Symmetric Key Exchange: Lightweight Alternatives for a Post-Quantum IoT
summary
Proposes five symmetric authenticated key-exchange protocols that run with one, two or three messages, claim full forward secrecy for pre-shared keys by evolving keys instead of rekeying, and reduce message-counts versus prior work. Uses linear key-evolution for three variants (including LP2 as a two-message protocol) and a non-linear design based on a puncturable PRF to prove bounded gap synchronization and full synchronization robustness; security proofs are game-based and implementations are in progress.
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chapters (12)
- 0:00Introduction
- 1:50Speaker background
- 3:59Symmetric key exchange challenges
- 5:04Authenticated key exchange with linear evolution
- 9:22LP2 protocol
- 13:37Beyond linear key evolution
- 17:53Puncturable PRFs explained
- 20:47Comparison with existing protocols
- 21:50Symmetric crypto’s post-quantum role
- 23:43Q&A
- 27:44Puncturable PRFs discussion
- 31:15Closing remarks
