sipa

Moved to https://github.com/sipa/writeups/tree/main/minimizing-golomb-filters

jFransham

Achieving warp speed with Rust

Contents:

• Number one optimization tip: don't
• Never optimize blindly
• Don't bother optimizing one-time costs
• Improve your algorithms
• CPU architecture primer
• Keep as much as possible in cache
• Keep as much as possible in registers

KodrAus

Profiling performance

Using perf:

$ perf record -g binary
$ perf script | stackcollapse-perf.pl | rust-unmangle | flamegraph.pl > flame.svg

NOTE: See @GabrielMajeri's comments below about the -g option.

chris-belcher

The Problem

JoinMarket has a problem where it assumes different nicknames have different bitcoin wallets. This can be exploited by people running multiple yield generator bots from the same wallet, so they get a higher rate of profit at the expense of de-legitimizing the system for privacy.

Crypto primitive 1: Merkle Tree

A merkle tree is a way of producing a commitment to a set, which can later can prove that elements are contained within the set using only O(logN) data, and only revealing one other element in the set.

For example here is a merkle tree commiting to a set of numbers {6, 3, 9, 0, 8, 4, 7, 2}

bmhatfield

# In order for gpg to find gpg-agent, gpg-agent must be running, and there must be an env
# variable pointing GPG to the gpg-agent socket. This little script, which must be sourced
# in your shell's init script (ie, .bash_profile, .zshrc, whatever), will either start
# gpg-agent or set up the GPG_AGENT_INFO variable if it's already running.

# Add the following to your shell init to set up gpg-agent automatically for every shell
if [ -f ~/.gnupg/.gpg-agent-info ] && [ -n "$(pgrep gpg-agent)" ]; then
    source ~/.gnupg/.gpg-agent-info
    export GPG_AGENT_INFO
else

oanhnn

Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

1. Generate ssh key pairs for accounts and add them to GitHub accounts.

jordandee

// To compile with gcc:  (tested on Ubuntu 14.04 64bit):
//	 g++ sdl2_opengl.cpp -lSDL2 -lGL
// To compile with msvc: (tested on Windows 7 64bit)
//   cl sdl2_opengl.cpp /I C:\sdl2path\include /link C:\path\SDL2.lib C:\path\SDL2main.lib /SUBSYSTEM:CONSOLE /NODEFAULTLIB:libcmtd.lib opengl32.lib

#include <stdio.h>
#include <stdint.h>
#include <assert.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>

campaul

/*
    Simple HTTP proxy in Rust. Hard coded to proxy rust-lang.org.
*/

extern crate hyper;

use std::io::Read;

use hyper::Client;
use hyper::header::Connection;

byronhe

现代密码学实践指南[2015年]

标签（空格分隔）： 密码学

---

本文介绍目前现代密码学的最先进技术， 前半部分主要翻译自 《Cryptographic Right Answers》，附上收集的资料，和byron个人的理解。

dcrystalj

doskey subl="C:\Program Files\Sublime Text 2\sublime_text.exe" $*
doskey ls=ls $1 --color
doskey ll=ls -la --color
doskey sbl    = sublime $*
doskey sshs   = ssh [email protected]
doskey oocd   = openocd-x64-0.6.1 -f  .\stm32f4discovery.cfg
doskey oocd7  = openocd-x64-0.7.0 -f  .\stm32f4discovery.cfg
doskey sshkey = type C:\Users\dcrystalj\.ssh\id_rsa.pub | clip & echo "ssh key in clipboard"

:: Git