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 |
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<
bitcoin-wizards6 >
hi
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<
waxwing >
are the 64 bit nonce culprits known? :)
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<
waxwing >
wow fascinating anecdote - the darkwallet 3 of 5 multisig had one of the 5 keys compromised by weak nonces.
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<
gmaxwell >
waxwing: well we should be able to find out what software they used...
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<
gmaxwell >
presumably ... darkwallet.
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<
waxwing >
you mean the 64 bit cases? i mentioned that because it seemed like that classification had the biggest number of compromises.
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<
waxwing >
well no i guess you meant the darkwallet case, only. yeah maybe.
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<
gmaxwell >
was the darkwallet one compromised by a 64-bit nonce?
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<
waxwing >
it says they contacted amir and he told them the signatures had been calculated manually
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<
waxwing >
i'd bet he was using that libbitcoin thing he did, was it 'sx'?
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<
waxwing >
just reading the doc here, it's pg13 or so. you get quoted shortly before :)
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<
waxwing >
why the heck did anyone use 2^-1 G for a nonce, that's so weird :)
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<
sipa >
tiny signature :)
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<
waxwing >
doh, of course yeah
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<
sipa >
(variable length encoding for R in ECDSA)
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<
waxwing >
bragging rights ... for a while anyway :)
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<
waxwing >
BIP 404 ... all signatures shall use the most compact form, where k=2^-1 G
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<
gmaxwell >
yea, that was intentional on keys there the private key was known.
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<
waxwing >
ah right, skim read before. does actually make sense.
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