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What is the size of the key in the SDES algorithm?

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What is the size of the key in the SDES algorithm?

(a) 24 bits

(b) 16 bits

(c) 20 bits

(d) 10 bits

This question was posed to me in an online interview.

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

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Correct option is (d) 10 bits

For explanation I would say: The size of the key in the SDES algorithm is 10 bits.

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