x0nu11byt3

ELF Format Cheatsheet

Introduction

Executable and Linkable Format (ELF), is the default binary format on Linux-based systems.

Compilation

rjhansen

SKS Keyserver Network Under Attack

This work is released under a Creative Commons Attribution-NoDerivatives 4.0 International License.

Terminological Note

"OpenPGP" refers to the OpenPGP protocol, in much the same way that HTML refers to the protocol that specifies how to write a web page. "GnuPG", "SequoiaPGP", "OpenPGP.js", and others are implementations of the OpenPGP protocol in the same way that Mozilla Firefox, Google Chromium, and Microsoft Edge refer to software packages that process HTML data.

Who am I?

tintoy

#!/usr/bin/env python3

import os
import paramiko

ssh_key_filename = os.getenv('HOME') + '/.ssh/id_rsa'

jumpbox_public_addr = '168.128.52.199'
jumpbox_private_addr = '10.0.5.10'
target_addr = '10.0.5.20'

bobuk

от Али-Бабы и разбойников, к лье под водой и к вархаммеру

Давайте я сразу скажу - речь пойдет о биткоинах. При этом не буду вас агитировать за или против - это вообще не мое дело. Я просто расскажу вам о своем отношении к этому феномену и мифам вокруг него.

Для начала стоит сказать, что я не рассматриваю биткоин как валюту. Это не средство, которое заменит кредитные карты или ежедневные расчеты - для этого есть lightning network и другие средства децентрализации. Для меня биткоин - это актив, максимально похожий на золото во всех его проявлениях, кроме физического присутствия. Биткоины добывают, причем, чем больше биткоинов люди уже добыли, тем сложнее добывать дальше. Количество биткоинов, которые вообще можно будет добыть и пустить в оборот, фиксировано. Обмен биткоинами происходит “из рук в руки”. Хранить биткоины не трудно, затратно только получить или передать их. Замените “биткоины” на “золото” - каждое из этих заявлений так же будет действительно.

Поведение “золотых с

sirenko

Learning How To Learn

Module 1 - What is Learning

Focused/Diffuse Modes Thinking

• Obviously ‘focused’ is when you’re concentrating. Direct approach to solving familiar problems.
• Focused: thoughts move through nicely-paved road of familiar notions (neural pattern looks very tight and directed).
  • encompasses rational, sequential, analytical approaches to thinking

Jamesits

#!/bin/bash
set -eu

SYSCTL_FILE=/etc/sysctl.d/90-tcp-bbr.conf

# check root
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 
   exit 1
fi

danidiaz

Papers

Time clock and the ordering of events in a distributed system

Consensus on Transaction Commit

An empirical study on the correctness of formally verified distributed systems

Byzantizing Paxos by Refinement

pyos

#pragma once

#include "cone.h"

#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include <memory>

reborg

Rich Already Answered That!

A list of commonly asked questions, design decisions, reasons why Clojure is the way it is as they were answered directly by Rich (even when from many years ago, those answers are pretty much valid today!). Feel free to point friends and colleagues here next time they ask (again). Answers are pasted verbatim (I've made small adjustments for readibility, but never changed a sentence) from mailing lists, articles, chats.

How to use:

• The link in the table of content jumps at the copy of the answer on this page.
• The link on the answer itself points back at the original post.

Table of Content

spaze

2023 update

ℹ️ Please note this research is from 2016 when Opera has first added their browser "VPN", even before the "Chinese deal" was closed. They have since introduced some real VPN apps but this below is not about them.

🕵️ Some folks also like to use this article to show a proof that the Opera browser is a spyware or that Opera sells all your data to 3rd parties or something like that. This article here doesn't say anything like that.

---

When setting up (that's immediately when user enables it in settings) Opera VPN sends few API requests to https://api.surfeasy.com to obtain credentials and proxy IPs, see below, also see The Oprah Proxy.

The browser then talks to a proxy de0.opera-proxy.net (when VPN location is set to Germany), it's IP address can only be resolved from within Opera when VPN is on, it's 185.108.219.42 (or similar, see below). It's an HTTP/S proxy which requires auth.