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
<rusty>
sipa: done. And diagnosed correctly, it's one of our weird warning flags which triggers, not -Wall.
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<sipa>
rusty: yeah, it's perfectly legal C, but specifying void is much more specific
<rusty>
sipa: perfectly legal but very deceptive, since you can currently call "minisketch_implementation_max(1000, "Hello world!")" in C and get no complaints.
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<Blackwolfsa>
In confidential transactions with pedersen commitments, is there any security reasons why reusing a blinding factor is bad?
<Blackwolfsa>
apart from potential privacy reasons.
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<Varunram>
Blackwolfsa: I think revealing it would break security
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<Blackwolfsa>
you have v.H + k.G in a commitment. Revealing k would break it yes, but I cant see how reusing k, reveals k, or even if you reveal k.G you dont reveal K, which is the security
<Blackwolfsa>
If you have k.G, computing/guessing v, is not that infeasable, but that only breaks the privacy
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<Varunram>
Blackwolfsa: In Pedersen, wouldn't you define the security of the scheme as not being able to find out the commitment value?
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<Varunram>
sorry, internet pooped out
<Blackwolfsa>
In a confidential transaction the security does not lie in the visibility of the committed value.
<Varunram>
in a CT, there are two properties - hiding and binding
<Varunram>
as you know already
<Blackwolfsa>
For example in mimblewimble which uses CT, coinbase transaction's values are known, but they are still secure
<Varunram>
reusing the blinding factor would reveal the commitment value and address
<Varunram>
true
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<Varunram>
ah, I get it. my bad, it breaks hiding, not security
<Blackwolfsa>
in CT as far as I can tell the security only lies in the blinding factor k, which should at all times stay secret. But k.G can be known and is known for example in coinbase transactions
<Varunram>
oh
<Blackwolfsa>
If you know v, you can compute v.H, if you know v.H, you can subtract that from the commitment and compute k.G
<Blackwolfsa>
But knowing k.G does not allow you to compute k.
<Varunram>
yes, discrete log
<Blackwolfsa>
Yes, that why I want to know apart from the privacy (that might me compromised), is it bad to reuse k?
<Blackwolfsa>
Because I cant see a reason why
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<Varunram>
sorry if this is the wrong place but dunno where else to ask. Does someone have a large amount of testnet coins (>1) to spare? thanks in advance! 2N1TSArdd2pt9RoqE3LXY55ixpRE9e5aot8
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<instagibbs>
"is there any security reasons why reusing a blinding factor is bad?" It's just a privacy loss.
<instagibbs>
well, it's a security loss in mimblewimble :)
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<Blackwolfsa>
instagibbs how is it a security loss in mimblewimble?
<instagibbs>
If your blinding factors are given to someone else the funds can be directly taken, i.e., there is no additional spending condition
<Blackwolfsa>
yes if you give our your "k", But reusing k does not reveal k, it might (i dont think it does) reveal k.G, but thats not your blinding factor, thats the pubic key
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<instagibbs>
I never said it revealed it, just that it's a potential security issue in addition to privacy. I could make some maybe contrived scenarios but don't feel like filling this channel
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