You are welcome to link to this site using this banner. Simply copy this HTML-code to your page:
<a href="http://teppo.tv/cryptogram/"><img src="http://teppo.tv/cryptogram/crypto392x72.gif" width="392" height="72" alt=""></a>
When you use this code, you don't need to copy the graphic to your site. If you really want to, you can do that too.
Using textual links is just as fine, perhaps using an address that is given to you when you create your own cryptogram.