Look up "authorship attribution" if you're interested in the identification part. There's quite a bit of research into identifying people by their unique habits

Look up "authorship attribution" if you're interested in the identification part. There's quite a bit of research into identifying people by their unique habits. Some claim that this is possible even after your code has gone through compilation or other obfuscation processes, but academics have a habit of exaggerating claims based on small data sets. I spent around a year researching this and it's a really fun field - and no doubt the non-public research and technology is as always further advanced than what we can see.