On Sun, Oct 5, 2014 at 4:40 PM, Gregory Maxwell <gmaxw...@gmail.com> > I should point you to some of the tools that have been discussed in > the past which are potentially helpful here:
Ah, I should also mention a somewhat more far out approach which helps here as a side effect: If transactions were using the BLS short signature scheme (a very compact EC signature based on pairing cryptography) there is a scheme so that you securely can aggregate the signatures from multiple messages into a single signature (also has nice bandwidth properties) and still verify it. It also works recursively, so aggregates can be further aggregated. A consequence of this is that you cannot remove a (set of) signature(s) from the aggregate without knowing the (set of) signature(s) by itself. If the coinbase transaction also contains a signature and if some non-trivial portion of fee paying users relayed their transaction privately to miners it, then other miners would only learn of the transaction in aggregated form. Without knowing the transaction by itself they could not pull it out of a block separately from the coinbase payment and add it to their own block in a fork. (In general this provides several anti-censorship properties, since if someone passed you an aggregate of several transactions you could only accept or reject them as a group unless you knew the members separately). The use in aggregation can be done in a way which is purely additive (e.g. in addition to regular DSA signatures), so even if the cryptosystem is broken the only harm would be allowing disaggregation... but unfortunately the pairing crypto is pretty slow (verification takes a 0.5ms-ish pairing operation per transaction). ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
