Cisco Cisco Email Security Appliance C190 User Guide
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Cisco AsyncOS 8.0.2 for Email User Guide
Chapter 16 Cisco Email Encryption
Encrypting Messages using the Email Security Appliance
•
Medium Security. The recipient does not need to enter credentials to open the encrypted message
if the recipient credentials are cached.
if the recipient credentials are cached.
•
No Password Required. This is the lowest level of encrypted message security. The recipient does
not need to enter a password to open the encrypted message. You can still enable the read receipts,
Secure Reply All, and Secure Message Forwarding features for envelopes that are not
password-protected.
not need to enter a password to open the encrypted message. You can still enable the read receipts,
Secure Reply All, and Secure Message Forwarding features for envelopes that are not
password-protected.
Step 9
To enable users to open your organization’s URL by clicking its logo, you can add a link to the logo.
Choose from the following options:
Choose from the following options:
•
No link. A live link is not added to the message envelope.
•
Custom link URL. Enter the URL to add a live link to the message envelope.
Step 10
Optionally, enable read receipts. If you enable this option, the sender receives a receipt when recipients
open the secure envelope.
open the secure envelope.
Step 11
Optionally, click Advanced under Envelope Settings to configure the following settings:
•
Enter the length of time (in seconds) that a message can be in the encryption queue before timing
out. Once a message times out, the appliance bounces the message and sends a notification to the
sender.
out. Once a message times out, the appliance bounces the message and sends a notification to the
sender.
•
Select an encryption algorithm:
–
ARC4. ARC4 is the most common choice, providing strong encryption with minimal
decryption delays for message recipients.
decryption delays for message recipients.
–
AES. AES provides stronger encryption but also takes longer to decrypt, introducing delays for
recipients. AES is typically used in government and banking applications.
recipients. AES is typically used in government and banking applications.
•
Enable or disable the decryption applet. Enabling this option causes the message attachment to be
opened in the browser environment. Disabling this option causes message attachments to be
decrypted at the key server. If you disable this option, messages may take longer to open, but are not
dependent on the browser environment.
opened in the browser environment. Disabling this option causes message attachments to be
decrypted at the key server. If you disable this option, messages may take longer to open, but are not
dependent on the browser environment.
Step 12
In the Message Settings section, enable or disable Secure Reply All.
Step 13
Enable or disable Secure Message Forwarding.
Step 14
Select an HTML notification template. Choose from HTML notifications you configured in text
resources. If you did not configure a template, the system uses the default template.
resources. If you did not configure a template, the system uses the default template.
Note
The key server uses an HTML or text notification based on the recipient’s email application. You
must configure notifications for both.
must configure notifications for both.
Step 15
Select a text notification template. Choose from text notifications you configured in text resources. If
you did not configure a template, the system uses the default template.
you did not configure a template, the system uses the default template.
Step 16
Enter a subject header for encryption failure notifications. The appliance sends a notification if the
encryption process times out.
encryption process times out.
Step 17
Select an encryption failure notification template for the message body. Choose from an encryption
failure notification template you configured in text resources. If you did not configure a template, the
system uses the default template.
failure notification template you configured in text resources. If you did not configure a template, the
system uses the default template.
Step 18
Submit and commit your changes.