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Cisco Registered Envelope Service

Cisco Registered Envelope Serviceview expanded image

Traditional email is not truly secure or confidential

Despite the rise in text messaging, instant messaging, social networking, and other forms of communication, email continues to be the predominant business collaboration tool. The unsecured nature of email, however, has caused the inadvertent exposure of sensitive information to malicious attacks.

The Cisco Registered Envelope Service is Cisco's Email Encryption solution. It provides enhanced security and reliable controls for traditional email tools, and is fully integrated into the most common email technologies and into a user's daily email routine.

How CRES works

  1. Encryption triggered by policy or by DLP
  2. Cisco Email Security creates encryption key, wraps email in HTML envelope to the recipient
  3. When Envelope Storage is enabled, the key and the message is also stored temporarily in CRES
  4. Recipient opens clicks on the link to open the message on any device

Features and benefits

The three pillars of the solution are confidentiality, ease of use, and enhanced email controls.


Cisco Registered Envelope Service is based on robust technology that uses the most reliable email encryption algorithms available.

  • Two-step verification: The solution ensures that the intended recipient is registered and authenticated before reading the email.

Ease of use

Cisco Registered Envelope Service can provide strong encryption while making it easy to use.

  • No software or agents to install: Registered Envelopes deliver the encrypted payload to the end recipient that can be decrypted without the need for any software or applications installed on the endpoint.
  • Consistent user experience: The Easy Open feature provides a unified method for open secure messages on any device by temporarily storing the envelope.

Enhanced email controls

Cisco Registered Envelope Service gives senders full control to terminate or recall emails and know exactly when an email was opened.

  • Read receipt: When a recipient successfully authenticates and receives the encryption key to decrypt the message, the Registered Envelope Service delivers a read receipt to the sender in seconds.
  • Guaranteed message recall: By selecting the recall option, the key to decrypt the data expires and makes it impossible to access the message.
  • Message expiration: Set an expiration date before sending a message, at which time that message is terminated. After the expiration date, the information becomes inaccessible.
  • Control over responses: Forward, Reply, and Reply All can be selected or disabled only if your company authorizes it.


Registered Envelope Service enhances your email experience by providing read receipts, email recall, email expiration, and control over forward and reply capabilities in your favorite email client. Registered Envelope Service removes the complexity of encryption and key management, so you can send and receive highly secure messages as easily as unencrypted emails.

For more information

Evaluate how Registered Envelope Service could work for you with a Cisco sales representative, channel partner, or systems engineer today.

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