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Which one of the following is not a RC5 mode of operation?

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Which one of the following is not a RC5 mode of operation?

(a) RC5 block cipher

(b) RC5-Cipher Block Chaining

(c) RC5-Cipher Padding

(d) RC5-CipherText Stealing

This question was posed to me during an internship interview.

Query is from Overview topic in portion Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

1 Answer

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Best answer
Correct answer is (c) RC5-Cipher Padding

The explanation: RFC 2040 [BALD96] defines four different modes of operation:

1. RC5 block cipher

2. RC5-CBC

3. RC5-CBC-Pad

4. RC5-CTS.

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