White Paper The Next Generation of Data-Sharing in Financial Services: Using Privacy Enhancing Techniques to Unlock New Value Prepared in collaboration with Deloitte September 2019 World Economic Forum 91-93 route de la Capite CH-1223 Cologny/Geneva Switzerland Tel.: +41 (0)22 869 1212 Fax: +41 (0)22 786 2744 Email:
[email protected] www.weforum.org This white paper has been published by the World Economic Forum as a contribution to a project, © 2019 World Economic Forum. All rights insight area or interaction. The findings, interpretations and conclusions expressed herein are a re- reserved. No part of this publication may be sult of a collaborative process facilitated and endorsed by the World Economic Forum, but whose reproduced or transmitted in any form or by any results do not necessarily represent the views of the World Economic Forum, nor the entirety of its means, including photocopying and recording, or Members, Partners or other stakeholders. by any information storage and retrieval system. Contents Foreword 4 Introduction 5 Chapter 1: Privacy in the financial sector 6 The benefits of data-sharing 6 The potential drawbacks of data-sharing 6 Changing the dynamics of data-sharing 6 Chapter 2: Privacy enhancing techniques 8 Technique #1: Differential privacy 9 Technique #2: Federated analysis 11 Technique #3: Homomorphic encryption 13 Technique #4: Zero-knowledge proofs 15 Technique #5: Secure multiparty computation 17 Chapter 3: Applications in financial services 20 Unlocking new value for financial institutions 20 Unlocking