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Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K1?

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Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K1?

(a) 00101111

(b) 01011011

(c) 01101000

(d) 10100111

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

My question comes from The Simplified Data Encryption Standard (SDES) topic in portion Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

1 Answer

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The correct answer is (a) 00101111

For explanation I would say: The permuted key P10 = 1000010111. Input to P8: 0000101111 and K1 is 00101111.

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