This book constitutes revised selected papers from the First International Conference on Cryptography and Information Security in the Balkans, Balkan Crypt Sec 2014, held in Istanbul, Turkey, in October 2014.

The 15 papers presented in this volume were carefully reviewed and selected from 36 submissions. They were organized in topical sections named: symmetric cryptography, cryptographic hardware, cryptographic protocols and public key cryptography. The book also contains one invited talk in full paper length.

This book constitutes the thoroughly refereed post-conference proceedings of the 20th International Conference on Financial Cryptography and Data Security, FC 2016, held in Christ church, Barbados, in February 2016. The 27 revised full papers and 9 short papers were carefully selected and reviewed from 137 full papers submissions.