(ISC)2 Certified in Cybersecurity Practice Exam

What is asymmetric encryption characterized by?

1. Using the same key for both encryption and decryption

2. Utilizing multiple encryption methods simultaneously

3. Employing one key for encryption and a different key for decryption

4. Focusing exclusively on data at rest encryption

The correct answer is: Employing one key for encryption and a different key for decryption

Asymmetric encryption is characterized by the use of two distinct keys: a public key used for encryption and a private key used for decryption. This method allows anyone to encrypt data using the public key, but only the holder of the corresponding private key can decrypt it. This key pair system enhances security, as the public key can be shared openly while the private key must be kept secret, ensuring that only authorized parties can access the encrypted information. The other options do not accurately represent the principles of asymmetric encryption. For instance, using the same key for both encryption and decryption describes symmetric encryption rather than asymmetric. Utilizing multiple encryption methods simultaneously relates more to cryptographic techniques such as hybrid encryption, which combines both asymmetric and symmetric methods, rather than the core principle of asymmetric encryption. Finally, focusing exclusively on data at rest encryption does not capture the essence of asymmetric encryption, as it can be applied to both data at rest and data in transit.