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每个人都想有真正属于自己的空间（可以是硬盘，硬盘上的一个分区，或者是一个目录，或者是U盘），存以前女友or男友的照片，存一些X片，而不希望别人看到，推荐一个免费好用的加密工具truecrypt。win和linux都可以用。

一，下载truecrypt

http://www.xdowns.com/soft/softdown.asp?softid=85603

下载下来的是truecrypt-7.1a-linux-x86.tar.zip，这里X86，一开始我以为是64位的机器用的，我的机子是32位，装的时候发现是32位的，我晕。

二，解压，安装truecrypt

这里解压分二分，也就是truecrypt-7.1a-linux-x86.tar.zip，是压缩了二次，

unzip truecrypt-7.1a-linux-x86.tar.zip
tar zxvf  truecrypt-7.1a-Linux-x86.tar.gz

经过这二步解压后会有一个truecrypt-7.1a-setup-x86这个可执行文件，

[root@localhost download]# ./truecrypt-7.1a-setup-x86 

TrueCrypt 7.1a Setup
____________________

Installation options:

 1) Install truecrypt_7.1a_i386.tar.gz
 2) Extract package file truecrypt_7.1a_i386.tar.gz and place it to /tmp

To select, enter 1 or 2: 1   //在这里选择1，

Before you can use, extract, or install TrueCrypt, you must accept the
terms of the TrueCrypt License.
。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
To uninstall TrueCrypt, please run 'truecrypt-uninstall.sh'.

Installing package...          //出现以下内容就说明装好了。
usr/bin/truecrypt
usr/bin/truecrypt-uninstall.sh
usr/share/applications/truecrypt.desktop
usr/share/pixmaps/truecrypt.xpm
usr/share/truecrypt/doc/License.txt
usr/share/truecrypt/doc/TrueCrypt User Guide.pdf

三，创建密码文件和加密分区

[root@localhost zhangy]# truecrypt --create-keyfile /home/zhangy/key.txt

Please type at least 320 randomly chosen characters and then press Enter:
Characters remaining: 218
Characters remaining: 149
Characters remaining: 60
Characters remaining: 3
Keyfile has been successfully created.

到这儿密码文件创建好了，上面的320是什么意思呢，让你随便输入320个字符。

[root@localhost zhangy]# truecrypt -c /home/zhangy/securt  //在这里有一个默认就是type normal
Volume type:
 1) Normal
 2) Hidden
Select [1]: 1

Enter volume size (sizeK/size[M]/sizeG): 200M

Encryption algorithm:
 1) AES
 2) Serpent
 3) Twofish
 4) AES-Twofish
 5) AES-Twofish-Serpent
 6) Serpent-AES
 7) Serpent-Twofish-AES
  Twofish-Serpent
Select [1]: 1

Hash algorithm:
 1) RIPEMD-160
 2) SHA-512
 3) Whirlpool
Select [1]: 2

Filesystem:
 1) None
 2) FAT
 3) Linux Ext2
 4) Linux Ext3
 5) Linux Ext4
Select [2]: 4

Enter password:
WARNING: Short passwords are easy to crack using brute force techniques!

We recommend choosing a password consisting of more than 20 characters. Are you sure you want to use a short password? (y=Yes/n=No) [No]: yes

Re-enter password: 

Enter keyfile path [none]: /home/zhangy/key.txt
Enter keyfile path [finish]: (回车)

Please type at least 320 randomly chosen characters and then press Enter:
Characters remaining: 207
Characters remaining: 98
Characters remaining: 49
Characters remaining: 6

Done: 100.000%  Speed:   41 MB/s  Left: 0 s          

The TrueCrypt volume has been successfully created.

到这儿加密分区就根好了，上面的文件/home/zhangy/securt可以换成硬盘分区，或者是U盘，U盘一般都/dev/sdb的。

四，挂载分区

mkdir /mnt/truecrypt   //创建挂载目录

[root@localhost zhangy]# truecrypt /home/zhangy/securt
Warning: Your system uses an old version of the Linux kernel.

Due to a bug in the Linux kernel, your system may stop responding when writing data to a TrueCrypt volume. This problem can be solved by upgrading the kernel to version 2.6.24 or later.
Enter mount directory [default]: /mnt/truecrypt
Enter password for /home/zhangy/securt:
Enter keyfile [none]: /home/zhangy/key.txt
Enter keyfile [finish]:
Protect hidden volume (if any)? (y=Yes/n=No) [No]: n

到这样就挂载好了，

这样我们就可以到/mnt/truecrypt目录下面写东西，这个东西保存在/home/zhangy/securt这个文件里面。

五，卸载分区

[root@localhost mnt]# umount /mnt/truecrypt/
[root@localhost mnt]# truecrypt -d /home/zhangy/securt

卸载后，如果想在写自己的秘密，就重新挂载，truecrypt /home/zhangy/securt，每次重新挂载都是要输入密码的。