Compress and encrypt directory in Linux

直接進入實作步驟~

Compress tools: tar

Data encrypt tools: AES Crypt (http://www.aescrypt.com/)

Objective-1, To backup /etc and encrypt it:

1. 壓縮並加密/etc:

# tar cvf - /etc | aescrypt -e -p 123456 -> etc.tar.aes

(-e: encrypt, -p password)

2. 測試etc.tar.aes是否有加密:

[root@localhost ~]# file etc.tar.aes

etc.tar.aes: data

[root@localhost ~]# tar tvf etc.tar.aes

tar: This does not look like a tar archive

tar: Skipping to next header

tar: Archive contains obsolescent base-64 headers

tar: Read 300 bytes from etc.tar.aes

tar: Error exit delayed from previous errors

測試結果發現到etc.tar.aes已經被AES加密了，故無法直接以tar觀看壓縮檔的內容。

Objective-2 To decrypt and uncompress data:

1. 將壓縮檔解密:

# aescrypt -d -p 123456 etc.tgz.aes 

解密後會新增一檔案為etc.tar

2. 解壓縮:

# tar xvf etc.tar

如此一來便可解開加密過後的壓縮檔了。

其它在Linux上常見的加密工具還有openssl與gpg。