How to use Vim to password protect files in Linux

Vim has an-X option that allows you to encrypt files when you create them. Once you run the following VIM command, you will be prompted to enter a key:

$ vim-x file.txt Warning: Weak encryption method is being used; see: Help ' cm ' Input encryption key: ******* Enter the same key again: *******

If you enter the key correctly for the second time, you can modify the file.

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Password-protected Vim files

When you're done, press ESC and type: Wq to save and close the file. Next time you want to open it and edit it, you have to enter the key like this:

$ vim file.txt requires "file.txt" encryption key warning: Weak encryption method is being used; see: Help ' cm ' input key: *******

Suppose you lose a wrong password (or you don't lose the password), you'll see some junk characters.

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Encrypted content in Vim

Setting a strong encryption method in Vim

Note: The warning message implies that the protected file is a weak encryption method. So next, let's look at how to set up a strong encryption method in Vim.

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Weak file encryption in Vim

In order to view the encryption method (cm) set, type the following:

: Help ' cm '

Sample output:

                                          * ' cryptmethod ' * * ' cm ' * thod '        string    (default   "Zip")                        Global or local to buffer  |global-local|                      {not in  Vi}  the encryption method used when the buffer is written into the file:                                           *pkzip*     zip              PkZip  compatibility mode.    a weak encryption method.                        is compatible with  Vim 7.2  and older versions.                                            *blowfish*     blowfish          Blowfish encryption method.    Intermediate Strength encryption method But there is implementation on                        's flaws. Requires  Vim 7.3  and above, the file encrypted with it does not                        can be read by  Vim 7.2  and older versions. It will add a   "seed",                       each time you write to a file, this encrypted byte is different. 

You can set a new encryption method for a Vim file as shown below (in this case we use the Blowfish2 encryption method)

: setlocal CM=BLOWFISH2

Then type enter and: Wq to save the file.

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Setting strong encryption on Vim files

Now you should not be able to see the warning message when you open the following file again.

$ vim file.txt requires "file.txt" encryption key input encryption key: *******

You can also set a password after you open the Vim file, using the: X command to set an encryption password as shown above.

This article is from the "high-tech Library" blog, please be sure to keep this source http://gaopengju.blog.51cto.com/12830710/1947393

How to use Vim to password protect files in Linux