The INDOCRYPT series of conferences started in 2000. INDOCRYPT 2004 was the ?fth one in this series. The popularity of this series is increasing every year. The number of papers submitted to INDOCRYPT 2004 was 181, out of which 147 papers conformed to the speci?cations in the call for papers and, therefore, were accepted to the review process. Those 147 submissions were spread over 22 countries. Only 30 papers were accepted to this proceedings. We should note that many of the papers that were not accepted were of good quality but only the top 30 papers were accepted. Each submission received at least three independent - views. The selection process also included a Web-based discussion phase. We made e?orts to compare the submissions with other ongoing conferences around the world in order to ensure detection of double-submissions, which were not - lowed by the call for papers. We wish to acknowledge the use of the Web-based review software developed by Bart Preneel, Wim Moreau, and Joris Claessens in conducting the review process electronically. The software greatly facilitated the Program Committee in completing the review process on time. We would like to thank C´ edric Lauradoux and the team at INRIA for their total support in c- ?guring and managing the Web-based submission and review softwares. We are unable to imagine the outcome of the review process without their participation. This year the invited talks were presented by Prof. Colin Boyd and Prof.

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