About UMEZAWA KATSUYUKI
About TEZUKA SATORU
About 東京工科大 コンピュータサイエンス
About 電子情報通信学会技術研究報告
About mobile terminal
About document
About proof (evidence)
About digital signature
About recognition
About authentication
About portable telephone
About Information Management
About Smartphone
About identity authentication
About digital signature
About electronic certificate
About Data protection
About Code theory
About 携帯端末
About 電子証明書
About 発行
About 提案