Blockchain and Cryptography Research Dr Zeki Erkin Assistant

Blockchain and Cryptography Research Dr. Zeki Erkin Assistant Professor Cyber Security Group / Blockchain Lab Dep. Intelligent Systems Delft University of Technology 1

Assist. Prof. dr. Zekeriya Erkin • Information Security and Privacy • Research Interest • Processing Sensitive Data • Secure Information Sharing • Distributed Trust • Teaching • Security and Cryptography (Graduate) • Privacy Enhancing Technologies (Graduate) • Blockchain Engineering (Graduate) • Blockchain Research: 1 PD, 1 Ph. D, +6 MSc, and 1 SP, +20 BSc 2

Blockchain: A Disruptive Technology • Not only about applications • Multi-disciplinary: • Computer Science, Mathematics, Economics • Promising and yet, many problems to solve • Scalability/throughput • Efficient security and privacy solutions • Mismatch between worlds • Honest vs Rational behaviour 3

Blockchain @TUD Distributed Generators • Smart Grids (Block. Lab, CGI and 3 ME) • Micro-grids • De-centralization Consumers and Prosumers Service Providers Market and Simulation Models Grid Components • Electric Cars and Batteries • Load balancing • Incentives • Game theory 4

Blockchain @TUD • Supply Chain/Logistics (Block. Lab) • Multiple actors/countries • Costs • Trust • Traceability • Privacy image source: maritime herald 5

Core Problems • Privacy • anonymity • unlinkability • Security • authentication (lightweight/Io. T devices) • Scalability • consensus protocols • leadership election • propagation • Honest vs Rational Behaviour • incentives 6

De. Couples • Traceability vs Privacy • Privacy solutions: Monero, ZCash, Dash, … • De. Couples • Stealth addresses, Signature Schemes (MLSIG, Schorr) • Hiding Transaction Amounts • Hiding Privacy-sensitive Information • the PASTA protocol Alice (p i d ) Bob ( A , B , T K p i d ) Request T K p i d for p i d T Kp i d Hs (pi d a)tt (A, B , T K p i d ) r 2 R Zp R rtt P Hs (r. TKp i d )tt + B (R, P ) P 0 H s ( t k p i d R ) t t + B P 0=? P x Hs (tkp i d R)+ b 7

Prototypes • Dox. Chain: Emission Trade Market • Secure/Privacy-preserving • De. Couples: Traceable Privacy-Preserving SCM • De-centralized Container Market • e. Xchain: De-centralized Energy Trading A Digital Passport for Containers • pass. Port: Container Tracking System, Hyperledger 8

Take away message… • Blockchain is a not only about applications • Multi-disciplinary research: EWI-TBM • Traceability, Anonymity, Confidentiality and Energy! • Research on Blockchain and Cryptography • Industry driven • Curiosity driven • Already established a growing research group @TUD • Collaboration: CGI, RUN, Block. Lab, CSA, and BC 3 9

Thank you! z. erkin@tudelft. nl Dr. Ren Ersoy Hijgenaar, Valling, Bijgelaar, Hoogland, el Maouchi, van der Laan Lycklama, Oudejans, Vos, Bijman, Pigmans, Raateland, Overweel, Li 10