ATENEA Platform
Atenea is a cyber security solution developed by DELTA90 for the CCN-CERT, the Computer Emergency Response Team of the National Cryptologic Centre, CCN, under Spain’s National Intelligence Centre (CNI), and presents a number of challenges which cover a wide array of topics: Cryptography and Steganography , Exploiting, Forensics , Networking and Reversing , etc.
Doesn’t matter your level of knowledge, there will always be a challenge for you.