8.5 Email Security
Windows Mobile on your device protects your Outlook email through the Secure/Multipurpose Internet Mail Extension (S/MIME), which allows you to digitally sign and encrypt your messages.
Digitally signing a message applies your certificate with the authorization key to the message. This proves to the recipient that the message is from you and not from an imposter or a hacker, and that the message has not been altered.
Encryption protects the privacy of your message by converting it from plain, readable text into cipher (scrambled) text. Only a recipient who has the authorization key can decipher the message.
Notes:
S/MIME encryption and digital signatures for Windows Mobile devices are available only with Exchange Server 2003 SP2 or a later version that supports S/MIME. If you are not using one of these versions, or have not yet synchronized, these options are unavailable.
You can encrypt a message with or without a certificate. However, to read an encrypted message, you need a valid certificate to decrypt it.
To individually sign and encrypt a new message:
1.Tap Start > Programs > Messaging > Outlook E-mail.
2.Tap Menu > New to create a new message.
3.Tap Menu > Message Options.
4.From the Security list, select whether to encrypt only, sign the message only, or both.
5.Tap OK.
To verify the digital signature on a signed message you receive:
1.Open the Outlook email message that has been digitally signed.
2.At the top of the message, tap View Signature Status.
3.Tap Menu > Check Certificate. To view the details of the certificate in the message, tap Menu > View Certificate.
Notes
There can be several reasons why a digital signature is not valid. For example, the sender’s certificate may have expired, it may have been revoked by the certificate authority, or the server that verifies the certificate may be unavailable. Contact the sender to report the problem.
104 Section 8: Working With Company Email and Meeting Appointments
