sipa

Beyond IP Transactions: towards a payment protocol
==================================================

IP transactions were originally introduced as a first "out-of-band" protocol
for negotiating a transaction output's public key. Being inconvenient and
insecure, they became obsolete, and recent versions of bitcoin don't support
them anymore.

The result is that static bitcoin addresses have become the most common way of
defining requested payments. This may be fine for anonymous donations, but is not

piscisaureus

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

karlgluck

What's this all about?

Digital cryptography! This is a subject I've been interested in since taking a class with Prof. Fred Schneider back in college. Articles pop up on Hacker News fairly often that pique my interest and this technique is the result of one of them.

Specifically, this is about Lamport signatures. There are many signature algorithms (ECDSA and RSA are the most commonly used) but Lamport signatures are unique because they are formed using a hash function. Many cryptographers believe that this makes them resistant to attacks made possible by quantum computers.

How does a Lamport Signature work?

slothbag

2014-Mar-06 22:34:00 WRN Launching child 1
Loading: "/usr/src/rippled/build/rippled.cfg"
terminate called after throwing an instance of 'beast::BadLexicalCast'
  what():  std::bad_cast

gavinandresen

O(1) Block Propagation

The problem

Bitcoin miners want their newly-found blocks to propagate across the network as quickly as possible, because every millisecond of delay increases the chances that another block, found at about the same time, wins the "block race."

stevenroose

void enableSSL() {
  // the password used for the certutil db
  var sslPassword = ""; 

  // the certificate subject
  //  retrieved from certutil with command 
  //   > certutil -d sql:. -L -n my_domain
  //   and look for the "Subject: " line under certificate data
  var certificateName = "CN=mydomain.com,OU=...";

davecgh

package main

import (
	"encoding/hex"
	"fmt"
	"os"

	"github.com/btcsuite/btcd/chaincfg/chainhash"
	"github.com/btcsuite/btcd/txscript"
	"github.com/btcsuite/btcd/wire"

davecgh

package main

import (
	"encoding/hex"
	"fmt"

	"github.com/btcsuite/btcd/btcec"
	"github.com/btcsuite/btcd/chaincfg"
	"github.com/btcsuite/btcd/txscript"
	"github.com/btcsuite/btcd/wire"

calmh

Goals

Syncthing devices that store data in encrypted format. Such a device can participate fully in a cluster, but the information on the device is not directly usable.

Assumptions and Definitions

• There exists a secret key per folder, known only by devices that can access the unencrypted data. We call these "secure devices".

• Devices that do not know the secret key can only access encrypted data. We call these "insecure devices".

rustyrussell

#! /bin/sh

test_run()
{
    if [ "`./truncated-graph-traversal \"$1\"`" = "$2" ]; then
	echo "$2"
    else
	./truncated-graph-traversal "$1" >&2
	echo Expected "$2" >&2
	exit 1