diff options
Diffstat (limited to 'runtime/doc/usr_23.txt')
| -rw-r--r-- | runtime/doc/usr_23.txt | 96 |
1 files changed, 6 insertions, 90 deletions
diff --git a/runtime/doc/usr_23.txt b/runtime/doc/usr_23.txt index 63cbc612de..0578a63ae5 100644 --- a/runtime/doc/usr_23.txt +++ b/runtime/doc/usr_23.txt @@ -6,15 +6,13 @@ This chapter is about editing files that are not ordinary files. With Vim you -can edit files that are compressed or encrypted. Some files need to be -accessed over the internet. With some restrictions, binary files can be -edited as well. +can edit files that are compressed. Some files need to be accessed over the +internet. With some restrictions, binary files can be edited as well. |23.1| DOS, Mac and Unix files |23.2| Files on the internet -|23.3| Encryption -|23.4| Binary files -|23.5| Compressed files +|23.3| Binary files +|23.4| Compressed files Next chapter: |usr_24.txt| Inserting quickly Previous chapter: |usr_22.txt| Finding the file to edit @@ -154,89 +152,7 @@ http://. For more information, also about passwords, see |netrw|. ============================================================================== -*23.3* Encryption - -Some information you prefer to keep to yourself. For example, when writing -a test on a computer that students also use. You don't want clever students -to figure out a way to read the questions before the exam starts. Vim can -encrypt the file for you, which gives you some protection. - To start editing a new file with encryption, use the "-x" argument to start -Vim. Example: > - - vim -x exam.txt - -Vim prompts you for a key used for encrypting and decrypting the file: - - Enter encryption key: ~ - -Carefully type the secret key now. You cannot see the characters you type, -they will be replaced by stars. To avoid the situation that a typing mistake -will cause trouble, Vim asks you to enter the key again: - - Enter same key again: ~ - -You can now edit this file normally and put in all your secrets. When you -finish editing the file and tell Vim to exit, the file is encrypted and -written. - When you edit the file with Vim, it will ask you to enter the same key -again. You don't need to use the "-x" argument. You can also use the normal -":edit" command. Vim adds a magic string to the file by which it recognizes -that the file was encrypted. - If you try to view this file using another program, all you get is garbage. -Also, if you edit the file with Vim and enter the wrong key, you get garbage. -Vim does not have a mechanism to check if the key is the right one (this makes -it much harder to break the key). - - -SWITCHING ENCRYPTION ON AND OFF - -To disable the encryption of a file, set the 'key' option to an empty string: -> - :set key= - -The next time you write the file this will be done without encryption. - Setting the 'key' option to enable encryption is not a good idea, because -the password appears in the clear. Anyone shoulder-surfing can read your -password. - To avoid this problem, the ":X" command was created. It asks you for an -encryption key, just like the "-x" argument did: > - - :X - Enter encryption key: ****** - Enter same key again: ****** - - -LIMITS ON ENCRYPTION - -The encryption algorithm used by Vim is weak. It is good enough to keep out -the casual prowler, but not good enough to keep out a cryptology expert with -lots of time on his hands. Also you should be aware that the swap file is not -encrypted; so while you are editing, people with superuser privileges can read -the unencrypted text from this file. - One way to avoid letting people read your swap file is to avoid using one. -If the -n argument is supplied on the command line, no swap file is used -(instead, Vim puts everything in memory). For example, to edit the encrypted -file "file.txt" without a swap file use the following command: > - - vim -x -n file.txt - -When already editing a file, the swapfile can be disabled with: > - - :setlocal noswapfile - -Since there is no swapfile, recovery will be impossible. Save the file a bit -more often to avoid the risk of losing your changes. - -While the file is in memory, it is in plain text. Anyone with privilege can -look in the editor's memory and discover the contents of the file. - If you use a viminfo file, be aware that the contents of text registers are -written out in the clear as well. - If you really want to secure the contents of a file, edit it only on a -portable computer not connected to a network, use good encryption tools, and -keep the computer locked up in a big safe when not in use. - -============================================================================== -*23.4* Binary files +*23.3* Binary files You can edit binary files with Vim. Vim wasn't really made for this, thus there are a few restrictions. But you can read a file, change a character and @@ -322,7 +238,7 @@ the right are ignored. See the manual page of xxd for more information. ============================================================================== -*23.5* Compressed files +*23.4* Compressed files This is easy: You can edit a compressed file just like any other file. The "gzip" plugin takes care of decompressing the file when you edit it. And |