they sent her chok lacolates. they sent her religious books. >> step three moves the recruit to encrypted communications. by step four the recruit is committed and isis begins to provide operational advice including this travel guide. >> it's basically everything you need to know how to get into isis territory. what you should pack. it has a checklist of ban band-aids, small l.e.d. flashlights, particularly back tack packs to bring. >> reporter: they are exploiting the digital domain to shape perceptions in their favor. and no group has been more prolific in this space. >> america's enemies are evolving. and america has to do the same. >> we have to maintain a robust set of capabilities, overhead, terrestrial, collection by aircraft, collection by humans, whatever it is. so the trick is, how do you make all the cylinders work together