How do I create an encrypted (password protected) zip file?
This will prompt for a password:
zip --encrypt file.zip files
This is more insecure, as the password is entered/shown as plain text:
zip --password (password) file.zip files
Warning, the standard zip encryption is very weak and is easily cracked.
-r to zip directory and subdirectory recursively.
You can also right-click on a folder or file(s) in Nautilus and select "Compress...". In the resulting window, you can expand the "Other Options" section to enter a password.
If the password field or any of the other options are not enabled, then the selected compression option does not support it. Select a different one from the list after the filename. According to the documentation:
Currently, only 7-Zip, ZIP, RAR and ARJ archives support encryption
Comments and answers have mentioned the default zip encryption is weak, but since there is no code example, here is on with .7zip:
sudo apt-get install p7zip-full # install 7zip 7za a -tzip -p -mem=AES256 foo_file.zip foo_folder # encrypt folder
7za: Use 7zip
a: Append? / Adding files? (
-tzip: Use .zip format instead of default .7z
-mem=AES256: Use AES256 encryption
foo_file.zip: Name of .zip file
foo_folder: Name of folder to encrypt
Answer based on: https://www.tecmint.com/7zip-command-examples-in-linux/
sudo apt-get install zip zip -r --encrypt result.zip folder
- Install zip
-rto zip directory and subdirectory
--encryptto secure your files
with a simple password-based symmetric encryption system, which is documented in the ZIP specification
a_file, creating the encrypted archive
encrypted.zip (you'll be prompted for a password):
bsdtar --options zip:encryption -acf encrypted.zip a_file
Decrypt and extract the file from the encrypted archive:
bsdtar -xf encrypted.zip
-a option when creating the archive makes bsdtar choose the archive format and its compression using the ending of the archive,
.zip. If you don't add
-a, you'll get this error message:
bsdtar: Unknown module name: `zip'
The metadata (filenames) of an encrypted zip can be read with
The solution, as described in that link is to double-zip it but it is really not elegant.
Also, some email providers block that kind of attachment, gmail for example.