Alice and Bob want to use a CA authentication procedure to authenticate each other. What must be obtained first?
- CA self-signed certificate
- Self-signed certificates of two CA authorities
- Self-signed certificate of the other device and the CA certificate
Explanation: In the CA authentication procedure, the first step when contacting the PKI is to obtain a copy of the public key of CA itself, called the self-signed certificate. The CA public key verifies all the certificates issued by the CA.
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