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I think this thread hook could be improved.
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I think this thread hook could be improved.
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In 2023, we realized a large class of Move dapps need access to *instant* randomness 🎲.
e.g., a simple call to, say, `randomness::u8_integer()` should *instantly* return a random byte to the caller.
DevX is very important to us, so the *instant* part was 🔑.
Having worked on threshold crypto[graphy] before, @SashaSpiegelman, @XiangZhuolun, @bennypinkas and I were well-aware of the implementation complexities & inefficiencies of DKGs and VUFs, especially in the PoS/weighted setting.
This would be a fun challenge!
We suspected that PVSS-based aggregatable DKGs would be the cleanest to implement in the @aptos BFT protocol & should be efficient too.
The state-of-the-art was our EUROCRYPT'21 paper with @kobigurk, @Daeinar, Mary Maller, Sarah Meiklejohn & @Giladstern_: eprint.iacr.org/2021/005.pdf
Yet, the SCRAPE PVSS from EUROCRYPT'21 was slow-to-verify (high # of pairings).
In particular, for ~1000 (virtual) parties in the PoS/weighted setting, the verification time would have been 5.2 secs.
CPU cycles not spent on TXN execution = bad.
We needed something better... 🤔
To address this, @sourav1547 designed a faster, weighted, aggregatable PVSS, with a much smaller # of pairings 🧠.
Verification time was lowered by around 20x!
We were in business! 👊
Another challenge: the naively-weighted variant of the EUROCRYPT'21 VUF had share size *linear* in the weight (stake) of each player (validator) and was rather complex (e.g., Groth-Sahai proofs).
But @bennypinkas designed a simpler and more efficient weighted VUF, which had constant-share size, independent of the player's weight 🤯!
Since a weighted VUF is aggregated every block, the lower communication & faster aggregation of this new VUF was crucial for performance!
In reality, the road was much more winding & complicated 😄...
For example, we reinvented the ALBATROSS PVSS without realizing (eprint.iacr.org/2020/644) just to find out that making it aggregatable, although possible, would require two rounds of dealing.
The idea💡 was the 1st stage.
In the next 🧵, I'll discuss *the academic paper* and the gaps that had to be filled there!
Stay tuned 📡 !