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ZIP 312: Initial draft of key generation
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@ -142,10 +142,26 @@ Key Generation
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--------------
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While key generation is out of scope for this ZIP and the FROST spec [#FROST]_,
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it needs to be consistent with FROST, see [#frost-tdkg]_ for guidance. The spend
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authorization private key :math:`\mathsf{ask}` [#protocol-spendauthsig]_ is the
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particular key that must be used in the context of this ZIP. Note that the
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:math:`\mathsf{ask}` is usually derived from the spending key
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it needs to be consistent with FROST; see [#frost-tdkg]_ for general guidance.
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To define a spending or viewing key that uses FROST, the Sapling and Orchard key
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trees [#protocol-saplingkeycomponents]_ [#protocol-orchardkeycomponents]_ are
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adjusted as follows:
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- The Spend validating key :math:`\mathsf{ak}` is replaced by the FROST group
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public key `PK` [#frost-protocol]_.
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- The Spend authorizing key :math:`\mathsf{ask}` is replaced by the logical
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signing key that corresponds to the group public key `PK`. By design, this
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key never exists, and instead is represented by each participant's FROST
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signing key share `sk_i`.
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The remaining parts of the Sapling and Orchard key trees are generated from
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a common... (TODO: Finish specifying how the other common parts of the
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Sapling and Orchard key trees are derived for participants, perhaps in terms
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of a common `sk` or a common HD path.)
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(Old remaining content below, which might change after the above TODO.)
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Note that the :math:`\mathsf{ask}` is usually derived from the spending key
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:math:`\mathsf{sk}`, though that is not required. Not doing so allows using
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distributed key generation, since the key it generates is unpredictable. Note
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however that not deriving :math:`\mathsf{ask}` from :math:`\mathsf{sk}` prevents
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