Cisco Cisco Web Security Appliance S170 사용자 가이드

Identities serve these purposes:

Group transaction requests for the application of policies.

Specify identification or authentication needs for members of the identify group.

AsyncOS assigns an identity to every transaction it processes. A global identity applies to all 
transactions that do not qualify for membership in a user-defined identity. The identities you create are 
also available for use in configuring access policies (including SOCKS policies) and decryption policies.