Na página zip
man,
-P password
--password password
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.)
Como é mencionado na página man, ISTO É ALTAMENTE INSECURE!
Então, você pode tentar o seguinte, da página zip
man novamente,
--encrypt
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.
O comando é algo como
zip --encrypt foo.zip foo.txt
que solicita senha no terminal,
Enter password:
Verify password:
updating: foo.txt (stored 0%)
AVISO: A criptografia usada por zip
não é realmente strong. Pode ser quebrado facilmente!