Towards Making Luby-Rackoff Ciphers Optimal and Practical

Abstract

We provide new constructions for Luby-Rackoff block ciphers which are efficient in terms of computations and key material used. Next, we show that we can make some security guarantees for Luby-Rackoff block ciphers under much weaker and more practical assumptions about the underlying function; namely, that the underlying function is a secure Message Authentication Code. Finally, we provide a SHA-1 based example block cipher called Sha-zam

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