The 9th International Workshop on Information Security Applications (WISA 2008) was held in Jeju Island, Korea during September 23-25, 2008. The wo- shop was sponsoredby the Korea Institute of Information Security and Crypt- ogy(KIISC), theElectronicsandTelecommunicationsResearchInstitute(ETRI) and the Ministry of Knowledge Economy (MKE). WISAaimsatprovidingaforumforprofessionalsfromacademiaandindustry to present their work and to exchange ideas. The workshop covers all technical aspects of security applications, including cryptographic and non-cryptographic techniques. We were...