sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja
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<RubenSomsen> waxwing: maybe you're thinking of the Java implementation of Bulletproofs for Monero where generator H was hash(G)*G
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<sipa> RubenSomsen: wut?
<RubenSomsen> sipa: from the audit a while back "Dependent Generators in original java version of Bulletproofs are not secure. The code had to be revised to improve number generation." https://ostif.org/the-ostif-and-quarkslab-audit-of-monero-bulletproofs-is-complete-critical-bug-patched/
<gmaxwell> oh man thats like backdoor grade bad. :(
<RubenSomsen> Their final implementation wasn't in Java and didn't have the bug, but yeah.
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<sarang> That was prototyping code using an older library for algorithm testing only
<gmaxwell> sarang: how'd that behavior happen?
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<booyah> generator H? as in, EC generator/base point?
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<gmaxwell> booyah: yes
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<sarang> gmaxwell: IIRC the underlying Java library function did a hash and a simple G-multiplication
<sarang> This behavior was only present in that particular library that was used to test correctness of the BP algorithms
<sarang> We considered the library to be out of scope for the audit for this reason, but the reviewers did a very thorough job
<sarang> and FWIW we don't use that library for any prototyping anymore
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