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systemslibrarian / crypto-lab-ot-gate

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Browser-based 1-of-2 Oblivious Transfer — the Simplest OT protocol (Chou-Orlandi 2015) over Curve25519 with real Edwards25519 (Ed25519) point arithmetic and AES-256-GCM encryption. Receiver gets exactly one message, sender learns nothing about which. Foundational primitive for secure MPC. Part of crypto-lab.

cryptography mpc curve25519 x25519 diffie-hellman secure-computation ot-extension oblivious-transfer ddh crypto-lab cryptography-education simplest-ot
  • Updated Oct 1, 2026
  • TypeScript

systemslibrarian / crypto-lab-psi-gate

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Browser-based Private Set Intersection demo implementing classic DH-PSI (Meadows 1986, Huberman-Franklin-Hogg 1999) over ristretto255 with RFC 9380 hash-to-curve. The primitive behind Signal contact discovery and Apple password monitoring.

cryptography psi diffie-hellman secure-computation signal-protocol contact-discovery privacy-preserving ddh ristretto255 private-set-intersection crypto-lab secure-multiparty-computation hash-to-curve rfc-9380 noble-curves secure-two-party-computation dh-psi
  • Updated Oct 1, 2026
  • TypeScript

systemslibrarian / crypto-lab-function-key

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Browser-based inner-product functional encryption demo — ABDP15 (PKC 2015) over ristretto255. A key releasing only ⟨x, y⟩ beside one releasing the whole vector, the baby-step giant-step bottleneck measured in group operations, exact reconstruction from enough keys. Issue one key too many and you hand over the master secret.

cryptography functional-encryption ddh ristretto255 crypto-lab inner-product-encryption cryptography-education
  • Updated Sep 30, 2026
  • TypeScript

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