server, or server is connecting to a router the Mutual Authentication
flag may be omitted. However, if the connection authentication protocol
for the connecting entity is not based on public key authentication (it
-is based on passphrase) then it is RECOMMENDED that Mutual Authentication
-flag is enabled. This way the connecting entity has to provide proof
-of posession of the private key for the public key it will provide in
+is based on passphrase) then the Mutual Authentication flag SHOULD be
+enabled. This way the connecting entity has to provide proof of
+posession of the private key for the public key it will provide in
SILC Key Exchange protocol.
When performing re-key with PFS selected this is the only payload that