Answer :
The US Department of Defense issues identification cards called Common Access Cards (CACs).
Military troops, civilian employees, and contractors frequently use it to access buildings, systems, and networks. A digital certificate for signing, a digital certificate for authentication, and a DoD-issued email certificate are among the certifications present in the CAC.
A key for authenticating and encrypting messages is also contained in it. To guarantee safe access to DoD systems and networks, all of these certificates are employed. To issue the required certificates, the DoD runs a variety of certificate authority.
These institutions include the DoD PKI Intermediate CA, DoD PKI Bridge CA, DoD PKI Root CA, and DoD PKI Issuing CA. These authorities issue certificates for a variety of purposes, such as user authentication, encryption, digital signing, and code signing.
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