In this paper, an authentication system using keystroke dynamics is presented. We introduced pressure sensing for the improvement of the accuracy of measurement and durability against intrusion using key-logger, and so on, however additional instrument is needed. As the result, it has been found that the pressure sensing is also effective for estimation of real moment of keystroke.
 Francesco Bergadano, Daniele Gunetti, and Claudia Picardi, ''User authentication through keystroke dynamics,'' ACM Transaction on Information and system security (TISSEC), 5, 4, pp. 367-397, 2002.
 BioNet Systems/ Net Nanny/ Stanford Research Institute, ''BioPassword,'' http://www.biopassword.com.
 Neil Henderson, Neil White, Raymond Veldhuis, Pieter Hartel, and Kees Slump, ''Sensing pressure for authentication,'' Proceedings of 3rd IEEE Benelux Signal Processing Symposium (SPS-2002), 2002.
 Hidetoshi Nonaka, and Masahito Kurihara, ''Time-frequency decomposition in gesture recognition system using accelerometer,'' Knowledge-Based Intelligent Information and Engineering Systems,LNAI 3212 (8th Int. Conf. KES2004), pp. 1072-1078, 2004.
 Hidetoshi Nonaka, and Masahito Kurikara, ''Anticipatory matching method for query-based head gesture identification'', International Journal of Computing Anticipatory Systems, 13, 2004 (in print).