The Third SKLOIS Conference on Information Security and Cryptology (- scrypt2007)wasorganizedbytheStateKeyLaboratoryofInformationSecurity of the Chinese Academy of Sciences in cooperation with Qinhai University for Nationalities. This international conference was held in Xining Qinhai Province of China and was sponsored by the Institute of Software the Chinese Academy of Sciences the Graduate University of the Chinese Academy of Sciences and the National Natural Science Foundations of China. By now Inscrypt (the International SKLOIS Conference on Information - curity and Cryptology) has become a tradition and it is in fact a leading event in this area which takes place annually in China. We are pleased with the continuous support by authors committee members reviewers sponsors and organizers. Indeed the research areas covered by Inscrypt are important since modern computing (including communication infrastructures and applications) requires increased security trust safety and reliability. This need has motivated the research community worldwide to produce important fundamental exp- imental and applied work in the wide areas of cryptography and information securityresearchin recent years.Accordingly the programof Inscrypt 2007c- ered numerous ?elds of research within these general areas.