Proposal on personal identifiers generated from the STR information of DNA. - Yukio Itakura; Masaki Hashiyada; Toshio Nagashima; Shigeo Tsujii (Int. J. Inf. Sec., 2002)

Proposal on Personal Authentication System in which Biological Information is embedded in Cryptosystem Key. - Yukio Itakura; Shigeo Tsujii (IACR Cryptol. ePrint Arch., 2003)

Proposal on a multifactor biometric authentication method based on cryptosystem keys containing biometric signatures. - Yukio Itakura; Shigeo Tsujii (Int. J. Inf. Sec., 2005)

Proposal of privacy policy matching engine. - Takao Kojima; Yukio Itakura (Digital Identity Management, 2008)