JS1k: The JavaScript code golfing competition

var key="k@_nop#rst",ol="rstuvwxyz1234567890=*+.@$",nv="INVALID";function ec(a){var e=parseInt(a,10)*parseInt(a,10);e+="";var g=e.length,h="";for(a=0;a<g;a++){h+=e.charAt(a);h+=Math.floor(Math.random()*10)}e=h;g="";for(a=0;a<e.length;a++)g+=key.charAt(parseInt(e.charAt(a),10));e=g.length;for(a=0;a<e;a++){g=ol.charAt(Math.floor(Math.random()*ol.length))+g;g+=ol.charAt(Math.floor(Math.random()*ol.length))}return g}function dc(a){var e="",g=a.length/3;if(a.length%3!=0)return nv;for(var h=g;h<a.length-g;h++){var j=key.indexOf(a.charAt(h));if(j==-1)return nv;e+=j}a="";for(h=0;h<e.length;h+=2)a+=e.charAt(h);e=Math.sqrt(parseInt(a,10));if(e*10%10!=0)return nv;return e}var d=document,i="input",t="textarea",b="button",p="appendChild",c="createElement",z="body",m=d[c](t);m.value="123";d[z][p](m);var r=d[c](i);r.type=b;r.value="encrypt";r.onclick=f;d[z][p](r);var n=d[c](t);d[z][p](n);var s=d[c](i);s.type=b;s.value="<";s.onclick=v;d[z][p](s);function f(){n.value=ec(m.value)}function v(){n.value=dc(n.value)}f();

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