故事是這樣的，某~~(N)~~大~~(T)~~學~~(U)~~的某系之夜弄了一個網站，上面有幾個 JS + canvas 寫的小遊戲，看到小遊戲我怎麼能夠放過不玩~~（弄）~~呢？
Tech Rain
function Encode_orig(t, n) {
var i = 'abcdefghijklmnopqrstuvwxyz0123456789{:}"!@.$%,&*()_+ABCDEFGHIJKLMNOPQRSTUVWXYZ?',
o = {},
e = i.length;
n %= e, 0 == n && (n = 2);
for (var r = 0; e > r; r++) o[i[r]] = r;
for (var …
這篇文章原本是要寫給學校的老師看的，覺得可以拿來資安科普所以就貼到 Blog 吧！
首先，考慮以下 PHP 程式碼
<?php
function login($user, $pass) {
$sql = "SELECT * FROM `users` WHERE `name` = '$user' AND `password` = SHA1('$pass')";
$user = query($sql);
if (count($user) > 0)
return $user[0];
else
return false;
}
$user = login($_POST['user'], $_POST['pass']);
if ($user !== false)
echo …
#include <cstring> // for memcpy
#define NEW2D(H, W, T) (T **)new2d(H, W, sizeof(T))
#define CPY2D(TAR, SRC, H, W, T) cpy2d((void**)TAR, (void**)SRC, H, W, sizeof(T))
#define DEL2D(P) (delete [] P)
void cpy2d(void** tar, void** src, int h, int w, int size) {
for …