The 3rd Workshop on Nano Security has been successfully organized at the Design Automation and Test in Europe Conference on April 2 in Lyon. The workshop had an attractive program that included a keynote by Professor Massimilano Di Ventra on MemComputing and its implications for security; two technical sessions on secure emerging technologies and on physical attacks; and a poster session on the projects from the DFG Priority Program SPP 2253 Nano Security.