Answer:
The correct answer for the following question will be A. Cipher code.
Explanation:
Cipher code:
Ciphers are potentially the cryptographic central pillar. A cipher is usually an algorithm to perform both encryption and decryption.
Secret key encryption relies on the use of symmetric ciphers. Whether the goal is to convert plaintext to ciphertext and vice-versa. The secret key is shared on both ends, and the person having the secret key can only encrypt and decrypt the data.
So, option A is a suitable answer.