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Which of the following encryption algorithms is based on the Feistal structure?

2. RSA public key cryptographic algorithm
3. Data Encryption standard
4. RC4
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Feistal cipher is a symmetric cipher used in the construction of block cipher.

RSA is an asymmetric crypto mechanism.

DEC is symmetric and based on Feistal cipher

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

by Veteran (431k points) 1 flag:
✌ Edit necessary (logan1x “DES instead of DEC.”)
+2
*Correction - DES instead of DEC
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So $\mathbf C$ is the correct answer?
Feistel structure is symmetric key cryptography

DES and RC4 both are symmetric cryptography

by Veteran (119k points)
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why not AES @srestha
+1
You are arguing like:

I like ice cream.
He likes ice-cream.

So, I'm him.
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Sir I'm not much good with this subject but my doubt is DES and AES both are symmetric algorithms then why only DES is considered as fiestel structure
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ALL symmetric algorithms are not based on feistal structure.
@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 .
by Loyal (9.9k points)
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MMost symmetric block ciphers are based on a Feistel Cipher Structure
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Oh yes i will see :)