This book constitutes the refereed proceedings of the Workshops and Symposiums of the 15th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 2015, held in Zhangjiajie, China, in November 2015.The program of this year consists of 6 symposiums/workshops that cover a wide range of research topics on parallel processing technology: (1) The Sixth International Workshop on Trust, Security and Privacy for Big Data (TrustData 2015)(2) The Fifth International Symposium on Trust, Security and Privacy for Emerging Applications (TSP 2015)(3) The Third International...