Instead of blocking unauthorized applications, SignaCert focuses on identifying deviations from trusted, predefined baselines of files and security configuration settings, specializing in midsize to large environments.

[ Read the Test Center review of application whitelisting solutions from Bit9, CoreTrace, Lumension, McAfee, SignaCert, and Microsoft. Compare these application whitelisting solutions by the features. ] 

SignaCert Enterprise Trust Services is composed of the SignaCert Enterprise Trust Server appliance, a huge predefined file hash database (cloud service and local), and a client that works across more operating systems (including Windows, Linux, Mac OS X, and Solaris) than any of the reviewed competitors. SignaCert even claims to work across network device platforms, such as firewalls and routers, but I didn't test that functionality. It's also the only product to monitor security configuration settings, as well as registry and file objects.

SignaCert's nonpersistent Java client is the most customizable client in this review. You can tailor its behavior based on a variety of configuration settings (to cap CPU utilization, for example). You can even build your own client to support whatever you want as long as it confirms to SignaCert's XML formatting. SignaCert easily has the best documentation of any product in this review, including hundreds of pages on both client and server components.

SignaCert comes with a vast database of predefined file hashes collected directly from the vendors. This used to be a unique feature for SignaCert, but Bit9 Parity and Lumension Application Control have followed suit. SignaCert claims to cover a wider array of platforms with its predefined file signatures than these competitors, but I did not verify this claim.

SignaCert lets you collect your own baselines using a process it calls harvesting. Unlike the baseline generation tools of many competitors, SignaCert's harvesting can easily report all file types, including the attributes of multiple hashes, location, publisher values, and even file permissions and ownership.

SignaCert collects four file hash measurements screen image -- MD5, SHA-1, SHA-256, and SHA-512 -- the most hash types of any product in this review. Like Bit9, SignaCert applies trust values on files it recognizes and includes the location and collection method when calculating the trust value, called an Authenticity score. Authenticity scores can range from 0 to 1000, with 1000 equivalent to completely trusted. SignaCert prepopulates these scores, or customers can submit their own scores for newly collected files.