The /etc/hosts needs to be clear by early program in order to fulfill its aim. If you encrypt the file in any means, those other programs will not be able to read the file – and it will stop work .
so in short, you can not do this ( i.e. encoding ) in a meaningful manner .
however what you can do is ensure that others do not have passwords for administrative accounts on your Mac. If they do need more privileges for something, make it so that you assign access to that specific resource ( for exercise via a sudo access limited to a specific broadcast ) – and ensure that you do not give out full moon administrative access .
An example of using sudo for giving access to edit a file is to use the “ sudoedit ” option in sudo. This allows you to give another person access to edit a file without letting their editor program run as the privileged drug user ( which is bound to let them “ escape ” and allow them to other things as the privileged exploiter ). It is achieved by copying the inside file into a break localization, letting the user run their common editor program under their own exploiter id to edit that file, and then copying its contents over the privileged file afterwards.

In sudoers you would specificy something like :

username  sudoedit /etc/hosts

By default this will allow “ username ” to edit that file, and requires him to enter his own login password before doing sol .
If you want to the user to input a different password, that is not his login password, you have basically two ways of going about it.

One way is not to use “ sudoedit ” : alternatively create a custom program ( can be a shell script ) that plainly inputs a chain and checks that it matches the password you want, and then barely mimics what sudoedit does. It can besides be quite simple and equitable a “ cp ” command to copy over a specific path from the exploiter ‘s own home booklet to /etc/hosts .
The alternate is to modify which passwords sudo will accept as valid. This is done by editing /etc/pam.d/sudo and uncommenting the standard lines beginning with “ auth ”. alternatively provide the authentication module and options you want to approve.

If you want to do something wholly custom, you can compile your own PAM module that merely asks for a password and checks that it is a specific string. You can start with the source code for the default pam_opendirectory PAM faculty and just rip out the OpenDirectory parts and replace it with a simple strcmp ( ). The source code for such a custom-made faculty is very few lines of code .
You can find the pam_opendirectory PAM module reservoir code here :
hypertext transfer protocol : //opensource.apple.com/source/pam_modules/pam_modules-76/pam_opendirectory/pam_opendirectory.c.auto.html

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