olbat

Create SSH tunnels using systemd units

Table of contents

• Overview
• Setup the SSH agent systemd unit
• Setup the SSH-tunnel systemd unit
• Create tunnels using systemd services
• Examples
• Create a tunnel to a web server on a machine that's only accessible by SSH

olbat

#!/bin/bash
set -euo pipefail

BLOCKLIST_URL='https://list.iblocklist.com/?list=bt_level1&fileformat=p2p&archiveformat=gz'
BLOCKLIST_FILE=/var/packages/DownloadStation/etc/download/blocklists/level1

echo "Clean old blocklist"
rm -f $(dirname $BLOCKLIST_FILE)/*

echo "Download new blocklist"

olbat

// https://developers.cloudflare.com/workers/about/ 
// https://tutorial.cloudflareworkers.com
//
// A Service Worker which adds Security Headers.
// Checks:
//     https://securityheaders.io/
//     https://observatory.mozilla.org/
//     https://csp-evaluator.withgoogle.com/
//     https://hstspreload.org/
//     https://www.ssllabs.com/ssltest/

olbat

Crypto Notes Week 1

The first half of the course will be about sym. enc. and the second half will be about public key enc.

Introduction and Prereqs

What is cryptography?

The core of cryptography is about:

• establishing a secret key between two parties

olbat

#!/bin/bash -e

####
# shlog is a bash script that allow you to record a shell session by logging
# command history and giving diff of edited files
####
# User notes:
# - Install:
# 	Load the script using 'source shlog.bash' (add it to your .bashrc
# 	to load it automatically)

olbat

Cryptography I

Cryptography is an indispensable tool for protecting information in computer systems. This course explains the inner workings of cryptographic primitives and how to correctly use them. Students will learn how to reason about the security of cryptographic constructions and how to apply this knowledge to real-world applications. More ...

Week 1

This week's topic is an overview of what cryptography is about as well as our first example ciphers. You will learn about pseudo-randomness and how to use it for encryption. We will also look at a few basic definitions of secure encryption.

Introduction

olbat

Course name: Cryptography 1 URL: https://class.coursera.org/crypto-007/class

Lectures

Week 1

Course Overview (11 min)

• HTTPS is actually not a protocol of its own. It’s simply regular HTTP on top of SSL/TLS.

olbat

/*
 * Copyright (C) 2006, 2007 Sarzyniec Luc <mail@olbat.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of

olbat

#!/usr/bin/python3

import sys
import unicodedata
import regex  # https://pypi.python.org/pypi/regex/

SPECIAL_CHARS = r"\-'"  # FIXME: French specific

RE_WHITESPACES = regex.compile(r"\p{Zs}+")
RE_SENTENCE_TERMS = regex.compile(r" *\p{STerm}+ *")

olbat

#!/usr/bin/python3
"""
usage: {} title data.txt [data2.txt ...] > histogram.png
"""

import sys
import math
import os.path
import matplotlib
matplotlib.use('Agg')