Creating a Secure token with PHP for the Recaptcha V2

Hi all, has anyone managed to create  a secure token for the new V2 recaptcha ? In the developper's guide, it says : 1 - Prepare a token in json format     {"session_id": e6e9c56e-a7da-43b8-89fa-8e668cc0b86f,"ts_ms":1421774317718} Ok, fine ... 2 - Encrypt it with your site secret, after encryption it looks like this:     "Fg2rtWDZ6kf_Cc1fZs5xKJWnkkVvZgNCF-5fVhPS5_r1fB2NRXPg3WobIUUsyOvfN-ElyBz3zz29lK5v9NE0ByWrGzicUWecnoV8hwSb6W4" Right .... the problem is, how do you encrypt your token with your private key ? Google's guide only provides examples in Java on Github... and i've been searching on the web for a simple and neat explanation without success ... Does anyone knows a tutorial or guide for PHP users ? Mr Larry Page, if you ever read my request ( :-) ), could one of your top developper could add more information in the secure token section, that would be greatly appreciated ;-) For now, i'm keeping an eye on this post on Stackoverflow, hoping for a solution : http://bit.ly/1g4apHw -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.