Microsoft Azure Architect Technologies (AZ-300) Practice Exam

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Which encryption type is specifically employed for TLS in HTTPS?

Symmetric encryption
Asymmetric encryption
Block encryption
Stream encryption

The correct answer is: Asymmetric encryption

The correct choice associated with TLS in HTTPS is asymmetric encryption, which plays a crucial role in establishing secure connections. Asymmetric encryption uses a pair of keys: a public key for encryption and a private key for decryption. This method is particularly advantageous during the initial handshake process in TLS, where the client and server exchange keys securely. During this process, the client uses the server's public key to encrypt a randomly generated session key, which is sent to the server. Only the server, with its corresponding private key, can decrypt this session key. Once both parties have the session key, they can use symmetric encryption for the actual data transfer. This combination allows for secure authentication, establishing a secure channel for communication while maintaining the integrity and confidentiality of data. While block and stream encryption refer to modes of operation for cryptographic algorithms, they are not the primary focus when identifying the unique encryption type employed specifically for the TLS protocol in HTTPS. Symmetric encryption is used afterward for efficient data transmission, but the initial security credentials are established through asymmetric encryption.