S/MIME and Digital Signatures
Using S/MIME to digitally signed email
You may have noticed that some e-mail messages that you receive contain a 'smime.p7s' or similarly named attachment. This attachment is part of S/MIME and digital signatures.
From RFC 2632
S/MIME (Secure/Multipurpose Internet Mail Extensions) provides a consistent way to send and receive secure MIME data. Based on the popular Internet MIME standard, S/MIME provides the following cryptographic security services for electronic messaging applications: authentication, message integrity and non-repudiation of origin (using digital signatures) and privacy and data security (using encryption)
Modern email clients, such as Outlook, Lotus Notes, Mail in OS X and Thunderbird seamlessly allow you to verify S/MIME signed email.
Be sure to add the CSU San Bernardino Root Certificate to your email client as a trusted authority for digital signatures (i.e. This certificate can identify mail users.)
OS X Leopard Antivirus
