All SSL certs provide your website with security, but there are varying levels of it. The bigger the key, the harder it is to decode. The precise encryption value of PositiveSSL falls into the 40- to 256-bit range. Most browsers/operating systems work at 128-bit level, which is quite secure according to modern security standards. 256-bit encryption level can be reached if numerous factors match — when your site's hosting settings and your visitors' browser settings are configured to operate at 256-bit level — but this is mostly out of your control. Devices that work at only 40-bit are as extinct as triceratops (some people believe they never even existed).