COMM trapdoor -> commitment trapdoor.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

protocol/protocol.tex

@@ -383,7 +383,7 @@
 \newcommand{\NP}{\mathsf{NP}}
 \newcommand{\treepath}[1]{\mathsf{path}_{#1}}
 \newcommand{\COMM}[1]{\mathsf{COMM}_{#1}}
-\newcommand{\COMMtrapdoor}{\term{\textsf{COMM} trapdoor}}
+\newcommand{\commitmentTrapdoor}{\term{commitment trapdoor}}
 \newcommand{\Commitment}{\mathtt{NoteCommitment}}
 \newcommand{\Uncommitted}{\mathsf{Uncommitted}}
 \newcommand{\Receive}{\mathsf{Receive}}
@@ -541,7 +541,7 @@ to $\AuthPublic$, as described in the previous section.
         ($1$ \ZEC = $10^8$ \zatoshi).
     \item $\NoteAddressRand$ is a sequence of $\PRFOutputLength$ bytes, which is
         used as input to $\PRFnf{\AuthPrivate}$ to obtain the \note's \nullifier.
-    \item $\NoteCommitRand$ is a \COMMtrapdoor.
+    \item $\NoteCommitRand$ is a \commitmentTrapdoor.
 \end{itemize}
 
 $\NoteCommitRand$ is randomly generated by the sender. \changed{$\NoteAddressRand$
@@ -1527,7 +1527,7 @@ such that bit $b$ has numeric weight $2^b$.
     \item $\Value$ is a 64-bit unsigned integer representing the value of the
         \note in \zatoshi ($1$ \ZEC = $10^8$ \zatoshi).
     \item $\NoteAddressRand$ is a 32-byte $\PRFnf{\AuthPrivate}$ preimage.
-    \item $\NoteCommitRand$ is a 32-byte \COMMtrapdoor.
+    \item $\NoteCommitRand$ is a 32-byte \commitmentTrapdoor.
 \end{itemize}
 
 \nsubsection{\NoteCommitments} \label{concretecomm}