Update keyFinder.js

some changes is made to optimize the function

Author: winsonrich

Ciphers/keyFinder.js

@@ -2,16 +2,14 @@
 Find and retrieve the encryption key automatically 
 Note: This is a draft version, please help to modify, Thanks!
 ******************************************************/
-function keyFinder(){
- 	var result = "";
-	var key = 0;
+function keyFinder(str){ // str is used to get the input of encrypted string
+	var key = 0; // return zero means the key can not be found
 	var wordbank =["is","Is","am","Am","are","Are","have","Have","has","Has","may","May","be","Be"];
- 	var shiftNum = 0; //count the number of key shifted
-	var str = document.getElementById("encryptedID").value; //get the input string
+ 	//var shiftNum = 0; //count the number of key shifted
 	var inStr = str.toString(); //convert the input to String
 	var outStr = ""; // store the output value
- 	document.getElementById("debug").innerHTML = shiftNum; // debug: display the shifted number(s) 
- 	for (var i=0; i<26; i++){
+ 	//document.getElementById("debug").innerHTML = shiftNum; // debug: display the shifted number(s) 
+ 	for (var i=0; i<(52); i++){ //try the number of key shifted, the sum of character from a-z and A-Z is 26*2=52
 		outStr = caesarCipherEncodeAndDecodeEngine(inStr,i); // use the encrytpion engine to decrypt the input string, shiftNum=i
 		for ( var i=0; i<wordbank.length; i++){
 			if (wordbank[i] == outStr[i]+outStr[i+1]{