The network administrator for a company is setting up a website with e-commerce capabilities. Packet sniffing is a concern because credit card information will be sent electronically over the Internet

Asymmetric cryptography relies on a mathematically linked public/private key pair; the SSL/TLS certificate contains the server's public key, which the client uses to encrypt the pre-master secret during the TLS handshake, and the server uses its private key to decrypt it. This mechanism secures the session establishment and protects sensitive e-commerce data such as credit card numbers transmitted over HTTPS.

'Confidential' is not a recognized certificate type or cryptographic classification in any PKI, SSL/TLS, or security standard.

Symmetric cryptography uses a single shared key for both encryption and decryption and is used for bulk data transfer after the TLS handshake is complete - it is not the certificate type that enables HTTPS encryption.

'Non-confidential' is not a defined certificate or cryptographic classification in any PKI framework or industry standard.