True or False: To encrypt an e-mail using PKI, you are required to have a Common Access Card (CAC).

The statement is considered true because encrypting an email using Public Key Infrastructure (PKI) often involves the use of a Common Access Card (CAC). The CAC serves as a secure means of authentication and contains a digital certificate, which is necessary for encrypting and signing emails securely. This is particularly relevant in a military or government context where secure communications are mandated, making the CAC a vital tool for personnel to verify identities and ensure that the encryption methods used comply with established protocols.

While it is technically possible to encrypt emails without a CAC by using other means of obtaining cryptographic keys, in many standardized environments, especially within the Department of Defense and related organizations, the CAC is typically required for access to secure email systems. This reinforces the statement's accuracy concerning the standard procedures for encrypting sensitive communications in such contexts.