PQ Migration for Privacy Protocols: Kohaku Case Studies
Original title: You can't withdraw your privacy: PQ analysis of Kohaku privacy protocols
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Summary
The talk contrasts post-quantum migration for signature schemes with that for privacy-preserving cryptography. It says privacy protocols face a different challenge: many cryptographic primitives used for transaction confidentiality today lack forward secrecy. A future quantum adversary could therefore retrospectively decrypt the entire history of private on-chain transactions, revealing information users expected to remain confidential, a scenario described as "Harvest Now, Decrypt Later." Using privacy protocols integrated in Kohaku as case studies, the talk compares their resilience to quantum attacks, identifies their security assumptions, and presents practical migration paths based on post-quantum cryptographic standards. It also explains why signature schemes and privacy-preserving cryptography have different migration requirements. Simon speaks in the Applied Cryptography track.
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Key points
- The talk says privacy protocols face a different post-quantum challenge than signature schemes.
- Many cryptographic primitives used for transaction confidentiality today do not provide forward secrecy, according to the source.
- A future quantum adversary could retrospectively decrypt the entire history of private on-chain transactions, a scenario called "Harvest Now, Decrypt Later."
- Privacy protocols integrated in Kohaku are used as case studies to compare resilience against quantum attacks and identify security assumptions.
- The talk presents practical migration paths based on post-quantum cryptographic standards.
- Signature schemes and privacy-preserving cryptography have different migration requirements in the post-quantum transition.
Questions
What does "Harvest Now, Decrypt Later" refer to in the talk?
A future quantum adversary retrospectively decrypting the entire history of private on-chain transactions, revealing information users expected to remain confidential.
Which privacy protocols are used as case studies?
The privacy protocols integrated in Kohaku.
What migration paths does the talk present?
Practical migration paths based on post-quantum cryptographic standards.
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