Which cipher replaces blocks of plaintext with ciphertext?

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Multiple Choice

Which cipher replaces blocks of plaintext with ciphertext?

Explanation:
Substitution ciphers replace plaintext units with ciphertext according to a fixed mapping. That matches the idea of taking a block of plaintext and substituting it for a corresponding ciphertext block. In contrast, transposition ciphers don’t replace symbols; they just rearrange the order of the same letters. The terms “ciphers” or “encryption” are too generic to specify the method: substitution is the one that describes actual replacement of blocks with new symbols.

Substitution ciphers replace plaintext units with ciphertext according to a fixed mapping. That matches the idea of taking a block of plaintext and substituting it for a corresponding ciphertext block. In contrast, transposition ciphers don’t replace symbols; they just rearrange the order of the same letters. The terms “ciphers” or “encryption” are too generic to specify the method: substitution is the one that describes actual replacement of blocks with new symbols.

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