What is the funniest number in cryptography? 0. The reason is that for all x,
x*0 = 0, i.e., the equation is always satisfied no matter what x is. This
article discusses crypto bugs in four BLS signatures’ libraries (ethereum/py
ecc, supranational/blst, herumi/bls, sigp/milagro bls) that revolve around 0.
Furthermore, we develop “splitting zero” attacks to show a weakness in the
proof-of-possession aggregate signature scheme standardized in BLS RFC draft
v4. Eth2 bug bounties program generously awarded $35,000 in total for the
reported bugs.

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