20 karma · joined January 25, 2013
http://www.bbsdocumentary.com/library/CONTROVERSY/LAWSUITS/S...
I just wanted to mention that this is a standard practice called rotation. After all, putting new product in front would result in wastage of the older product. Products are supposed to be culled on their sell-by (not expiration) date, and it's unfortunate that you got some bad groceries, but they didn't do anything unusual or shady.
Similarly, Safeway's practices are fairly standard amongst grocery stores, though it's a little annoying. Best to follow the sale circulars and keep your wits about you.
To answer your question directly though, it's a bit of a mix of mostly introductory concepts with the goal of introducing crypto and breaking/defensive programming to people who might not get much exposure to it. The first challenges are simple crypto-based challenges to get participants into the right frame of mind, and they culminate with exploiting a hash length extension vulnerability. Hopefully, we'd like to introduce more challenges like this in the future.