文件夹加密ecryptfs-utils

# How to encrypt data in linux(Debian/Ubuntu)
## Using ecryptfs-utils

1. Change location to your home directory
```shell
cd ~
```

2. Install ecryptfs-utils and load the kernel module
```
sudo apt-get install -y ecryptfs-utils
sudo modprobe ecryptfs
```

3. Setup your private directory, you need to type password for 3 times,The first one is your system login password,  the second and the third one is your directory encrypt password.
```
ecryptfs-setup-private
```

4. Mount the encrypted directory. You'll need your directory encrypt passphrase here.You can also click on "Access Your Private Data" in /home/${username}/Private in GUI
```
ecryptfs-mount-private
```

5. Check if it's mounted. If step 4 works, it will shows a message like: `/home/username/.Private  477G  216G  238G  48% /home/username/Private`
```
df -h | grep Private
```

6. Move or Copy your data into the mounted directory. After you logout. The directory will auto umount and ecrypt your data. If you want to access your data you'll need to do step 4 again.
---
## Using ZIP
If you want to encrypt your directory and decrypt it anywhere, please follow these steps:

1. Create an encrypt zip file.
```
zip -rP ${password} ${zip file} ${source file}
```
- Example:
```
zip -rP IamAPassword /path/to/zipfile.zip /path/to/sourcedir
```
2. Unzip the zip file
```
unzip ${zip file}
```
- Example:
```
unzip zipfile.zip
```