By default, the game may compress save files into a format that requires an extra step to decrypt. You need to force the game to save in a text-friendly binary format. Navigate to your computer's folder.
The community has developed several reliable ways to handle these files, ranging from classic executables to modern web apps.
A key "proper" behavior noted by forum users is that there is no need to manually re-encrypt files after editing; the game engine automatically reads the plain text file and re-saves it in the proper binary format upon the next save. Key Use Cases Discussed on SCS Forums sii decrypt scs forum
Some forum threads provide the static hex key: 2A 45 91 67 C3 0F 9E 4B 1D 78 A2 56 E0 33 8C 7F A simple XOR script can be applied.
Need help decrypting vehicle\truck\volvo_vnl\engine.sii By default, the game may compress save files
: A C# implementation of the original Pascal tool, designed to be more manageable for developers. Trucky's SII Decrypt-TS
Before we discuss decryption, we must understand the target. (typically short for SCS II or Structured Information Interface) is a binary or semi-encrypted data format primarily used by SCS Software —the developers behind hit simulation titles like Euro Truck Simulator 2 (ETS2) and American Truck Simulator (ATS) . The community has developed several reliable ways to
Copy SII_Decrypt.exe and paste it directly into the same folder as your target game.sii file.