Introduction to Secret Sharing

Stephan Krenn received his PhD in computer science from the University of Fribourg (Switzerland). After postdoc positions at IST Austria and IBM Research - Zurich, he joined AIT's cryptography group in 2015, where he is now a senior scientist. His main research interests are in the domain of privacy-enhancing technologies, anonymous authentication, malleable digital signatures, or similar. He is actively participating in cryptographic standardization initiatives, and chair of IFIP WG11.6 on Identity Management.Thomas Lorünser is a senior scientist and team leader in AIT’s Center for Digital Safety & Security with a strong background in digitization, IT security and applied cryptography. He holds a degree from Technical University of Vienna and various professional certifications (CISSP, zPM, CDPSE, ..). Additionally, he teaches selected topics in Cloud Computing, Internet of Things and IT Security and also actively contributes to security and cryptography standards in the International Organization for Standardization (ISO, JTC1/SC27).

• 1 Introduction.- 2. Preliminaries.- 3. Adversary Model for Secret Sharing Schemes.- 4. Basic Secret Sharing.- 5. Beyond Threshold Access Structures.- 6. Robust Secret Sharing.- 7. Verifiable Secret Sharing.- 8. Proactive Secret Sharing.- 9. Advanced Topics.- 10. Conclusion.