This report presents the results from the project Strid i IT-domänen (Warfare in the IT domain). The main part of the work has been done in the intrusion analysis field. A method called Oscar to identify the file type of data fragments has been developed. The possibility to use more technically oriented scenarios within the Defence Forces has been studied. There has also been a study of how software to erase the contents of hard disks handles the ATA standard. The result shows that the softwares studied did not fully comply to the standard, hence they cannot be guaranteed to be able to erase all information on a hard disk.