wnfs-wg / rs-skip-ratchet Goto Github PK
View Code? Open in Web Editor NEWRust implementation of the skip ratchet
Home Page: https://eprint.iacr.org/2022/1078
License: Apache License 2.0
Rust implementation of the skip ratchet
Home Page: https://eprint.iacr.org/2022/1078
License: Apache License 2.0
As discussed. I'm leaving this issue here as a reference point.
To simplify dependency tracking for rs-wnfs, it'd be nice to have this library published on crates.io
Interesting DSs
Apologies for the late-game addition! I did a revision pass before publishing the skip ratchet paper. The major change is that while XOR is probably fine for a lot of use cases, its nice algebraic properties have some leaky edge cases that are sometimes hard to spot in the moment. The binary inverse also has some potential for leaking if the hash is later weakened, and a concatenated salt is likely better.
TL;DR using salted hashes is probably safer in some situations. This basically comes down to any operations that used to use a binary inverse or XOR now use a salted hash.
hash(inverse(parent))
hash(salt <> parent)
xor(big, xor(med, small))
hash(big ⋈ med ⋈ small)
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