you can prob. write something like this yourself fairly quickly in java. All it would have to so is use something like stringTokenizer and you can set it to keep like every five charactors or something like that. (whatever you would want for the cypher) If you dont program I'm not familiar with a program that does this offhand. I'm sure someone has writen one similar though. And if you want help to write something like this let me know and ill help you out.