"The following is a description of how I got a Linux version of the PGP
encryption program, how I installed it, and a few observations about quirks in
the program. The Linux version of PGP that I got is
PGPcmdfw_6.5.2_Linux.i386.rpm and it offers the options of 1024 or 2048 bit
encryption. The 2048 bit option is compatible with people using PGP 2.6.2 with
an extra command that will be noted later in REMARKS and QUIRKS."
FULL STORY @ LINUXNEWBIE (http://linuxnewbie.org/nhf/intel/security/installpgp.html)