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How many step function do Round 1 and 2 each have in S-AES?

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in Cryptograph & Network Security by (60.1k points)
How many step function do Round 1 and 2 each have in S-AES?

(a) 4 and 3

(b) Both 4

(c) 1 and 4

(d) 3 and 4

I have been asked this question by my school principal while I was bunking the class.

My doubt stems from The AES Algorthm in portion Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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The correct answer is (a) 4 and 3

The best I can explain: Round 1 has four step functions whereas Round 2 has three step functions.

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