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Data Encryption Standard is implemented using the Feistel Cipher which employs 16 round of Feistel structure.

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Data Encryption Standard is implemented using the Feistel Cipher which employs 16 round of Feistel structure.

(a) DES

(b) IDEA

(c) Caesar cipher

(d) Twofish

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My question comes from Cryptography in division Cryptography in Security of Cyber Security

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Correct choice is (a) DES

Explanation: Data Encryption Standard is a block cipher which implements the Feistel Cipher which employs 16 round of Feistel structure. The block size it uses is 64-bit.

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