aIex quiterio alex-quiterio

Security is Hard

Massive Assignment

watch for ActiveRecord Relation, like has_many, has_many :through
watch for user_roles, `group_users
UPDATE action

Admin

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	def swap_string(string)
	i = 0
	j = string.length - 1

	while i < j do
	string[i] = (string[i].ord ^ string[j].ord).chr
	string[j] = (string[i].ord ^ string[j].ord).chr
	string[i] = (string[i].ord ^ string[j].ord).chr
	i+=1
	j-=1

	# A simplified version of Ruby's object system, implemented in Ruby. This only
	# supports a subset of Ruby, but is intended to accurately model inheritance
	# and method lookup in as little code as possible, for ease of understanding by
	# Ruby programmers.
	#
	# Classes implemented:
	#
	# * Object
	# * Module < Object
	# * Class < Module

	package main

	import (
	"flag"
	"fmt"
	"io/ioutil"
	"net/http"
	"runtime"
	"sync"
	"time"

	natural_primer = ->(number) {
	primes = [1]
	number.times do
	next_prime = primes.reduce(:*) + 1
	primes << next_prime
	end
	puts primes[1..-1].join(', ')
	}

	# A password hashing function insipred by Lamport OTP (a.k.a. hash chains)
	# Memory factor: length of the Lamport OTP sequence
	# Compute factor: number of independent Lamport OTP sequences to compute
	# Hash: a keyed hash function
	#
	# Finally, all of the Lamport OTP chains calculated are concatenated and hashed
	# to produce the resulting digest
	#
	# Just for fun, this has been implemented with threads to demonstrate how easily
	# it can be parallelized, much like CTR mode (NOTE: you will need JRuby or Rubinius

	var self = window;

	(function(self) {

	var canvas, context, particles = [], explode = true, FPS = 60;

	/*
	* Init.
	*/

	class ApplicationController < ActionController::Base

	caches_action :render_html,
	:cache_path => Proc.new { "#{LastChange::last_update}/pages/#{params[:cms_path]}" },
	:if => Proc.new { controller_name == "cms_content" }
	end

	public class Test {
	@Assertion("foo>0")
	int foo=1;

	@Assertion("bar%2==0")
	long bar;

	@Assertion("baz>foo")
	int baz;