Trustcom 2015 was held in Helsinki, Finland during 20th-22rd, August 2015. It was held with other two conferences. International Symposium on Parallel and Distributed Processing with Applications and International Conference on Big Data Science and Engineering. So it was a great joint conference events (IEEE TrustCom-ISPA-BigDataSE 2015). The purpose was to provide a place for exchanging and developing new ideas in the field of trust, security and privacy, distributed and parallel processing and Big Data. Trustcom consisted of three tracks, trust track, security tracks and privacy track. There were 278 paper submitted and 79 paper finally accepted, the acceptance rate is about 28%. For the three conferences joint events, there were about 200 hundreds participants. The papers appread in the presentation covers cryptography theory, crygraphic applications, network security, distributed computing system, cloud computing, database techniques and big data related new technology.