This book constitutes the thoroughly refereed post-conference proceedings of the 19th International Conference on Financial Cryptography and Data Security FC 2014 held in San Juan Puerto Rico in January 2015. The 23 revised full papers and 10 short papers were carefully selected and reviewed from 102 full papers submissions. The papers are grouped in the following topical sections: sidechannels; cryptography in the cloud; payment and fraud detection; authentication and access control; cryptographic primitives; mobile security; privacy and incentives; applications and attacks; authenticated data structures.