Which description applies to symmetric key encryption?

Which description applies to symmetric key encryption?

• A. Two keys are used to encrypt and decrypt data
• B. Is unbreakable
• C. Same key for encryption and decryption
• D. Uses public and private keys

Answer: (C)

Symmetric key encryption relies on a single shared secret for both turning plaintext into ciphertext and back again. This means the same key is used to encrypt and decrypt, which makes the process fast and efficient for large amounts of data. The crucial point is that the key must be kept secret and securely distributed to the intended recipient; if the key is compromised, both encryption and decryption are exposed. It isn’t described as unbreakable—security depends on the key length and algorithm, as well as how well the key is protected. It also isn’t about using two different keys or a public/private key pair, which are features of asymmetric cryptography. So the description that fits is: the same key for encryption and decryption.

Symmetric key encryption relies on a single shared secret for both turning plaintext into ciphertext and back again. This means the same key is used to encrypt and decrypt, which makes the process fast and efficient for large amounts of data. The crucial point is that the key must be kept secret and securely distributed to the intended recipient; if the key is compromised, both encryption and decryption are exposed. It isn’t described as unbreakable—security depends on the key length and algorithm, as well as how well the key is protected. It also isn’t about using two different keys or a public/private key pair, which are features of asymmetric cryptography. So the description that fits is: the same key for encryption and decryption.