Hi All,<br><br>I am interested in developing a client-puzzle mechanism in SIP protocol so that any client wants to send an INVITE message to asterisk should solve a cryptographic puzzle first. So, anyone of you can give me pointers regarding this?<br>
<br>I am thinking about using openSSL api for the crypto in this mechanism, and I am not planning to support the clients. I just want to implement this mechanism in Asterisk and test it in mitigating DoS attacks..<br><br>
I will appreciate any help from you guys.<br><br>Fadil<br>