PGP has a tempest prevention font, although I don't know if it is effective.
PGP's TEMPEST-prevention font is certainly effective for what it offers, which is a way of displaying in fairly low contrast the text on screen. It makes for much more work for the van Eck tuner, trying to get his screen to show the text due to the low contrast.
However, PGP is extremely vulnerable to keystroke logging. Clipboard pasting your PGP password simply shifts the vulnerability to clipboard logging. And the PGP private key would seem to be something one could grab off the user's hard drive over the 'net.
As well, many people compose online. So, you have the vulnerability of a PGP message while it is being composed. It could be viewed in the composition stage either by 'net warez or by van Eck phreaking. Then it is encrypted and sent. It is nearly invulnerable as a set of data packets while it is transmitted, although these could be duplicated en route for the Ft. Meade supercomputers if passwords have been logged and private keys purloined.
Once it arrives at its destination it can be viewed in TEMPEST-secure font, but then the recipient goes to compose a reply. So, again, his reply can be viewed by 'net warez during composition and before encryption, or by van Eck phreaking.
In other words, PGP is a good idea. It is like putting an envelope around your letters instead of sending everything by postcard. But, just as with an envelope, it is a thin veil of privacy. It can be penetrated.
So, anyone who is writing things under PGP security that he wouldn't want anyone to read is probably making a dreadful mistake.
Regards,
Jim
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