This book constitutes the refereed proceedings of the International Conference on Applications and Techniques in Information Security, ATIS 2015, held in Beijing, China, in November 2015.  The 25 revised full papers and 10 short papers presented were carefully reviewed and selected from 103 submissions. The papers are organized in topical sections on invited speeches; cryptograph; evaluation, standards and protocols; trust computing and privacy protection; cloud security and applications; tools and methodologies; system design and implementations.