var bifidEncode, bifidDecode;
// Assign closures that have access to the table
(function(){
	// Generate the encryption table
	/* * * * * * * * *
	 *   1 2 3 4 5 6 *
	 * 1 A B C D E F *
	 * 2 G H I J K L *
	 * 3 M N O P Q R *
	 * 4 S T U V W X *
	 * 5 Y Z 0 1 2 3 *
	 * 6 4 5 6 7 8 9 *
	 * * * * * * * * */
	var _table = (function(){
		var result = {};
		var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
		for (var i = 0; i < chars.length; i += 1) {
			var c         = chars.charAt(i);
			var index     = Math.floor( i / 6 ).toString() + ( i % 6 ).toString();
			result[c]     = index;
			result[index] = c;
		}
		return result;
	})();
	
	bifidEncode = function( rawText ) {
		var rawIndices = "";
		for( var i = 0; i < rawText.length; i++ ) {
			rawIndices += _table[rawText.charAt( i )];
		}
		// cipherIndices = rawIndices[::2] + rawIndices[1::2]
		var cipherIndices = "";
		for( var i = 0; i < rawIndices.length; i += 2 ) {
			cipherIndices += rawIndices.charAt( i );
		}
		for( var i = 1; i < rawIndices.length; i += 2 ) {
			cipherIndices += rawIndices.charAt( i );
		}
		var cipherText = "";
		for( var i = 0; i < cipherIndices.length; i += 2 ) {
			cipherText += _table[cipherIndices.substr( i, 2 )];
		}
		return cipherText;
	};
	
	bifidDecode = function( cipherText ) {
		var cipherIndices = "";
		for( var i = 0; i < cipherText.length; i++ ) {
			cipherIndices += _table[cipherText.charAt( i )];
		}
		var rawIndices = "";
		for( var i = 0; i < cipherText.length; i++ ) {
			rawIndices += cipherIndices[i];
			rawIndices += cipherIndices[i + cipherText.length];
		}
		var rawText = "";
		for( var i = 0; i < rawIndices.length; i += 2 ) {
			rawText += _table[rawIndices.substr( i, 2 )];
		}
		return rawText;
	};
})();