几年前我移植的一款遗留应用使用了第三方回调系统来处理支付。问题是，回调脚本没有检查支付的金额是否等于订单的价格，因此可以使用Firebug编辑支付页面上“金额”字段的内容，以0.01英镑的价格购买网站上的任何产品。

我曾经接手了一个系统的开发，这个系统在全国有200个客户在使用，它有硬编码的密码。是的，代码实际上写着:

if password = "a"

去年，我离开了一家汽车ERP公司，该公司数百个客户的服务器上都有相同的管理密码。我猜我走后他们没有全部换掉。

I was going to earn my credit with the supervisor for my quite advanced graphics program at a SunOS / Solaris with instant messaging enabled where with zephyr.vars or whatever it was called you could make an image appear on your listed friend's screen like if you alowed me I could just send you an image that appeared on your display. While I was demoing the program I had written so that the supervisor could give me credit for it, one of my friends sitting close or in the next room made the photo big-mama.xxx appear on my screen. There was never any discussion or penalty because of the incident and I got credit for the project that for ½ second seemed like it was programmed to display big-mama.xxx instead of solving the problem. (Earlier) I updated perl scripts and waited for sysadmin to reflect the changes to ouside the FW. Then the database was gone and it was not a bug it was a feature since the data was stored with the source and therefore updating the source blanked the persistence.

物理访问或模拟登录提示或登录屏幕是另外两种困难的情况，不需要过多的算法技术，很容易理解物理访问提供了许多可能性，模拟登录提示是您可以在许多不同类型的计算机和环境上进行的事情。

我曾经忘记删除“管理员登录页面”。该页面只是绕过LDAP登录并获得所有权限。它可以对客户的银行账户做任何事情。我非常非常担心。幸运的是，没有人知道URL。

我的朋友曾经用PHP编写了一个论坛脚本。密码保存为一个名为pass.txt的纯文本文件。当然，每个人都可以访问那个文件。

一些验证码是这样的:

public bool charsEquals(char[] input, char[] txt)
{
    for (int i = 0; i < Math.min(input.length; txt.length); ++i)
    {
        if (input[i] != txt[i]) return false;
    }
    return true;
}

像这样使用它:

if (charsEquals(inputPassword, requestedPassword))

看了YouTube上关于Tux和比尔·盖茨之战的搞笑视频后，我开始思考这个问题。当Tux没有密码进入微软大楼时。