Question:

What must the CAs for both companies establish to accomplish in the case:
Two different organizations have their own public key infrastructure up and running. When the two companies merged, security personnel wanted both PKIs to validate certificates from each other.

A Cross-certification

explanation

When PKIs need to communicate with one another and trust certificates from both sides, CAs must establish a mutual trust known as cross-certification.

What must the CAs for both companies establish to accomplish in the case: Two different organizations have their own public key infrastructure up and running. When the two companies merged, security personnel wanted both PKIs to validate certificates from each other.

Related Information

What must the CAs for both companies establish to accomplish in the case:
Two different organizations have their own public key infrastructure up and running. When the two companies merged, security personnel wanted both PKIs to validate certificates from each other.