What is the Indifferentiability of Feistel Network?
Why is the concept of Indifferentiability useful and how it is applicable in the real world?
How is Indifferentiability compared to Indistinguishability?
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The definitions of "indistinguishability" and "indifferentiability" were introduced in paper "Indifferentiability, Impossibility Results on Reductions, and Applications to the Random Oracle Methodology". In my opinion, the concept of "indistinguishability" is related to distinguisher, like a differential or integral one. The definition of "indifferentiability" is shown in the image below.
I can not provide any insights since I haven't read the paper yet...