CryptOMG is CTF-style testbed for exploiting various flaws in cryptographic implementations. Cryptography is very easy to do incorrectly, which is pretty apparent throughout the web if you know what to look for. CryptOMG will help train your eye to look out for the common flaws such as cryptographic oracles and offers a safe environment for practicing exploitation. Most challenges were designed to be cipher independent and to illustrate this, configuration options are provided to change the algorithm and encoding that is being used.
Cool Stuff Includes:
CryptOMG is available on the SpiderLabs GitHub.