Yordan Radunchev yradunchev

GnuPG offline Master key using a YubiKey (for Arch Linux)

Introduction

This guide is a compilation of four other guides. It instructs how to create a set of GnuPG keys which the master key is offline and the actual subkeys only live inside your YubiKey (acting as a smartcard). What ends up in your (online) daily machine are only the stubs of the subkeys.

Install required software

Convert audio to video with ffmpeg - examples

avectorscope

ffmpeg -i input.mp3 -filter_complex "[0:a]avectorscope=s=1920x1080,format=yuv420p[v]" -map "[v]" -map 0:a avectorscope.mp4

showcqt

ffmpeg -i input.mp3 -filter_complex "[0:a]showcqt=s=1920x1080,format=yuv420p[v]" -map "[v]" -map 0:a showcqt.mp4

ahistogram

ffmpeg -i input.mp3 -filter_complex "[0:a]ahistogram=s=1920x1080,format=yuv420p[v]" -map "[v]" -map 0:a ahistogram.mp4

id3tags.txt:

;FFMETADATA1
title="Title"
artist=Artist
album_artist=Artist
album=Album
copyright=Copyright 2019
track=01

genre=(186)

Sudoers

pacman -S sudo

Use sed to uncomment the wheel group from sudoers, then hijack the EDITOR variable to copy the modified version back via visudo.

sed 's/# %wheel ALL=(ALL) NOPASSWD: ALL/%wheel ALL=(ALL) NOPASSWD: ALL/g' /etc/sudoers > /etc/sudoers.new
EDITOR="cp /etc/sudoers.new" visudo

rm /etc/sudoers.new

	#!/bin/bash

	# uses https://github.com/jonhoo/mktrayicona to add tray icon

	PID=$(pgrep ikec)
	SITENAME=SITENAME
	VPNUSER=USERNAME
	VPNPASS=PASSWORD
	LOG=$HOME/.vpn.out
	ERR=$HOME/.vpn.err

	#!/bin/bash

	strsplits=($(ssss-split -t 3 -n 5 -s 256 -Q <<< ${1}))
	for (( i=0; i<=$(( ${#strsplits[*]} -1 )); i++ ))
	do
	qrencode -o key_${i}.png ${strsplits[$i]}
	done

	1. Copy/Paste the information below to the clipboard
	2. Open the spreadsheet whose sheets need to be alphabetised
	3. Choose Tools > Script editor > Blank (this opens a new tab in the browser)
	4. Press Control+A followed by Control+V copy and paste the script in
	5. Press Control+S to save the script
	6. Choose Run > sortSheets
	7. Go back to the spreadsheet tab to view the new sorted tab order

	--Copy everything below this line--
	function sortSheets () {

	ffmpeg -i test.wav -y -loop 1 -i bg.jpg -filter_complex \
	"[0:a]showfreqs=cmode=separate:mode=bar:ascale=cbrt:fscale=log:s=600x600:colors=#ffffff[tmp]; \
	[tmp]alphaextract,format=yuv420p,split=3[box][up][down]; \
	[up]crop=in_w:in_h/2:0:0[up]; \
	[down]crop=in_w:in_h/2:0:in_h/2,vflip[down];[up][down]vstack[tmp]; \
	[tmp]gblur=sigma=10,curves=master='0/0 0.49/0 0.51/1 1/1',format=rgba[tmp]; \
	[box]drawbox=w=600:h=600:c=#ffffff:t=fill:replace=1,format=rgba[box]; \
	[box][tmp]alphamerge[tmp]; \
	[tmp]crop=in_w:in_h/2:0:in_h/4[tmp]; \
	[1:v]scale=1280:-1,crop=in_w:720[bg]; \

	<?xml version="1.1" encoding="utf-8"?>
	<rack><plugin type="mono" instance-name="Mono Input" input-index="1" output-index="1">
	<preset bank="0" program="0" plugin="mono" name="">
	<param name="bypass" value="0" />
	<param name="level_in" value="1" />
	<param name="level_out" value="1" />
	<param name="meter_in" value="0" />
	<param name="meter_outL" value="0" />
	<param name="meter_outR" value="0" />
	<param name="clip_in" value="0" />

	# Creating a system sound monitor
	pcm.pulse_monitor {
	type pulse
	device alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
	}

	ctl.pulse_monitor {
	type pulse
	device alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
	}