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74 Working With Company E-mail and Meeting Appointments
8.5 E-mail Security
Windows Mobile protects your Outlook e-mails through 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 the recipient who has the authorization key can decipher the message.
Requirement
S/MIME encryption and digital signatures for Windows Mobile-based devices are available only with
Exchange Server 2003 SP2 or a later version
that supports S/MIME. If your company is not using
one of these products, or you have not completed your first synchronization with the Exchange
Server, these options are unavailable.
Note
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 do both.
5.
Tap
OK
.
To verify the digital signature on a signed message you receive
1.
Open the Outlook e-mail 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
.
Note
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have expired, it may have been revoked by the certificate authority, or the server that verifies the certificate is
unavailable. Contact the sender to report the problem.
To digitally sign and encrypt all messages
You can set up ActiveSync to digitally sign and encrypt all outgoing messages. You must obtain a valid
certificate to sign and encrypt e-mail messages successfully.
1.
Tap
Start > Programs > ActiveSync
.
2.
Tap
Menu > Options
.
3.
Select the
E-mail
information type, and tap
Settings
. On the E-mail Sync Options screen, tap
Advanced
.