Michael Starke mstarke

This guide is unmaintained and was created for a specific workshop in 2017. It remains as a legacy reference. Use at your own risk.

Running your own encrypted chat service with Matrix and Riot

Workshop Instructor:

This workshop is distributed under a CC BY-SA 4.0 license.

The dynamic wallpaper in MacOS Mojave is a single 114 MB .heic file that seems to contain 16 embedded images.

It also contains the following binary plist data in its metadata under the key "Solar". It's an array of 16 items, each with four keys:

i (integer). This seems to be the image index.
o (integer). This is always 1 or 0. Stephen Radford thinks it indicates dark mode (0) vs. light mode (1).
a (decimal). I’m pretty sure this is the angle of the sun over the horizon. 0º = sunset/sunrise. 90º = sun directly overhead. Negative values = sun below horizon.
z (decimal). This seems to be the cardinal position of the sun relative to the camera. 0º = sun is directly in front of the camera. 90º = sun is directly to the right of the camera. 180º = sun is directly behind the camera.

	# Update, upgrade and install development tools:
	apt-get update
	apt-get -y upgrade
	apt-get -y install build-essential
	apt-get -y install git-core

	# Install rbenv
	git clone git://github.com/sstephenson/rbenv.git /usr/local/rbenv

	# Add rbenv to the path:

	#!/usr/bin/ruby
	# Create display override file to force Mac OS X to use RGB mode for Display
	# see http://embdev.net/topic/284710

	require 'base64'

	data=`ioreg -l -d0 -w 0 -r -c AppleDisplay`

	edids=data.scan(/IODisplayEDID.*?<([a-z0-9]+)>/i).flatten
	vendorids=data.scan(/DisplayVendorID.*?([0-9]+)/i).flatten

	Convention: Byte array notation as it would appear in a hexeditor.

	= Layout=

	KDBX files, the keepass database files, are layout as follows:

	1) Bytes 0-3: Primary identifier, common across all kdbx versions:
	private static $sigByte1=[0x03,0xD9,0xA2,0x9A];

	2) Bytes 4-7: Secondary identifier. Byte 4 can be used to identify the file version (0x67 is latest, 0x66 is the KeePass 2 pre-release format and 0x55 is KeePass 1)

	#!/usr/bin/env bash

	# sources
	https://drive.google.com/drive/folders/1MP0cNLyJjzPLNrvNDCZv9hRuif091f0c
	https://apple.stackexchange.com/questions/358651/unable-to-completely-uninstall-zoom-meeting-app
	https://medium.com/bugbountywriteup/zoom-zero-day-4-million-webcams-maybe-an-rce-just-get-them-to-visit-your-website-ac75c83f4ef5

	echo Stopping Zoom...
	pkill "zoom.us"