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To realize ubiquitous computing, mobile computers such as PDAs and smart phones will be important components. However, the mobile computers tend to be used without authentication because they should be usable as soon as the power becomes on. In this paper, we propose an authentication method without losing the usability of PDA. With this method, the user is authenticated using the pen pressure pattern measured by tracing the symbols which are displayed on the screen with stylus. From the analyses of pen pressure patterns using self organizing maps, the symbols which are suitable for authentication are selected. 70% of the users can be authenticated by this method from the authentication experiments using the symbols.