User Guide

19-2
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 19 S/MIME Security Services
S/MIME Security Services in Email Security Appliance
• Verify, decrypt, or decrypt and verify messages using S/MIME. See Verifying, Decrypting, or
Decrypting and Verifying Incoming Messages using S/MIME, page 19-14.
Related Topics
• Understanding How S/MIME Security Services Works, page 19-2
Understanding How S/MIME Security Services Works
• Scenario: Business-to-Business, page 19-2
• Scenario: Business-to-Consumer, page 19-3
Scenario: Business-to-Business
Organizations A and B want all the messages communicated between them to be signed and encrypted
using S/MIME. Organization A has configured Email Security appliance to perform S/MIME security
services at the gateway level. Organization B has configured a third-party application to perform
S/MIME security services at the gateway level.
Note The current example assumes that organization B is using a third-party application to perform S/MIME
security services. In the real world, this can be any application or appliance (including Email Security
appliance) that can perform S/MIME security services at the gateway level.
Organizat ionA
Organ iz at io nB
EmailClient
EmailSecurity Applia nce
Email Client
Gateway
Bob
Dave
Legend
Messagefrom
AtoB
Messagefrom
BtoA