mirror of https://github.com/zcash/zips.git
Separate viewing keys (a_pk, sk_enc) from receiving keys sk_enc.
Also fix a minor error in the specification of note decryption. Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood
parent
8a36de79df
commit
fb456b8a38
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@ -363,6 +363,8 @@ electronic commerce and payment, financial privacy, proof of work, zero knowledg
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\newcommand{\paymentAddresses}{\term{payment addresses}}
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@ -480,6 +482,7 @@ electronic commerce and payment, financial privacy, proof of work, zero knowledg
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|
||||
\newcommand{\SpendingKeyLeadByte}{\hexint{AB}}
|
||||
\newcommand{\SpendingKeySecondByte}{\hexint{36}}
|
||||
\newcommand{\PtoSHAddressLeadByte}{\hexint{1C}}
|
||||
|
|
@ -1051,9 +1054,9 @@ A \paymentAddress includes two public keys: a \payingKey matching that of \notes
|
|||
sent to the address, and a \transmissionKey for a key-private asymmetric encryption
|
||||
scheme. ``Key-private'' means that ciphertexts do not reveal information about
|
||||
which key they were encrypted to, except to a holder of the corresponding
|
||||
private key, which in this context is called the \viewingKey. This facility is
|
||||
private key, which in this context is called the \receivingKey. This facility is
|
||||
used to communicate encrypted output \notes on the \blockchain to their
|
||||
intended recipient, who can use the \viewingKey to scan the \blockchain for
|
||||
intended recipient, who can use the \receivingKey to scan the \blockchain for
|
||||
\notes addressed to them and then decrypt those \notes.
|
||||
|
||||
The basis of the privacy properties of \Zcash is that when a \note is spent,
|
||||
|
|
@ -1201,7 +1204,8 @@ $\PoWMaxAdjustUp$ will also be defined in that section.
|
|||
\sproutonly{
|
||||
A \keyTuple $(\AuthPrivate, \TransmitPrivate, \PaymentAddress)$ is
|
||||
generated by users who wish to receive payments under this scheme.
|
||||
The \viewingKey $\TransmitPrivate$ and the \paymentAddress
|
||||
The \receivingKey $\TransmitPrivate$, the \viewingKey
|
||||
$\ViewingKey = (\AuthPublic, \TransmitPrivate)$, and the \paymentAddress
|
||||
$\PaymentAddress = (\AuthPublic, \TransmitPublic)$ are derived from the
|
||||
\spendingKey $\AuthPrivate$.
|
||||
}
|
||||
|
|
@ -2484,8 +2488,9 @@ out-of-band, which are not addressed in this document.
|
|||
|
||||
\nsubsubsection{Decryption by a Recipient}
|
||||
|
||||
Let $\PaymentAddress = (\AuthPublic, \TransmitPublic)$ be the recipient's
|
||||
\paymentAddress, and let $\TransmitPrivate$ be the recipient's \viewingKey.
|
||||
Let $\ViewingKey = (\AuthPublic, \TransmitPrivate)$ be the recipient's \viewingKey,
|
||||
and let $\TransmitPublic$ be the corresponding \transmissionKey derived from
|
||||
$\TransmitPrivate$ as specified in \crossref{keycomponents}.
|
||||
|
||||
Let $\cmNew{\allNew}$ be the \noteCommitments of each output coin.
|
||||
|
||||
|
|
@ -2497,7 +2502,7 @@ component as follows:
|
|||
\begin{itemize}
|
||||
\item Let $\DHSecret{i} := \KAAgree(\TransmitPrivate, \EphemeralPublic)$.
|
||||
\item Let $\TransmitKey{i} := \KDF(i, \hSig, \DHSecret{i}, \EphemeralPublic,
|
||||
\TransmitPublicNew{i})$.
|
||||
\TransmitPublic)$.
|
||||
\item Return $\DecryptNote(\TransmitKey{i}, \TransmitCiphertext{i}, \cmNew{i},
|
||||
\AuthPublic).$
|
||||
\end{itemize}
|
||||
|
|
|
|||
Loading…
Reference in New Issue