authentication for preventing phishing attacks. - Yutaka Oiwa; Hiromitsu Takagi; Hajime Watanabe; Hirofumi Suzuki (WWW, 2009)

PAKE-based mutual HTTP authentication for preventing phishing attacks - Yutaka Oiwa; Hajime Watanabe; Hiromitsu Takagi (CoRR, 2009)

An improvement of discrete Tardos fingerprinting codes. - Koji Nuida; Satoshi Fujitsu; Manabu Hagiwara; Takashi Kitagawa; Hajime Watanabe; Kazuto Ogawa; Hideki Imai (Des. Codes Cryptogr., 2009)

An Efficient 2-Secure and Short Random Fingerprint Code and Its Security Evaluation. - Koji Nuida; Satoshi Fujitsu; Manabu Hagiwara; Hideki Imai; Takashi Kitagawa; Kazuto Ogawa; Hajime Watanabe (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

A low complexity authentication protocol based on pseudorandomness, randomness and homophonic coding. - Miodrag J. Mihaljevic; Hajime Watanabe; Hideki Imai (ISITA, 2010)

On advanced cryptographic techniques for information security of smart grid AMI. - Miodrag J. Mihaljevic; Hideki Imai; Michael W. David; Kazukuni Kobara; Hajime Watanabe (CSIIRW, 2011)

Secure Broadcast System with Simultaneous Individual Messaging. - Arisa Fujii; Go Ohtake; Goichiro Hanaoka; Nuttapong Attrapadung; Hajime Watanabe; Kazuto Ogawa; Hideki Imai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

Partially Wildcarded Attribute-based Encryption and Its Efficient Construction. - Go Ohtake; Yuki Hironaka; Kenjiro Kai; Yosuke Endo; Goichiro Hanaoka; Hajime Watanabe; Shota Yamada 001; Kohei Kasamatsu; Takashi Yamakawa; Hideki Imai (SECRYPT, 2013)

Location prediction attacks using tensor factorization and optimal defenses. - Takao Murakami; Hajime Watanabe (IEEE BigData, 2014)

Vulnerability of the conventional accessible CAPTCHA used by the White House and an alternative approach for visually impaired people. - Michitomo Yamaguchi; Toru Nakata; Hajime Watanabe; Takeshi Okamoto; Hiroaki Kikuchi (SMC, 2014)

Localization Attacks Using Matrix and Tensor Factorization. - Takao Murakami; Hajime Watanabe (IEEE Trans. Inf. Forensics Secur., 2016)

HTTP Authentication Extensions for Interactive Clients. - Yutaka Oiwa; Hajime Watanabe; Hiromitsu Takagi; Kaoru Maeda; Tatsuya Hayashi; Yuichi Ioku (RFC, 2017)

Mutual Authentication Protocol for HTTP. - Yutaka Oiwa; Hajime Watanabe; Hiromitsu Takagi; Kaoru Maeda; Tatsuya Hayashi; Yuichi Ioku (RFC, 2017)

Mutual Authentication Protocol for HTTP: Cryptographic Algorithms Based on the Key Agreement Mechanism 3 (KAM3). - Yutaka Oiwa; Hajime Watanabe; Hiromitsu Takagi; Kaoru Maeda; Tatsuya Hayashi; Yuichi Ioku (RFC, 2017)

Hate Speech on Twitter: A Pragmatic Approach to Collect Hateful and Offensive Expressions and Perform Hate Speech Detection. - Hajime Watanabe; Mondher Bouazizi; Tomoaki Ohtsuki (IEEE Access, 2018)

Attribute-Based Encryption for Range Attributes. - Nuttapong Attrapadung; Goichiro Hanaoka; Kazuto Ogawa; Go Ohtake; Hajime Watanabe; Shota Yamada 001 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)