Encryption for Gmail via Greasemonkey
Langenhoven offers a Greasemonkey script
for Firefox that will encrypt Gmail messages.
It achieves this by using RSA type encryption in Javascript.
The site also offers a utility
for producing the public and private keys needed for encryption.
I haven’t tested this but the results look like the real thing:

Read the Known Issues section to discover that it works best in Firefox 1.5 or greater and that some of the buttons are troublesome.
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Tags: email, encryption, FireFox, GMAIL, greasemonkey, private keys, public public, security

April 27th, 2007 at 8:34 pm
Here is an example how you can use JavaScript together with PGP PublicKey encryption.
http://www.anonymousspeech.com/how_to_secure_email_form.aspx