The guys over at Matasano have made a set of 48 challenges (split over 6 sets) that show attacks on real-world crypto. Sets 7 and 8 were added later, btw, by them.
This repository contains solutions to the challenges (as well as the challenge statements), as and when I solve them.
I had started another repository earlier, but a whole bunch of that code is badly written, and I decided to start over from scratch.
Each of the sets contain solutions in the #.py files (Python 2.7), as well as the questions in the README.md of the appropriate directory. You can jump to a solution by clicking on the heading of any of the challenges.
Additionally the sets each have a common.py file, which contains code that is re-used in that set. Different sets can have extremely different common.py files, and need not be subset/superset of each other.
All code in this repository is covered under the MIT License.
The questions are taken from cryptopals.com. No infringement is intended.