This is called PGP and S/MIME. Both are valid IETF RFC. >From an industry point of view, S/MIME seems to be the one that will survive in the long run, because it is implemented in nearly all mail clients and follows the certificates used in SSL/TLS which is widely adopted (IPSec to name only one). However, none of them is widely implemented for e-mail purposes because of problems to build a global PKI (in short). I still haven't found a company that will give/sell me a certificate that allows me to sign my organisational e-mails certificates. ISOC is working on it... Cheers. > -----Original Message----- > From: Gary Lawrence Murphy [mailto:garym@canada.com] > Sent: Friday, 25 October 2002 11:19 > To: Franck Martin > Cc: 'TOMSON ERIC'; 'ietf@ietf.org'; 'isdf@isoc.org' > Subject: Re: [isdf] RE: Palladium (TCP/MS) > > Isn't that PGP? >