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Which mode requires the implementation of only the encryption algorithm?

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Which mode requires the implementation of only the encryption algorithm?

(a) ECB

(b) CBC

(c) CTR

(d) OFB

I had been asked this question in an interview for internship.

My query is from DES Modes of Operation in division Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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Best answer
The correct choice is (c) CTR

The explanation: The CTR mode only requires the implementation of either the encryption or decryption phase. Both the phases are somewhat similar.

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