Answer (Choose 1 answer)
Which of the following best describes the role of the Feistel cipher in cryptography?
A. A symmetric structure that enables secure communication with smaller key lengths by splitting the plaintext
into two halves and processing them through multiple rounds of substitution and permutation
B. A method of encrypting data by converting plaintext into ciphertext using a public key and a private key
C. A technique that compresses data to reduce its size while retaining all original information for secure
transmission
D. A hash function that converts plaintext into a fixed-size string of characters, which is practically irreversible
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