Determining the Difficulty of a Brute Force Attack定难度一个蛮力攻击

The difficulty of a brute force attack depends on several factors, such as:困难一个蛮力攻击，取决于几个因素，例如：

• How long can the key be?如何能长久的关键是什么？
• How many possible values can each component of the key have?有多少可能的值可各组成部分的关键是什么？
• How long will it take to attempt each key?多久才能尝试每个关键？
• Is there a mechanism which will lock the attacker out after a number of failed attempts?是否有一个机制，这会锁定攻击后，一些失败的尝试？

As an example, imagine a system which only allows 4 digit PIN codes.作为一个例子，想象一个系统，只允许第4位数字密码。 This means that there are a maximum of 10,000 possible PIN combinations.这意味着有超过一万尽可能销组合。

Increasing Security Against a Brute Force Attack越来越多的安全对一个蛮力攻击

From the example above, PIN security could be increased by:从上面的例子中，密码的安全，可以增加：

• Increasing the length of the PIN增加长度的密码
• Allowing the PIN to contain characters other than numbers, such as * or #允许个人密码，以控制字符以外的其他号码，如*或＃
• Imposing a 30 second delay between failed authentication attempts制定一个30秒钟的延误之间没有认证的企图
• Locking the account after 5 failed authentication attempts锁定帐户后，五日未认证尝试