center. >> the murphys had a box that we used to call tradecraft box, essentially a shoe box with all of their gear in it. and that made it very convenient for us. we would go there on the entries and find their notes and find their disks within this trade craft box. >> we copied anything that we thought would be of intelligence value. photographs were made of documents, files. any type of computer or electronic equipment was copied so that it could be reviewed in greater detail later. >> the murphys had been in the united states since the '90s. it was so long that the spycraft evolved from very early forms of covert communications all the way up to stenography. >> it was a system that we saw developed in the mid towels and it uses special encryption software to digitally encrypt text that's converted into a color paragraph that is then put on a web page online. and it's there for anyone to see. so you and i could go on a web