How can I prevent a recipient from reading a secure, CRES-encrypted message I have sent?

Through the Cisco Registered Envelope Service (CRES), you can lock or unlock, and expire or unexpire encrypted messages; you can also check the read status of a sent message. To do these tasks, you must first register your Indiana University email address with CRES; once your IU address is registered, you can then manage all encrypted sent messages, even messages sent before registration.

Note:
Locking or expiring messages must be done in a timely manner to have the best chance of preventing inadvertent access to sensitive data. If the message has already been read, copied, or forwarded, you will not be able to use CRES tools to protect that information. If you believe that sensitive data has been wrongly disclosed, contact it-incident@iu.edu; see At IU, how do I report a suspected information or information technology (IT) security issue?

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Registering your IU email address

See How can I register my IU Exchange email account with CRES?

Locking an encrypted message

If you want to prevent the recipient of a secure message from being able to decrypt the envelope and read the contents (e.g., if you sent it to the wrong recipient), you can lock the message.

  1. Log into https://res.cisco.com/.
  2. Click Manage Messages in the left menu.
  3. In the "Keyword" box, enter some search terms to find the message, and then click Search.
  4. Locate your message in the results, and then click the subject of the message.
  5. On the "Update Sent Message" page, next to "Locked", click either the lock icon or No.
  6. In the pop-up window, provide a reason for locking the message, if you want. This text will be displayed to the recipient on attempting to decrypt the message.
  7. Click Update to close the pop-up window.
  8. Click Save.

Expiring an encrypted message

You can set an encrypted message to expire on a specific date. Once that date arrives, the recipient will no longer be able to decrypt the message and read the contents; the recipient will see the text "Message expired. Contact sender to reactivate."

This process can be reversed.

  1. Log into https://res.cisco.com/.
  2. Click Manage Messages in the left menu.
  3. In the "Keyword" box, enter some search terms to find the message, and then click Search.
  4. Locate your message in the results, and then click the subject of the message.
  5. Click the calendar icon, or manually fill in an expiration date.
  6. Click Save.

Unexpiring an encrypted message

To remove an expiration date:

  1. Log into https://res.cisco.com/.
  2. Click Manage Messages in the left menu.
  3. In the "Keyword" box, enter some search terms to find the message, and then click Search.
  4. Locate your message in the results, and then click the subject of the message.
  5. Clear the expiration date field.
  6. Click Save.

This is document bbun in the Knowledge Base.
Last modified on 2015-07-16 00:00:00.

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