Nathan Reboud nreboud

## GreHack2019_CTF_challenge.md

      
        
          
            
              
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              June 21, 2024 04:10
            
              
                GreHack2019 CTF challenge - White-box
              
          
        
      
        
  
      
    GreHack2019 CTF challenge

One of the challenges of the GreHack2019 CTF was a white-box.
The White-box has been pushed to the SideChannelMarvels Project.
1. White-box? What is that?

White-box cryptography is presented here : http://www.whiteboxcrypto.com/. If you are not fammilair with the concept, Brecht Wyseur itroduced it well in "white-box cryptography: hiding keys in software", MISC magazine, April 2012
2. GreHack2019 White-box

The GreHack2019 CTF white-box is very classic AES128 white-box implementation. The fact that it implements an AES can be found by having a look to the code and by identifying the 11 rounds or by simply looking to the input sample "Who Is Rijndael".