I work as an IT Security Consultant at T-Systems International GmbH / Telekom Security in Germany and I write about IT Security related topics.
The crackthe.net domain is not for sale. I've used this domain name since March 2010 as both my personal domain and originally for quite a few projects I was involved with. Even though most of those projects have spun off into different domains of their own now, I'm still pretty attached to crackthe.net as my personal domain.
If you have any questions, don't hesitate to get in touch: firstname.lastname@example.org, XING or LinkedIn. You can also follow me on Twitter.