This book constitutes the refereed proceedings of the 15th IFIP TC 6/TC
11 International Conference on Communications and Multimedia Security,
CMS 2014, held in Aveiro, Portugal, in September 2014.
The 4 revised full papers presented together with 6 short papers, 3
extended abstracts describing the posters that were discussed at the
conference, and 2 keynote talks were carefully reviewed and selected
from 22 submissions. The papers are organized in topical sections on
vulnerabilities and threats, identification and authentification,
applied security.