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The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key

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The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key

(a) 12

(b) 18

(c) 9

(d) 16

This question was addressed to me during a job interview.

My enquiry is from The Data Encryption Standard (DES) and It’s Strength topic in division Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

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The correct option is (d) 16

To explain: The DES Algorithm Cipher System consists of 16 rounds (iterations) each with a round key.

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