What is a cipher primarily used for?

A cipher is primarily used for encryption or decryption, which means it transforms plaintext data into ciphertext to protect the information during transmission and storage. This process ensures that only authorized individuals who possess the appropriate key can decode the ciphertext back into readable plaintext.

The purpose of using a cipher is to maintain confidentiality, integrity, and security of sensitive information, especially in communication or data storage contexts. Ciphers are fundamental to many cybersecurity practices, including secure messaging protocols, encryption of files, and even securing data in databases to prevent unauthorized access.

While data storage, transmitting messages, and database management may involve the use of ciphers as part of broader processes, their central function is in the encryption and decryption of information, making option B the most accurate representation of a cipher’s primary use.