For a recent student conference, the authors developed
a day-long design problem and competition suitable for engineering,
mathematics and science undergraduates. The competition
included a cryptography problem, for which a workshop was
run during the conference. This paper describes the competition,
focusing on the cryptography problem and the workshop. Notes
from the workshop and code for the computer programs are made
available via the Internet. The results of a personal self-evaluation
(PSE) are described.