Thesearetheproceedingsofthe7thWorkshoponCryptographic Hardwareand EmbeddedSystems(CHES2005)heldinEdinburgh, ScotlandfromAugust29to September1,2005.TheCHESworkshophasbeensponsoredbytheInternational Association for Cryptologic Research (IACR) for the last two years. We received a total of 108 paper submissions for CHES 2005. The doub- blindreviewprocessinvolveda27-memberprogramcommittee anda largen- ber of external sub-referees. The review process concluded...