Cisco Cisco Email Security Appliance C170 사용자 가이드

A signing key is the private key stored on the Cisco IronPort appliance. When creating a signing key, 
you specify a key size. Larger key sizes are more secure; however, larger keys also can impact 
performance. The Cisco IronPort appliance supports keys from 512 bits up to 2048 bits. The 768 - 1024 
bit key sizes are considered secure and used by most senders today. Keys based on larger key sizes can 
impact performance and are not supported above 2048 bits. For more information about creating signing 
keys, see 

If you are entering an existing key, simply paste it into the form. Another way to use existing signing 
keys is to import the key as a text file. For more information about adding existing signing keys, see 

.

Once a key is entered, it is available for use in domain profiles, and will appear in the Signing Key list 
in the domain profile:

You can export your signing keys to a text file on the Cisco IronPort appliance. When you export keys, 
all of the keys currently existing on the appliance are put into a text file. For more information about 
exporting keys, see 

You can import keys that have been exported as well.

Importing keys causes all of the current keys on the appliance to be replaced. 

For more information, see 

.