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fix format
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@@ -5,24 +5,27 @@ Receiving user: `Carol`
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Mint: `Bob`
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## Bob (mint)
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- `k` private key of mint (one for each amount)
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- `K` public key of mint
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- `Q` promise (blinded signature)
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## Alice (user)
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- `x` random string (secret message), corresponds to point `Y` on curve
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- `r` private key (blinding factor)
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- `T` blinded message
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- `Z` proof (unblinded signature)
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# Blind Diffie-Hellmann key exchange (BDHKE)
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- Mint `Bob` publishes `K = kG`
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- `Alice` picks secret `x` and computes `Y = hash_to_curve(x)`
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- `Alice` sends to `Bob`: `T = Y + rG` with `r` being a random nonce
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- `Bob` sends back to `Alice` blinded key: `Q = kT` (these two steps are the DH key exchange)
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- `Alice` can calculate the unblinded key as `Q - rK = kY + krG - krG = kY = Z`
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- Alice can take the pair `(x, Z)` as a token and can send it to `Carol`.
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- `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.
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- Mint `Bob` publishes `K = kG`
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- `Alice` picks secret `x` and computes `Y = hash_to_curve(x)`
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- `Alice` sends to `Bob`: `T = Y + rG` with `r` being a random nonce
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- `Bob` sends back to `Alice` blinded key: `Q = kT` (these two steps are the DH key exchange)
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- `Alice` can calculate the unblinded key as `Q - rK = kY + krG - krG = kY = Z`
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- Alice can take the pair `(x, Z)` as a token and can send it to `Carol`.
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- `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.
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## 0.1 - Models
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@@ -99,6 +102,7 @@ This token format is a list of `Proof`s. Each `Proof` contains the keyset id in
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"secret": "d_PPc5KpuAB2M60WYAW5-Q",
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"C": "0270e0a37f7a0b21eab43af751dd3c03f61f04c626c0448f603f1d1f5ae5a7d7e6"
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}
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]
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```
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When serialized, this becomes:
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