Web2n is insecure: Gen outputs a uniform k 2f0;1gn. To authenticate a message m 1jjm 2 with jm 1j= jm 2j= n, compute the tag F k(m 1)jjF k(F k(m 2)). Practice Problems Question 1 For any function g : f0;1gn!f0;1gn, de ne g$() to be a probabilistic oracle that, on input 1n, chooses uniform r 2f0;1gn and returns hr;g(r)i. A keyed function F is a WebDefinition (k-ERF): An adaptive k-ERF is a function where, for a random input , when a computationally unbounded adversary can adaptively read all of except for bits, for some negligible function . The goal is to construct adaptive ERF's when trying to extract output that is indistinguishable to uniform.
Differentially uniform mappings for cryptography
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What is a cryptographic cipher? - SearchSecurity
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