S/Mime-Protected Messages - Blackberry Curve 8350i User Manual

User Guide

S/MIME-protected messages

S/MIME-protected message basics
About signing and encrypting messages
You can digitally sign or encrypt messages to add another level of security to email messages and PIN messages that you send from your
BlackBerry® device. Digital signatures are designed to help recipients verify the authenticity and integrity of messages that you send.
When you digitally sign a message using your private key, recipients use your public key to verify that the message is from you and that
the message has not been changed.
Encryption is designed to keep messages confidential. When you encrypt a message, your device uses the recipient's public key to encrypt
the message. Recipients use their private key to decrypt the message.
To send an encrypted PIN message, you must have a PIN and an email address for the contact in your contact list. Your device uses the
email address in your contact list to locate a PGP® key or certificate for the contact.
Sign or encrypt a message
You can sign or encrypt email messages and PIN messages.
1. When composing a message, change the Encoding field.
2. If necessary, change the Classification field.
Encrypt a message with a pass phrase
Your BlackBerry® device can encrypt email messages and PIN messages using a pass phrase shared between the sender and recipient.
1. In an unsent message, set the Encoding field to Encrypt or Sign and Encrypt.
2. Press the Menu key.
3. Click Options.
4. Set the Use Password-Based Encryption field to Yes.
5. In the Allowed Content Ciphers section, select the check box beside one or more allowed content ciphers.
6. If you are signing the message, in the Signing Options section, select a certificate.
7. Press the Menu key.
8. Click Save.
9. Type your message.
10. Press the Menu key.
11. Click Send.
12. Type a pass phrase to encrypt the message.
13. Confirm the pass phrase.
14. Click OK.
Using a secure method, let the recipient know what the pass phrase is.
S/MIME-protected messages
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