I can't find the answers of these questions....Thank you

A Digital signature is a piece of data digest encrypted with:

The public key of the key escrow.

The public key of the signer.

The private key of the signer.

The private key of the receiver.

The public key of the receiver.

The security administrator for Conglomerate.com has been been directed by the CIO to reduce the cost of certificates. Which of the following is the FIRST step that should be taken? Generate shared public and private keys.

Install a CA.

Install a RA

Establish a key escrow policy.