Enhancing Security with Multi-Instance Randomness Extraction
Explore the intricate concepts of randomness extraction, forward secrecy, incompressible encryption, and more for robust security against mass surveillance. Learn about advanced protocols, constructions, and results in the realm of cryptography and data protection.
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Presentation Transcript
Multi-Instance Randomness Extraction and Security against Bounded-Storage Mass Surveillance JIAXIN GUAN JIAXIN GUAN1, DANIEL WICHS2, AND MARK ZHANDRY3 1 PRINCETON UNIVERSITY -> NEW YORK UNIVERSITY 2 NORTHEASTERN UNIVERSITY & NTT RESEARCH, INC. 3 NTT RESEARCH, INC.
Forward Secrecy [Gn90] Hi, Bob! Here is a super secret QR code. For your eyes only!!! Multi-Round Protocols Key Updates
What if the adversary cannot store the ciphertext?
Prior Constructions Incompressible SKE (rate 1) [BDD22] Incompressible SKE [Dzi06] Incompressible PKE [GWZ22] Seeded Extractor Incompressible PKE (rate 1, long pk) [BDD22] Incompressible PKE (rate 1, small pk) [GWZ22]
Our Result: Multi-Instance Randomness Extraction ?1 Ext( ; ) ?1 ?1 ? = (?1,?2, ,??) ? ?2 Ext( ; ) ?2 ?2 ?1 ?2 ?? ?3 ?? ?? Ext( ; ) ?? ?? ??
Our Result: Multi-Incompressible SKE & PKE Incompressible SKE (rate 1) [BDD22] SKE (rate 1) Multi-Incompressible Incompressible SKE [Dzi06] SKE Incompressible PKE [GWZ22] PKE Multi-Incompressible Multi-Incompressible Multi-Instance Randomness Seeded Extractor Extractor Incompressible PKE (rate 1, long pk) [BDD22] Incompressible PKE (rate 1, small pk) [GWZ22] Multi-Incompressible PKE (rate 1, long pk) Multi-Incompressible PKE (rate 1, small pk)
Additional Results Multiple Ciphertexts per User Random Oracle Model Optimal key and ciphertext sizes!
Thank you! eprint.iacr.org/2023/409 jiaxin@guan.io
