Everyone

Nikolay Elenkov

Honeycomb

Changes the Android disk encryption password

New: Experimental Lollipop support. <b>Requires</b> SuperSU

If you are using a pattern lock, enter the current password as 

a sequence of dot numbers. 

Dots are numbered left-to-right, top-to-bottom, starting with 1: 

1    2    3

4    5    6

7    8    9

This tool REQUIRES root access to work. If you are not using disk encryption this tool will not be useful to you. In fact, it will not even start on your device. 

*** WARNING ***

If you forget the new password after you change it, you will not be able to boot  the device. You will have to perform a factory reset, DELETING all your data. Make sure you take a full backup before using this tool, and REMEMBER THE PASSWORD. You have been warned, use at your own risk!

 

Android 3.0 (Honeycomb) introduced disk encryption and it has been available on all subsequent versions. It encrypts the data partition with a key protected by a user-selected password and requires entering the password in order to boot the device. However, Android uses the device unlock password or PIN as the device encryption password, and doesn't allow you to change them separately. This effectively forces you  to use a simple password, since you have to enter it each time you unlock your device, usually dozens of times a day. This tool allows you to change the encryption password to a more secure one, without affecting the screen unlock password/PIN. To change the device encryption password simply: 

 1. Enter the current password

 (initially the same as the unlock password/PIN)

 2. Enter and confirm the new password

 3. Hit 'Change password'

The changes take effect immediately, but you will only be required to enter the new password the next time you boot your device. Make sure you choose a good password, not based on a dictionary word, since automated tools can brute force a simple password in minutes. Above all, make sure you REMEMBER the new password. 

If you change the device unlock password/PIN, the encryption password will be automatically changed as well. You need to use this tool again to change it back, if required. 

More details and some background information here: 

http://nelenkov.blogspot.com/2012/08/changing-androids-disk-encryption.html

Not supported on Android L, but may not be required due to changes to disk encryption implementation. 

More details about Android L: 

http://nelenkov.blogspot.com/2014/10/revisiting-android-disk-encryption.html

This tool is open source. Code is available on Github under the Apache 2.0 license. 

https://github.com/nelenkov/cryptfs-password-manager

Tested on Galaxy Nexus with

  * stock Jelly Bean (4.1.1)

  * CyanognenMod 9 (4.0.4)

NO WARRANTY. Use at your own risk.

</div> <div jsname="WJz9Hc" style="display:none">更改Android的磁盘加密密码

新：实验棒棒糖支持。 <b>要求 SuperSU

如果您正在使用的模式锁定，输入当前的密码为

一序列点的数字。

点被编号为左到右，顶到底部，从1：

1 2 3

4 5 6

7 8 9

这个工具需要root访问权限的工作。如果你不使用磁盘加密这个工具不会对你有用。事实上，它甚至不会启动您的设备上。

*** ***警告

如果你忘记了你之后更改新密码，您将无法启动设备。你将不得不执行出厂重置，删除所有数据。确保你把一个完整备份使用这个工具之前，并记住密码。你已经被警告，使用风险自负！

 

Android的3.0（蜂巢）推出的磁盘加密，它​​已经适用于所有后续版本。它加密与由用户选择的密码保护的密钥数据分区，并且需要以引导设备输入密码。然而，Android使用设备的解锁密码或PIN的设备加密密码，并且不允许您分别更改。这有效地迫使你用一个简单的密码，因为你在每次解锁设备，通常数十次一天的时间来输入。这个工具允许您更改加密密码更安全的，不影响屏幕解锁密码/ PIN。要更改设备的加密密码简单：

 1.输入当前的密码

 （最初一样的解锁密码/ PIN）

 2.输入并确认新密码

 3.点击“更改密码”

这些变化将立即生效，但你只需要你启动的设备下一次输入新密码。确保你选择一个好的密码，而不是根据字典中的单词，因为自动化工具可以蛮力在几分钟内简单的密码。最重要的是，一定要记住新密码。

如果您更改设备解锁密码/ PIN，加密密码会自动改变。您需要使用这个工具再改回来，如果需要的话。

更多的细节和这里的一些背景资料：

http://nelenkov.blogspot.com/2012/08/changing-androids-disk-encryption.html

不支持在Android L，但可能并不需要因更改磁盘加密实现。

关于Android L的详细信息：

http://nelenkov.blogspot.com/2014/10/revisiting-android-disk-encryption.html

这个工具是开源的。代码可以在Github根据Apache 2.0许可。

https://github.com/nelenkov/cryptfs-password-manager

测试了Galaxy Nexus的使用

  *股票果冻豆（4.1.1）

  * CyanognenMod 9（4.0.4）

无担保。使用需要您自担风险。

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Cryptfs Password

Cryptfs Password的最新版本