Securing Symmetric Encryption Based on Substitution-Permutation Network Against White-Box Attacks

This paper addresses white-box attacks (scenarios where attackers can see all the inner workings of an encryption system and control the computer it runs on), which are harder to defend against than black-box attacks (where attackers cannot see the implementation). The authors propose a new method to protect symmetric encryption algorithms that use substitution-permutation networks (a common encryption structure that substitutes and rearranges data) by adding secret components to lookup tables, making the encryption stronger without changing the final encrypted message.