This volume contains the proceedings of the 8th International Information - curity Conference (ISC 2005), which took place in Singapore, from 20th to 23rd September 2005. ISC 2005 brought together individuals from academia and - dustry involvedin manyresearchdisciplines of information security to foster the exchange of ideas. During recent years this conference has tried to place special emphasis on the practical aspects of information security, and since it passed from being an international workshop to being an international conference in 2001, it has become one of the most relevant forums at which researchers meet and discuss emerging security challenges and solutions. Advised by the ISC Steering Committee, and in order to provide students with more opportunities for publication, ISC 2005 accepted extra student papers - sides the regular papers. The initiative was very well accepted by the young sector of the scienti?c community, and we hope that the success of this idea will remainfornextISCevents. AnotherimportantfactorforthesuccessofISC2005 was that selected papers in the proceedings will be invited for submission to a special issue of the InternationalJournalof InformationSecurity. The result was an incredible response to the call for papers; we received 271 submissions, the highest since ISC events started. It goes without saying that the paper selection process was more competitive and di?cult than ever before — only 33 regular papers were accepted, plus 5 student papers for a special student session.