Done ticket GEPAFINBE-32

src/main/java/net/gepafin/tendermanagement/util/Utils.java

@@ -227,4 +227,10 @@ public class Utils {
 		Pattern pattern = Pattern.compile(EMAIL_REGEX);
 		return pattern.matcher(email).matches();
 	}
+
+	public static String randomKey(Integer range) {
+		String data = String.valueOf(System.currentTimeMillis());
+		return data.substring(data.length() - range);
+	}
+	
 }