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IEEE Final Year Project Topics for CSE

Base Paper Title

Understanding the Related-Key Security of Feistel Ciphers from a Provable Perspective

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IEEE Project Abstract

We initiate the provable related-key security treatment for models of practical Feistel ciphers. In detail, we consider Feistel networks with four whitening keys wi(k), i = 0; 1; 2; 3,and round-functions of the form f(j(k)  X), where k is the master-key, wi and j are efficient transformations, and f is a public ideal function or permutation accessible by the adversary.We investigate key-schedule conditions that are sufficient for security against XOR-induced related-key attacks up to 2n=2 adversarial queries. When the key-schedules are non-linear, we prove security for 4 rounds. When only affine key-schedules are used, we prove security for 6 rounds. These also imply securet weakable Feistel ciphers in the Random Oracle model.By shuffling the key-schedules, our model unifies both theDES-like structure (known as Feistel-2 scheme in the cryptanalytic community, a.k.a. key-alternating Feistel due to Lampe and Seurin, FSE 2014) and the Lucifer-like model (previouslyanalyzed by Guo and Lin, TCC 2015). This allows us to deriveconcrete implications on these two (more common) models, and helps understanding their related-key security difference.

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