I ran a computer and network security course back from 2010-2013 and the simplified version of this was part of our wargames. The difficulty scaled with recency

I ran a computer and network security course back from 2010-2013 and the simplified version of this was part of our wargames. The difficulty scaled with recency of the last commit. Admittedly we had to minimize the number of points awarded for this as it'd be a "money for marks" conversion otherwise but it was fun enough to prove a concept. Nth commit needing N leading zeros ups the ante a fairly hilarious amount ;)