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Interestingly, it seems there might have been independent invention of the same idea[0]. Have you checked for any patents in the space?

[0] https://bytes.grubhub.com/why-we-use-crypto-when-generating-...

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Thank you for the article. I was not aware of that article. My first implementation was done in 1997 or 1998. I am involve in computer security for three decades and I was familiar with Feistel networks. I am not a cryptographer but I have reverse engineered algorithms using this structure. Never checked patents because I think this is a natural construction and I always wondered why there were no other public ideas around this problem. This is not the first time it happened to me.

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