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Which RC5 mode will have the ciphertext longer than the plaintext by at most the size of a single RC5 block?

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Which RC5 mode will have the ciphertext longer than the plaintext by at most the size of a single RC5 block?

(a) RC5 block cipher

(b) RC5-Cipher Block Chaining

(c) RC5-Cipher Block Chaining Pad

(d) RC5-CipherText Stealing

The question was asked in my homework.

This is a very interesting question from RC4 and RC5 topic in portion Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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Best answer
The correct choice is (c) RC5-Cipher Block Chaining Pad

Easiest explanation: The Cipher Block Chaining Pad mode produces a ciphertext output as such.

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