Cisco Cisco Email Security Appliance C370 Weißbuch
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4
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
a Cisco Email Security Appliance (one of the Cisco Email Security
deployment options) to perform S/MIME security services at the
gateway level. Organization B has a third-party application to perform
S/MIME security services at the gateway level.
Organization A
Organization B
Email Security Appliance
Email Client
Bob
Email Client
Legend
Message from
A to B
Message from
B to A
Gateway
Dave
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 Cisco Email Security Appliance) that can
perform S/MIME security services at the gateway level.
Organization A sending a message to Organization B:
1. Bob (Organization A) uses an email client to send an unsigned and
1. Bob (Organization A) uses an email client to send an unsigned and
unencrypted message to Dave (Organization B).
2. Cisco Email Security Appliance (ESA) in Organization A signs and
encrypts the messages and sends it to 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
1. Dave (Organization B) uses an email client to send an unsigned and
unencrypted message to Bob (Organization A).
2. The third-party application at the gateway of Organization B signs
and encrypts the message and sends it to Organization A.
3. Cisco Email Security Appliance in 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
Cisco 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 A
Organization B
Email Security Appliance
Email Client
Alice
Email Client
Legend
Message from
A to B
Message from
B to A
Gateway
Erin
Cisco Email Security How-To Guide
How-To Secure Communications
Cisco Public