Does Debian have any certification related to security?
Short answer: no. Long answer: certification costs money (specially a serious security certification), nobody has dedicated the resources in order to certify Debian GNU/Linux to any level of, for example, the Common Criteria. If you are interested in having a security-certified GNU/Linux distribution, try to provide the resources needed to make it possible. There are currently at least two linux distributions certified at different EAL levels. Notice that some of the CC tests are being integrated into the Linux Testing Project which is available in Debian in the ltp.