Ibrahim Saberi GeorgeIpsum

gpg-agent setup

Need to setup gpg-agent first, on OSX I use keychain (it also does ssh-agent)

$ brew info keychain
keychain: stable 2.8.5
User-friendly front-end to ssh-agent(1)
https://www.funtoo.org/Keychain
/usr/local/Cellar/keychain/2.8.5 (7 files, 108.5KB) *

File Magic Numbers

Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.

For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.

This gives an ongoing list of file-type magic numbers.

Image Files

POW?

[The idea isn't new.][1] It's a technique that asks the client to perform proof-of-work in order to increase the costs associated with spamming a website. For a single user the workload shouldn't be an issue at all, but a spammer (or indeed a brute-forcing hacker) might run into problems with being able to maintain a high throughput of requests. Validating the proof of work is trivially computational and hence will not put your server under the same amount of stress.

POWJS on my laptop takes 17 seconds to solve the problem in Chrome (50 seconds in IE 11) with 22 bits required to be zero. The workload can be started as soon as the user opens the page and will run asyncronously in the background (in a web worker if the browser supports them).

POWJS uses CryptoJS, but won't pollute your global namespace with it. This can't be used (as-is) to farm bitcoins or what-have-you, it merely performs a random POW.

	According to all known laws of aviation, there is no way a bee should be able to fly.
	Its wings are too small to get its fat little body off the ground.
	The bee, of course, flies anyway because bees don't care what humans think is impossible.
	Yellow, black. Yellow, black. Yellow, black. Yellow, black.
	Ooh, black and yellow!
	Let's shake it up a little.
	Barry! Breakfast is ready!
	Coming!
	Hang on a second.
	Hello?

	== Adb Server
	adb kill-server
	adb start-server

	== Adb Reboot
	adb reboot
	adb reboot recovery
	adb reboot-bootloader

	== Shell

	var express = require('express');
	var app = express.createServer();

	require('./settings').boot(app);

	app.dynamicHelpers({
	base: function(){
	// return the app's mount-point
	// so that urls can adjust. For example
	// if you run this example /post/add works

	0 22 * * 1,2,3,4,5 /path/to/git_changes.sh /path/to/projects/ # Sends 5 PM EST if server time is UTC
	0 21 * * 5 /path/to/git_changes.sh -w /path/to/projects # Sends Friday @ 4PM EST if server time is UTC

Ibrahim Saberi GeorgeIpsum

gpg-agent setup

File Magic Numbers

Image Files

POW?

Usage