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Indistinguishability versus Indifferentiability

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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?

kodlu avatar
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define indifferentiability. not a standard term
SAI Peregrinus avatar
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At least not in cryptography. For functions in general it is, meaning the function has no derivative (over a region of interest). The Weirstrass Function is an early example of a continuous function that's indifferentiable over its entire domain (nowhere differentiable): it has no derivative. Fractal curves are generally "nowhere differentiable". None of that applies to anything commonly used in cryptography, and it's entirely unrelated to indistinguishability. Feistel Network functions are discrete, but using a difference quotient they do have a discrete derivative and so are differentiable.
Marc Ilunga avatar
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Indifferentiability is quite a standard term. And it's been used in many contexts for analyzing security of schemes.
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