Cisco Cisco Email Security Appliance C170 Guia Do Utilizador
20-3
User Guide for AsyncOS 9.8 for Cisco Email Security Appliances
Chapter 20 S/MIME Security Services
S/MIME Security Services in Email Security Appliance
Organization A sending a message to Organization B:
1.
Bob (Organization A) uses an email client to send an unsigned and unencrypted message to Dave
(Organization B).
(Organization B).
2.
Email Security appliance in the Organization A signs and encrypts the messages and sends it to
Organization B.
Organization B.
3.
The third-party application at the gateway of Organization B decrypts and verifies the message.
4.
Dave receives an unencrypted and unsigned message.
Organization B sending a message to Organization A:
1.
Dave (Organization B) uses an email client to send an unsigned and unencrypted message to Bob
(Organization A).
(Organization A).
2.
The third-party application at the gateway of Organization B signs and encrypts the message and
sends it to Organization A.
sends it to Organization A.
3.
Email Security appliance in the Organization A decrypts and verifies the message.
4.
Bob receives an unencrypted and unsigned message.
Scenario: Business-to-Consumer
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 the email clients of all the users to perform
S/MIME security services.
using S/MIME. Organization A has configured Email Security appliance to perform S/MIME security
services at the gateway level. Organization B has configured the email clients of all the users to perform
S/MIME security services.
Organization B
Organization A
Email Client
Email Security Appliance
Email Client
Gateway
Alice
Erin
Legend
Message from
A to B
Message from
B to A