How I add Security to the smart contract?

by Mohamed Ismail   Last Updated August 14, 2018 05:28 AM

I deployed this contract and also interacted with it using ganache.

     pragma solidity ^0.4.0;
    contract Counter {
     int private count = 0;
     function incrementCounter() public {
      count += 1;
      }
      function decrementCounter() public {
    count -= 1;
      }
      function getCount() public constant returns (int) {
    return count;
      }
    }

However, when interacting with the contract, any account on Ganache can interact with it and use the function increment. How can I define only one account from Ganache to be able to change this function ?? I just wanna to add some security to the contract?

This is link for the smartcontract I follow: https://medium.com/crypto-currently/build-your-first-smart-contract-fc36a8ff50ca



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