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Which mode is less prone to decryption : PRNG using CTR / PRNG using OFB?

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Which mode is less prone to decryption : PRNG using CTR / PRNG using OFB?

(a) OFB

(b) CTR

(c) Both are equally prone

(d) Both can’t be decrypted

This question was addressed to me in semester exam.

This interesting question is from Pseudorandom Number Generators and Stream Ciphers topic in chapter Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

1 Answer

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Best answer
Correct choice is (b) CTR

The explanation is: CTR mode is more prone than the OBF mode.

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