Jeremy Bae opt9

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Introduction

C-a == Ctrl-a
M-a == Alt-a

General

:q        close
:w        write/saves
:wa[!]    write/save all windows [force]
:wq       write/save and close

JavaScript Crypto Libraries

List some crypto libraries for JavaScript out there. Might be a bit out dated. Scroll to the bottom.

WebCryptoAPI

http://www.w3.org/TR/WebCryptoAPI/

This specification describes a JavaScript API for performing basic cryptographic operations in web applications, such as hashing, signature generation and verification, and encryption and decryption. Additionally, it describes an API for applications to generate and/or manage the keying material necessary to perform these operations. Uses for this API range from user or service authentication, document or code signing, and the confidentiality and integrity of communications.

Git Submodules - Basic Explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of usecases of submodules:

Separate big codebases into multiple repositories.

Build Your Own LISP

I had fun building my own LISP (Slow Loris). The project was extremely easy to get off the ground, because there a ton of resources to do just this. I thought it might be handy to have a little links round-up, based on my research.

In Python

There are already several good projects out there on writing your own LISP in Python.

	#!/bin/bash
	# Install Monaco font in Linux
	# Version from nullvideo https://gist.github.com/rogerleite/99819#gistcomment-2799386

	sudo mkdir -p /usr/share/fonts/truetype/ttf-monaco && \
	sudo wget https://gist.github.com/rogerleite/b50866eb7f7b5950da01ae8927c5bd61/raw/862b6c9437f534d5899e4e68d60f9bf22f356312/mfont.ttf -O - > \
	/usr/share/fonts/truetype/ttf-monaco/Monaco_Linux.ttf && \
	sudo fc-cache

	This turns https://www.sec-consult.com/files/20120626-0_zend_framework_xxe_injection.txt
	into a Remote Command Execution:

	NOTE: It relies on the PHP expect module being loaded
	(see http://de.php.net/manual/en/book.expect.php)

	joern@vbox-1:/tmp$ cat /var/www/server.php
	<?
	require_once("/usr/share/php/libzend-framework-php/Zend/Loader/Autoloader.php");
	Zend_Loader_Autoloader::getInstance();

	mkvirtualenv datascience
	sudo apt-get install python-scipy libblas-dev liblapack-dev gfortran
	sudo apt-get install libffi-dev # for cryptography from scrapy
	sudo apt-get install libxslt-dev # for libxml from scrapy
	export BLAS=/usr/lib/libblas.so
	export LAPACK=/usr/lib/liblapack.so
	pip install numpy
	pip install scipy
	pip install scikit-learn
	pip install pandas

	import cv2.cv as cv
	import tesseract
	gray = cv.LoadImage('captcha.jpeg', cv.CV_LOAD_IMAGE_GRAYSCALE)
	cv.Threshold(gray, gray, 231, 255, cv.CV_THRESH_BINARY)
	api = tesseract.TessBaseAPI()
	api.Init(".","eng",tesseract.OEM_DEFAULT)
	api.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyz")
	api.SetPageSegMode(tesseract.PSM_SINGLE_WORD)
	tesseract.SetCvImage(gray,api)
	print api.GetUTF8Text()

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048