SII Decrypt tool is a staple in the SCS Software modding community for Euro Truck Simulator 2 (ETS2) and American Truck Simulator (ATS). It allows players to decode and edit encrypted files, primarily game saves ( ), which are otherwise unreadable in standard text editors. Key Decryption Tools & Methods SII_Decrypt (Original Utility)
The game offers a configuration variable known as g_save_format . While setting this variable to "2" theoretically instructs the game to produce a text-based save, the data is often still scrambled or compressed. As user Steve Pitts explained on the forum, "The saved games are always encrypted whether they are text format or not".
Example: /def/vehicle/truck/volvo.fh16/engine_d13k500.sii inside a packed .scs archive. Extract the archive using official SCS Extractor. sii decrypt scs forum
The ability to decrypt SII files has unlocked a world of possibilities, from simple single-player save edits to complex truck mods and community map projects. The journey from the original Pascal-based SII_Decrypt to modern, cross-platform tools like the web-based SII Decode Online and Rust-based DecryptTruck is a testament to the enduring passion and technical creativity of the ETS2 and ATS modding scene.
Before attempting to decrypt, ensure your game is set up to generate the appropriate data. Open the config.cfg file located in the same directory as your profiles. Locate the line uset g_save_format and ensure it is set to "2" or "3" to encourage the game to produce a text-like output, though decryption will still be required. SII Decrypt tool is a staple in the
Use the forum search bar to look for the thread.
Go to Documents \ [Euro Truck Simulator 2 or American Truck Simulator] \ profiles \ [Your Profile ID] \ save \ [Slot Number] . While setting this variable to "2" theoretically instructs
Let’s get technical. Based on hundreds of forum posts, the SII encryption isn't military-grade AES. Instead, it uses a combined with a simple compression step (often LZ4 or a custom variant).
Open Command Prompt or Terminal in that folder. Run:
But what exactly does "SII Decrypt" mean? Why is the the central hub for this knowledge? And how can you leverage these community-driven discoveries to unlock encrypted data?