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I know that all the subkeys $k_i$ are derived from the main key $K$, but how? However the cipher designer feel like. The Feistel design gives guidance as to how the block is processed (and in a way to make inverting the cipher easy), however it gives no guidance as to actually generate the subkeys. The designers can do anything they like, and still ...


First of all, you don't include a key; I'll assume that the sbox is the key. However, even with that assumption, it still doesn't meet the general expected requirements for a block cipher. In the decrypt direction, any one byte of the decrypted result depends only on 16 (!) bytes of the ciphertext block. This can be seen by considering the inverse of the ...

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