$ cat > anus
I thereby relinquish my role of guardian of the anus.
$ gpg --detach-sign -a anus
You need a passphrase to unlock the secret key for
user: "The Guardian <guardian@anus>"
4096-bit RSA key, ID 00000000, created 2012-01-01
$ ls
anus anus.asc
$ cat anus.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
iQIc...cQE
-----END PGP SIGNATURE-----
$ gpg --list-packets anus.asc
:signature packet: algo 1, keyid 0000000000000000
version 4, created 1354484986, md5len 0, sigclass 0x00
digest algo 3, begin of digest a1 45
hashed subpkt 2 len 4 (sig created 2012-12-02)
subpkt 16 len 8 (issuer key ID 0000000000000000)
data: [4095 bits]
$ pgpdump anus.asc
Old: Signature Packet(tag 2)(540 bytes)
Ver 4 - new
Sig type - Signature of a binary document(0x00).
Pub alg - RSA Encrypt or Sign(pub 1)
Hash alg - RIPEMD160(hash 3)
Hashed Sub: signature creation time(sub 2)(4 bytes)
Time - Sun Dec 2 16:49:46 EST 2012
Sub: issuer key ID(sub 16)(8 bytes)
Key ID - 0x0000000000000000
Hash left 2 bytes - d2 67
RSA m^d mod n(4095 bits) - ...
-> PKCS-1
$