Topics on Secure Architectures (TOSAR) is a scientific symposium focused on practical aspects of Cryptography and Information Security. TOSAR 2018 aims to bring together specialists and researchers from both the Academia and Industry, with the main scope of disseminating the latest research results and trends. Even though it primarily deals with hardware implementations, system validation and experiments, innovative theoretical aspects are also welcome. By its unique structure, the event mixing together technical oral presentations, poster session and a supplementary exhibition of Inventics (TOSAR-INVENT) promoting the pending/granted patents registered in the field of Cryptography/Information Security, TOSAR is intended to become a flagship event of IEEE SSCS Romania. In addition, companies involved in the Security field are invited to present their products and services at a separate exhibition. The symposium will be held in Iasi (Romania), an important cultural, scientific and economic Romanian pole.