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Implement two-round mBCJ multi-signature scheme #15

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burdges opened this Issue Feb 13, 2019 · 1 comment

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burdges commented Feb 13, 2019

We should implement the two round mBCJ signature scheme from pages 21 and 21 of https://eprint.iacr.org/2018/417.pdf using session type in the vein of the musig implementation in multi.rs

It requires a different verification from a schnorr signature, and comes with proofs-of-possession and a strange hierarchical relationship among the signers, but it does a two-round trip multi-signature without pairings.

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burdges commented Feb 22, 2019

I looked into mBCJ further. As written, it requires an aggregator check the proof-of-possession, but a malicious aggregator could simply ignore this, maybe permitting rogue public key attacks. I have not checked their security proof but it likely sweeps this under the rug with the key model. At some point @hndnklnc and I should look into a delinearized variant of mBCJ.

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