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Make a reused Sentinel or pairing PSK a pairing protocol error #311

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Make a reused Sentinel or pairing PSK a pairing protocol error #311

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -1102,7 +1102,7 @@ with `label` `"sendspin-pair-psk-wrap-v1"` for `wrapped_psk` and `"sendspin-pair

### Protocol Errors

A condition during pairing that no conformant peer produces - a malformed or missing field, a CPace share with the wrong length or encoding a low-order point, a revealed nonce that does not match its commitment, an entered code that fails the binding check, a `wrapped_nonce_B` or `wrapped_psk` that fails to decrypt - is a **protocol error**: the detecting side closes the WebSocket without sending any application-level error message, and persists nothing.
A condition during pairing that no conformant peer produces - a malformed or missing field, a CPace share with the wrong length or encoding a low-order point, a revealed nonce that does not match its commitment, an entered code that fails the binding check, a `wrapped_nonce_B` or `wrapped_psk` that fails to decrypt, a delivered long-term PSK equal to the Sentinel PSK or to the pairing PSK the connection is keyed by - is a **protocol error**: the detecting side closes the WebSocket without sending any application-level error message, and persists nothing.

### Client → Server: `client/hello` pair-method descriptor

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2 changes: 1 addition & 1 deletion pairing.md
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Expand Up @@ -300,7 +300,7 @@ with `label` `"sendspin-pair-psk-wrap-v1"` for `wrapped_psk` and `"sendspin-pair

### Protocol Errors

A condition during pairing that no conformant peer produces - a malformed or missing field, a CPace share with the wrong length or encoding a low-order point, a revealed nonce that does not match its commitment, an entered code that fails the binding check, a `wrapped_nonce_B` or `wrapped_psk` that fails to decrypt - is a **protocol error**: the detecting side closes the WebSocket without sending any application-level error message, and persists nothing.
A condition during pairing that no conformant peer produces - a malformed or missing field, a CPace share with the wrong length or encoding a low-order point, a revealed nonce that does not match its commitment, an entered code that fails the binding check, a `wrapped_nonce_B` or `wrapped_psk` that fails to decrypt, a delivered long-term PSK equal to the Sentinel PSK or to the pairing PSK the connection is keyed by - is a **protocol error**: the detecting side closes the WebSocket without sending any application-level error message, and persists nothing.

### Client → Server: `client/hello` pair-method descriptor

Expand Down
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