A block cipher is a cryptographic algorithm that operates on fixed-size blocks of data, transforming them into encrypted blocks. The block size is a fixed length, and common block sizes include 64 bits, 128 bits, or 256 bits. Each block is encrypted independently, and the same key is used for each block.
In contrast:
Hashing (Option B): Produces a fixed-size hash value regardless of the input size
So the question operate on specific length of data the answer is the block cipher
A. Block cipher
A block cipher is a method of encrypting text (to produce ciphertext) in which a cryptographic key and algorithm are applied to a block of data (for example, 64 contiguous bits) at once as a group rather than to one bit at a time. This is a cryptographic concept that operates on a fixed length of bits, which is called a block.
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