The 8th International Conference on Provable Security (ProvSec 2014) was held in Hong Kong, October 9-10, 2014. The conference was organized by The University of Hong Kong. This conference have received 68 submissions from 20 different countries. This figure is the second highest since the first ProvSec in 2007. The accepted papers and presentations covered the provable security research topics in both public key cryptography and symmetric key cryptography, also some papers about application-oriented cryptography. There were about 60 peoples attending the conference, mainly from Japan and China. There were a few researchers from Europe, such France, Switzerland, Estonia and Poland.