or can be "." to check against the local node's public key,
or "*" to allow a signature from any node whose public key is known.
If no @var{filename} is given, the file is read from standard input.
or can be "." to check against the local node's public key,
or "*" to allow a signature from any node whose public key is known.
If no @var{filename} is given, the file is read from standard input.