The best syntax for multiple files is to zip them first, and then gpg the zipped single file :).

Note that if you're dealing with U.S. government standards, DSA/ElGamal keys are right out, as ElGamal is not a FIPS 140-2 algorithm.

To be as current as possible, ideally, generate your key with

gpg2 --gen-key --cert-digest-algo SHA512

or

gpg2 --gen-key --cert-digest-algo SHA256

and add the following four lines to the end of gpg.conf for every user that uses gpg

Substitute CAMELLIA for AES if you're in Europe or Japan.

personal-cipher-preferences AES256 AES192 AES 3DES

personal-digest-preferences SHA512 SHA384 SHA256 SHA224

personal-compress-preferences BZIP2 ZLIB ZIP Uncompressed

default-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES 3DES BZIP2 ZLIB ZIP Uncompressed

To update existing public keys with at least a preferred cipher ordering,

gpg2 --edit-key "YourKeyName <YourKey@X.Y>"

showpref

setpref SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES 3DES BZIP2 ZLIB ZIP Uncompressed

quit

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