THC SSL Denial Of Service Tool 1.4

THC-SSL-DOS is tool to stress test the SSL handshake by triggering processor intensive RSA_encrypt() calls on the server side. Establishing a secure SSL connection requires 15x more processing power on the server than on the client. THC-SSL-DOS exploits this asymmetric property by overloading the server and knocking it off the Internet. This problem affects all SSL implementations today. The vendors are aware of this problem since 2003 and the topic has been widely discussed. This attack further exploits the SSL secure Renegotiation feature to trigger thousands of renegotiations via a single TCP connection.