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What is the number of round computation steps in the SHA-256 algorithm?

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What is the number of round computation steps in the SHA-256 algorithm?

(a) 80

(b) 76

(c) 64

(d) 70

This question was posed to me by my school teacher while I was bunking the class.

Question is taken from Secure Hash Algorithms (SHA) in portion Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

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Correct answer is (c) 64

Easiest explanation: The number of round computation steps in the SHA-256 algorithm is 64.

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