Detect PGP encrypted files

[Filip]

Hi,

How can I detect PGP encrypted files? I have noticed that the third, forth
and fifth bytes are always 'PGP' .. but I prefer to have a better signature
.. 3 bytes are not enough and may cause false positives ... so can you
please tell me how to better detect PGP encrypted files and is there a
specification document for the PGP format other than the one here:
http://tools.ietf.org/html/rfc4880


Is there any other data encryption methods like PGP which are famously used
to encrypt files?


Thanks
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