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A. algorithm for performing encryption and decryption
A cipher is a systematic method used to encrypt or decrypt information. It transforms readable data, known as plaintext, into an unreadable format called ciphertext, and vice versa. The process involves the use of an algorithm and a key, ensuring that only intended recipients can decode the message. Ciphers can be classified into various types, such as substitution ciphers, which replace elements of the plaintext with other symbols, and transposition ciphers, which rearrange the order of the elements.