Cascading Four Round LRW1 is Beyond Birthday Bound Secure

ePrint Report: Cascading Four Round LRW1 is Beyond Birthday Bound Secure

Nilanjan Datta, Shreya Dey, Avijit Dutta, Sougata Mondal

In CRYPTO'02, Liskov et al. have introduced a new symmetric key primitive called tweakable block cipher. They have proposed two constructions of designing a tweakable block cipher from block ciphers. The first proposed construction is called $\mathsf{LRW1}$ and the second proposed construction is called $\mathsf{LRW2}$. Although, $\mathsf{LRW2}$ has been extended in later works to provide beyond birthday bound security (e.g., cascaded …

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