CMMC Practice Requirement:

Protect the authenticity of communications sessions.

CMMC Requirement Explanation:

This requirement addresses communications protection at the session level. The requirement intends to protect against man-in-the-middle-attacks.

Example CMMC Implementation:

Configure TLS on your web servers and VPN connections. Use digital certificates on your web servers and keep them updated. Any web interface you log into should have green lock in the address bar (TLS with valid certificate). When users authenticate to a web service or other service over the network they should use two factor authentication.

Scenario(s):

- Scenario 1:

You have a time sheet server on your local network. When users access the login page they notice the URL of the server includes HTTPS, meaning that is protected by TLS. It also has a green lock in the URL bar indicating that it has a valid certificate. Both of these security controls protect the authenticity of the users connection to the time sheet server. When the user logs into the time sheet they log in using two factor authentication.
 

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