Which cryptographic method enhances security through the use of dual keys?

• A. Hashing
• B. Symmetric cryptography
• C. Asymmetric cryptography
• D. Encoding

Answer: (C)

The correct answer focuses on asymmetric cryptography, which enhances security through the use of dual keys, commonly referred to as a public key and a private key. In this cryptographic method, the public key is used for encryption, while the private key is required for decryption. This dual-key system means that even if someone has access to the public key, they cannot decrypt the information without the corresponding private key, which is kept secret.

This method provides enhanced security since the keys are not the same, unlike in symmetric cryptography, where a single key is used for both encryption and decryption. Asymmetric cryptography is fundamental for secure communications over the internet, such as in SSL/TLS protocols used for secure websites, enabling secure exchanges without needing to share a secret key in advance.