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Implement two-round mBCJ multi-signature scheme #15

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 using session type in the vein of the musig implementation in

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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