BACKGROUND OF ISSUE:
I am using groovy scripting console from jenkins to enable the global security of jenkins server.
I looked around jenkins code to see if there is already a method which i can call, instead I got a function called `disableSecurity` which disables the global security, as defined here:
https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/jenkins/model/Jenkins.java#L2160

This method basically sets the boolean variable called 'useSecurity' to false.

PROBLEM :
Now I actually wanted to see if there is a method where this private bool variable `useSecurity` is set to true.
Luckily i found the method `setAuthorizationStrategy` which no matter if nothing passed to this method, will set `useSecurity` to true always whenever it gets called.
Now in my groovy script im calling it like this:

import jenkins.model.*
def inst = Jenkins.getInstance()
inst.setAuthorizationStrategy()
inst.save()

But after i run the script, my security is still disabled.
Looking at code here : https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/jenkins/model/Jenkins.java#L2148
The method defined in above link is like this:

    public void setAuthorizationStrategy(AuthorizationStrategy a) {
        if (a == null)
            a = AuthorizationStrategy.UNSECURED;
        useSecurity = true;
        authorizationStrategy = a;
    }

I see this sets the value of useSecurity to true.
but upon execution, my security yet remains disabled.

WORKAROUND NEEDED: I would like to know if im lacking understanding of this code or there are some caveats im missing.
also if someone can please suggest me a way of enabling security from groovy, would really appreciate it.

SUGGESTED SOLUTION:
defined another method like "disableSecurity", call it "enableSecurity" , and in it , set the value of boolean 'useSecurity' to true.