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update hash_to_curve

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callebtc
2022-10-10 19:00:33 +02:00
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docs/specs/cashu_client_spec.md
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@@ -17,12 +17,12 @@ Mint: `Bob`
# Blind Diffie-Hellmann key exchange (BDH)
- Mint `Bob` publishes `K = kG`
- `Alice` picks secret `x` and computes `Y = hash_to_point(x)`
- `Alice` picks secret `x` and computes `Y = hash_to_curve(x)`
- `Alice` sends to `Bob`: `T = Y + rG` with `r` being a random nonce
- `Bob` sends back to `Alice` blinded key: `Q = kT` (these two steps are the DH key exchange)
- `Alice` can calculate the unblinded key as `Q - rK = kY + krG - krG = kY = Z`
- Alice can take the pair `(x, Z)` as a token and can send it to `Carol`.
- `Carol` can send `(x, Z)` to `Bob` who then checks that `k*hash_to_point(x) == Z`, and if so treats it as a valid spend of a token, adding `x` to the list of spent secrets.
- `Carol` can send `(x, Z)` to `Bob` who then checks that `k*hash_to_curve(x) == Z`, and if so treats it as a valid spend of a token, adding `x` to the list of spent secrets.
# Cashu client protocol