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ZIP 32: Simplify Orchard internal key derivation diagram. 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2022-01-12 20:56:02 +00:00
parent d27d2fd836
commit 61223ae9b0
3 changed files with 204 additions and 356 deletions
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12
zip-0032.rst
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@ -449,11 +449,8 @@ procedure on non-hardened derivation, which is not defined for Orchard. We can o
desired separation of viewing authority by modifying only the :math:`\mathsf{rivk_{internal}}`
field relative to the external full viewing key, which results in different
:math:`\mathsf{dk_{internal}}`, :math:`\mathsf{ivk_{internal}}` and :math:`\mathsf{ovk_{internal}}`
fields being derived, as specified in [#protocol-orchardkeycomponents]_.
The values of :math:`K` and :math:`\mathsf{rivk_{internal}}` are the same between deriving
a full viewing key, and deriving the corresponding spending key. Both of these derivations
are shown in the following diagram:
fields being derived, as specified in [#protocol-orchardkeycomponents]_ and shown in the following
diagram:
.. figure:: zip-0032-orchard-internal-key-derivation.png
:width: 720px
@ -462,11 +459,6 @@ are shown in the following diagram:
Diagram of Orchard internal key derivation, also showing derivation from the parent extended spending key
Note that there does not exist an :math:`\mathsf{sk}` that directly generates the internal key
components by the procedure described in [#protocol-orchardkeycomponents]_. A similar effect
could be obtained by storing a flag that indicates external or internal usage along with the
original :math:`\mathsf{sk}`, but we do not define a specific format for this.
This method of deriving internal keys is applied to external keys that are children of the
Account level. It was implemented in `zcashd` as part of support for ZIP 316 [#zip-0316]_.