#bitcoin-wizards on 2018-09-29 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 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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01:07 <RubenSomsen> sipa: Ah thanks, I remember the email. The name threw me off. I thought it was related to graftroot.

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19:50 <jimpo> In secp256k1_ecmult_gen, it does both this "blind" multiplication, where it offsets the multiplicand by a random blinding factor, and uses just constant-time conditional moves for the actual multiplication

19:50 <jimpo> Why is the blinding necessary?

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20:55 <andytoshi> jimpo: so that any power/timing sidechannels will be blinded be the randomizing factor. it's a defense in depth thing

20:55 <andytoshi> this is the one you've gotta know about and call secp256k1_context_randomize IIRC

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