Thank you. I chose the ascii data format for two reasons. One, it avoided any issues with platform specific binary storage formats, which shouldn't matter if the data is truly random, but if not could introduce bias. And secondly, I wanted it easy for everyone to see what data they were providing me, so it was clear that it wasn't a virus or such.
Feel free to use a zip or other archiving program to compress the ascii file when you email it. Thanks!