Blackberry 8800 - SMARTPHONE - SAFETY AND Suplemento ao Manual do Utilizador - Página 19

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S/MIME-protected messages

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 address book. Your device uses the

email address in your address book 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.

Attach a certificate to a message

You can attach a certificate to email messages and PIN messages.

1. When composing a message, press the Menu key.

2. Click Attach Certificates.

3. Highlight a certificate.

4. Press the Menu key.

5. Click Continue.

Download the certificate used to sign or encrypt a message

If a certificate is not included in a received message or is not already stored in the key store on your BlackBerry® device, you can download

the certificate.

1. In a message, highlight the encryption indicator or a digital signature indicator.

2. Press the Menu key.

3. Click Fetch Sender's Certificate.