This plugin modifies the form token criteria array. It adds client side values (ip address and browser agent) to the form token generator. This generates super secure form tokens, but may add issues (the 'A valid token could not be found' error message) for people who are using a pseudo-security apps which remove the user agent or people where their ISP changes their IP address frequently.
This plugin has no configuration, as it automatically adds the client side values to the array.
You need at least cpg1.5.8, as the needed plugin hook has been introduced in revision 7778.