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Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?

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Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?

(a) 11101010

(b) 11011011

(c) 01101000

(d) 10101111

The question was posed to me in an internship interview.

Asked question is from The Simplified Data Encryption Standard (SDES) topic in chapter Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

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Right choice is (a) 11101010

To explain: The permuted key P10 = 0000101111. Input to P8: 0010011101 and K2 is 11101010.

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