wumpus changed the topic of #bitcoin-wizards to: This channel is 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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<nsh>
--
<nsh>
Surprisingly this works not only against symmetric keys such as AES or generic HMAC secrets but also against elliptic-curve private keys (RSA, plain DSA and Diffie-Hellman were not affected.) This is an implementation quirk: these mechanisms are typically intended for symmetric-keys only. For elliptic-curve keys, the byte array being truncated is the secret scalar part of the key. For example the “secret” component for a Bitcoin ECDSA key is a discre
<nsh>
te logarithm in secp256k1. Internally that discrete logarithms is just stored as 32-byte scalar value, and extract-key-from-key can be used to successively reveal chunks of that scalar value.
<nsh>
[don't implement everything in PKCS#11 or people may create two-byte substrings of your secrets and break them piecewise, and then you will have a Bad Time]
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<nsh>
'One limitation of this approach is that some secrets are intended for key-derivation. For example that secp256k1 private-key could have been used for ECDH key-agreement. That operation happens to be considered “key-derivation” according PKCS#11. That means CKA_DERIVE can not be set to false without rendering the key unusable. Per-object policy does not distinguish between derivation mechanisms at a granular level.'
<nsh>
heh
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<yoleaux>
"The Paillier cryptosystem, named after and invented by Pascal Paillier in 1999, is a probabilistic asymmetric algorithm for public key cryptography. The problem of computing n-th residue classes is believed to be computationally difficult." — https://en.wikipedia.org/wiki/Paillier_cryptosystem
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<ThomasV>
!seen aschildbach
<gribble>
I have not seen aschildbach.
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<Iriez>
Are any of the maintainers in contact with the W3C people? I see ripple has invested a reasonable amount of effort.
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<maaku>
Iriez: maintainers of what?
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