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While googling I could find only feistel ciphers and didn’t find any relevant information on non-feistel ciphers. Can someone suggest me some good non-feistel ciphers?
And yes this is homework.
There’s way more than Feistel ciphers. 🙂
The simple answers: No stream ciphers, such as rc4, are Feistel ciphers. No Public Key ciphers, such as RSA or El Gamal are Feistel ciphers.
And the perhaps-surprising counter-example: Rijndael (the new AES), despite being a block cipher, isn’t Feistel.
If you’re really interested in Cryptography, I strongly recommend reading Handbook of Applied Cryptography, freely available and significantly better than most undergraduate texts. Schneier’s “Applied Cryptography” is decent enough, an excellent introduction, but doesn’t get into as much detail as one might like.