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4

The simple way to build authenticated encryption using a Feistel Network is to build a Feistel based block cipher, then use one of the many modes of operation that turn a block cipher into an authenticated encryption scheme (eg CCM,OCB,GCM). For a good survey on the subject of modes-of-operation I would recommend this paper by Rogaway. It does not cover the ...

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Yes, you certainly can. If you want a variable-length authenticated encryption mode, then simply take any Feistel cipher in the OCB mode. If fixed-length is fine, then the following idea should work. Build a wide Feistel-based permutation (fixed-key blockcipher) $G$ and encrypt $$C = G(P||N||K)\oplus K,$$ where $N$ is nonce, $P$ is plaintext, $C$ is ...

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Ff1,2,3 are basically inspired by LubyRack off constructions . At the core they differ in their round functions and key scheduling FF1 supports greater range of lengths and a tweak FF2 generates subkey for each iteration to thwart any side channel attacks FF3 has tweaks is split and used in rounding function, also the reverse the sub-strings of given ...

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Luby rackoff results are based on assuming the Round Function to be Secure Pseudo Random Functions. Where as the round functions of DES are not that secure enough which needs more rounds (Triple DES needs 48 rounds )

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