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Indifferentiability of the Sponge Construction with a Restricted Number of Message Blocks
Feb. 20, 2023, 4:24 p.m. |
IACR News www.iacr.org
ePrint Report: Indifferentiability of the Sponge Construction with a Restricted Number of Message Blocks
Charlotte Lefevre
The sponge construction is a popular method for hashing. Quickly after its introduction, the sponge was proven to be tightly indifferentiable from a random oracle up to $ \approx 2^{c/2}$ queries, where $c$ is the capacity. However, this bound is not tight when the number of message blocks absorbed is restricted to $\ell <\lceil \frac{c}{2(b-c)}\rceil + 1$ (but still an arbitrary number of blocks …
construction eprint report hashing introduction message oracle popular quickly random report restricted
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