Security key or digital signature file that verifies a user's identity; used for decrypting a file encrypted with Pretty Good Privacy (PGP) software; ensures that protected files can only be opened by authorized users.
Program(s) that open pgp files
Mac / Windows: PGP Desktop; Other PGP Encryption software
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/pgp
