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Which of the following AES modes is used in the Intel DRNG? i) AES CFB ii) AES CTR iii) AES CBC iv) AEC OFB

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Which of the following AES modes is used in the Intel DRNG? i) AES CFB ii) AES CTR iii) AES CBC iv) AEC OFB

(a) 2nd and 3rd

(b) 3rd and 4th

(c) 1st and 2nd

(d) All of the mentioned

I had been asked this question in exam.

The doubt is from Pseudorandom Number Generators and Stream Ciphers topic in portion Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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Right answer is (a) 2nd and 3rd

Explanation: AES CTR and AES CBC are the 2 modes used in the INTEL DRNGs.

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