What form of encryption ensures secure communication between client and server?

• A. TLS
• B. AES 256
• C. RSA 2048
• D. Blowfish 56 bit

Answer: (B)

The correct answer is TLS, which stands for Transport Layer Security. TLS is a cryptographic protocol designed to provide secure communication over a computer network. It is commonly used to secure connections between web servers and clients, such as browsers, ensuring that data transmitted between them is encrypted and protected from eavesdropping, tampering, and forgery.

TLS establishes a secure session by using a combination of asymmetric and symmetric encryption. Initially, it uses asymmetric encryption for the handshake process, during which the client and server authenticate each other and negotiate a shared secret key. After this, symmetric encryption (such as AES) is typically used to encrypt the actual data being transmitted, making it efficient for ongoing communication.

While AES 256 is a strong encryption algorithm and can be used for securing data, it does not, by itself, establish a communication protocol between client and server. Similarly, RSA 2048 and Blowfish 56 bit refer to encryption algorithms, but they are not protocols designed specifically for secure communication sessions. RSA is primarily used for secure key exchange, and Blowfish, while a secure cipher, is not commonly used in modern secure communications compared to more up-to-date algorithms like AES within TLS.