Notice of Retraction: Creating user-relationship-graph in use of flow-net and log files for computer and network accountability and forensics

[This paper has been withdrawn by the publisher]. In log files, not all information/events are recorded and it is thus impossible to trace the paths of secret leaking based on log files alone. In this paper, we utilize user-relationship-graphs, or social networks, to compensate for the required information. User-relationship-graphs are constructed from several flow-net data structures over a longer period so that we can avoid missing embedded threats such as hostile codes. We call this approach virtual flow-net.