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Combining transposition cipher with substitution cipher improves its strength?

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Combining transposition cipher with substitution cipher improves its strength?

(a) true

(b) false

I have been asked this question in an online quiz.

I need to ask this question from Cryptography topic in portion Cryptography of Data Structures & Algorithms II

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Right answer is (a) true

For explanation: Combining transposition cipher with substitution cipher helps in overcoming its weaknesses. But it causes the cipher to become more laborious to decode and it becomes more prone to errors.

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