The 16th International Workshop on Information Security Applications (WISA 2015) was held on Jeju Island, Korea on August 20-22, 2015. It was hosted by the Korea Institute of Information Security and Cryptology (KIISC) and had sponsored by the Ministry of Science, ICT and Future Planning (MSIP). The workshop has received 68 submissions from 12 countries, covering all areas of information security, and finally selected 35 outstanding paper form 8 countries through severe reviewing processes. In additional, there were about 120 participants joined this year.