doc update

doc/crypt.tex

@@ -600,7 +600,7 @@ As of this release the current cipher\_descriptors elements are the following:
 \index{Cipher descriptor table}
 \index{blowfish\_desc} \index{xtea\_desc} \index{rc2\_desc} \index{rc5\_desc} \index{rc6\_desc} \index{saferp\_desc} \index{aes\_desc} \index{twofish\_desc}
 \index{des\_desc} \index{des3\_desc} \index{noekeon\_desc} \index{skipjack\_desc} \index{anubis\_desc} \index{khazad\_desc} \index{kseed\_desc} \index{kasumi\_desc} \index{camellia\_desc} \index{aes\_enc\_desc}
-\index{idea\_desc}
+\index{idea\_desc} \index{serpent\_desc}
 \begin{figure}[hpbt]
 \begin{small}
 \begin{center}
@@ -626,6 +626,7 @@ As of this release the current cipher\_descriptors elements are the following:
      \hline KASUMI & kasumi\_desc & 8 & 16 & 8 \\
      \hline Camellia & camellia\_desc & 16 & 16, 24, 32 & 18, 24 \\
      \hline IDEA & idea\_desc & 8 & 16 & 8 \\
+     \hline Serpent & serpent\_desc & 16 & 16, 24, 32 & 32 \\
      \hline
 \end{tabular}
 \end{center}