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3 Answers

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Feistal cipher is a symmetric cipher used in the construction of block cipher.

RSA is an asymmetric crypto mechanism.

DES is symmetric and based on Feistal cipher

RC4 is a stream cipher which makes it symmetric, but is not based on Feistal structure.

Correct Answer: C

edited by
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Feistel structure is symmetric key cryptography

DES and RC4 both are symmetric cryptography

So, Answer C) and D)
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@srestha

Fiestal structure are block cipher . Not a symmetric Cyrptogaraphy

A symmetric is one which use same key for Encryption and Decryption

Infact it should be DES AES and tripple DES as block cipher ( or fiestal ) They amke use of P and S boxes .
Answer:

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