A security administrator at a Lab Company is required to implement a solution which will provide the highest level of confidentiality possible to all data on the lab network.
The current infrastructure design includes:
Two-factor token and biometric based authentication for all users

Attributable administrator accounts

Logging of all transactions

Full disk encryption of all HDDs

Finely granular access controls to all resources

Full virtualization of all servers

The use of LUN masking to segregate SAN data

Port security on all switches

The network is protected with a firewall implementing ACLs, a NIPS device, and secured wireless access points.
Which of the following cryptographic improvements should be made to the current architecture to achieve the stated goals?