Disable back key in browser

Add this script inside head tag in html page 

<script type = "text/javascript" >

   function preventBack(){window.history.forward();}

    setTimeout("preventBack()", 0);

    window.onunload=function(){null};

</script

Disable Enter Key

<script language=javascript type=text/javascript>

function stopRKey(evt) {
   var evt = (evt) ? evt : ((event) ? event : null);
   var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
   if ((evt.keyCode == 13) && (node.type=="text")) {return false;}
}

document.onkeypress = stopRKey;

</script>