How would I transfer these into PlayerPrefs?

So right now the high score is being saved to a file thats easily editable by the player. That isnt really secure for a high score. How do I make it so that insted of the OurFile stuff, it just saves the value and then posts it? Im a playerprefs noob and anything helps, thanks.

(JAVA) Score load: import System.IO;

 var fileName = "hs.data";
 var ScoreLoad : String;
 var HighScoreDisplay : GameObject;
 
 var line : String;
 
 static var CompareScore : int;
 
 function Start(){
     var sr : StreamReader = new StreamReader(fileName);
 
     line = sr.ReadLine();
     while (line != null){
         ScoreLoad = line;
         line = sr.ReadLine();
 
     }
     sr.Close();
 
     HighScoreDisplay.GetComponent.<Text>().text = "" + ScoreLoad;
 
     CompareScore = int.Parse(ScoreLoad);
 }

and Score Save (java): import System.IO;

 var fileName = "hs.data";
 var ScoreAmount : int;
 
 var HighScore : int;
 
 function Start (){
     HighScore = ScoreLoad.CompareScore;
     ScoreAmount = GlobalScore.CurrentScore;
     if (ScoreAmount >= HighScore){
         var OurFile = File.CreateText(fileName);
         OurFile.WriteLine (ScoreAmount);
         OurFile.Close();
     }
 }