| 2016 | SCN | Attribute-Based Encryption for Range Attributes. | Nuttapong Attrapadung, Goichiro Hanaoka, Kazuto Ogawa, Go Ohtake, Hajime Watanabe, Shota Yamada |
| 2014 | SMC | 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 |
| 2013 | SECRYPT | Partially Wildcarded Attribute-based Encryption and Its Efficient Construction. | Go Ohtake, Yuki Hironaka, Kenjiro Kai, Yosuke Endo, Goichiro Hanaoka, Hajime Watanabe, Shota Yamada, Kohei Kasamatsu, Takashi Yamakawa, Hideki Imai |
| 2010 | ISITA | A low complexity authentication protocol based on pseudorandomness, randomness and homophonic coding. | Miodrag J. Mihaljevic, Hajime Watanabe, Hideki Imai |
| 2009 | WWW | PAKE-based mutual HTTP authentication for preventing phishing attacks. | Yutaka Oiwa, Hiromitsu Takagi, Hajime Watanabe, Hirofumi Suzuki |
| 2008 | IWSEC | Chosen Ciphertext Secure Public Key Encryption with a Simple Structure. | Goichiro Hanaoka, Hideki Imai, Kazuto Ogawa, Hajime Watanabe |
| 2006 | ACISP | Generic Transforms to Acquire CCA-Security for Identity Based Encryption: The Cases of FOpkc and REACT. | Takashi Kitagawa, Peng Yang, Goichiro Hanaoka, Rui Zhang, Hajime Watanabe, Kanta Matsuura, Hideki Imai |
| 2002 | ICICS | An ID Coding Scheme for Fingerprinting, Randomized c-Secure CRT Code. | Hajime Watanabe, Takashi Kitagawa |
| 2002 | VCIP | Watermarking method for extracting embedded data without original image. | Madoka Hasegawa, Hajime Watanabe, Takashi Yamada, Shigeo Kato |
| 1997 | ICICS | A secure code for recipient watermarking against conspiracy attacks by all users. | Hajime Watanabe, Tadao Kasami |