Score:2

Why use different hash personalization for each level of Merkle tree?

vi flag

For example zcash uses such approach with Pederesen hash which is collision-resistant, but not preimage-resistant. I assume that it’s used to ensure that we can’t reuse hash from one level which collides with a hash from another.

Lev avatar
jp flag
Lev
Where did you read that the pedersen hash is not preimage resistant? It is hard to find the details in the zcash specifications but it seems plausibly preimage resistant.
Lev avatar
jp flag
Lev
You would need pre-image resistance in order to prove the hiding property of the merkle commitment.
Lev avatar
jp flag
Lev
Multi-dimensional discrete log's hardness should imply it is pre-image resistant.
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