zip man page,
Use password to encrypt zipfile entries (if any). THIS IS INSECURE! Many multi-user operating systems provide ways for any user to see the current command line of any other user; even
on stand-alone systems there is always the threat of over-the-shoulder peeking. Storing the plaintext password as part of a command line in an automated script is even worse. Whenever
possible, use the non-echoing, interactive prompt to enter passwords. (And where security is truly important, use strong encryption such as Pretty Good Privacy instead of the relatively
weak standard encryption provided by zipfile utilities.)
As it is mentioned in the man page, THIS IS HIGHLY INSECURE!
So, you can try the below, From the
zip man page again,
Encrypt the contents of the zip archive using a password which is entered on the terminal in response to a prompt (this will not be echoed; if standard error is not a tty, zip will exit
with an error). The password prompt is repeated to save the user from typing errors.
The command goes something like,
zip --encrypt foo.zip foo.txt which asks for password on terminal,
updating: foo.txt (stored 0%)
WARNING: The encryption used by
zip is not really a strong one. It can be cracked easily!