On behalf of the Organizing Committee, it is our great pleasure to welcome you to Taipei and the 2009 International Workshop on Cryptography and Network Security, held on December 14-15 in Taipei. Thank you all for coming to our workshop, especially to the speakers of the technical program from all over the world.
 Cryptography and Security are fast-moving fields where things change quickly and unpredictably, and workshops are the place to keep yourself abreast of new developments. On topics ranging from theoretical cryptography to the most practical applications in network and systems security, we hope that local participants will get the maximum opportunity to see the latest trends in the field, not to mention mingle and rub elbows and share their views with visiting experts during this workshop – the technical talks, the breaks, as well as the reception on the evening of the 14th and the banquet on the 15th. 
 For most of the participants, Taipei will be a comfortable temperature during mid-December. Enjoy your stay in Taipei and wish you all a successful professional experience at this event. We look forward to meeting you in December in Taipei.
General Chair
Der-Tsai Lee, Director, Taiwan Information Security Center