AES-256 encryption and HMAC-SHA256 tamper detection for Unity save files and PlayerPrefs, with a drop-in API and one-click key generation.SaveGuard contains no shaders, materials, or render-pipeline-specific assets - it's a pure C# save-encryption utility. The included demo scene uses standard Unity UI (Canvas + TextMeshPro), which renders identically under Built-in, URP, HDRP, or any custom render pipeline.SaveGuard adds AES-256 encryption and HMAC-SHA256 tamper detection to Unity save files and PlayerPrefs, so players can't open a save file in a text editor and grant themselves extra currency, unlock progress, or edit stats undetected.The API is a drop-in replacement for common patterns: SecureSaveManager.Save/Load for full save objects, and a SecurePlayerPrefs class that mirrors Unity's own PlayerPrefs for smaller values like settings and high scores. Keys are generated from a single button in a custom Inspector - no manual cryptography setup required.A Save Inspector editor window lets you view, edit, and re-sign save files directly during development, and a build-time validation check blocks accidental builds shipped without generated keys.Full C# source is included, with no external dependencies beyond TextMeshPro, which is used only by the optional demo scene UI.Honest scope: SaveGuard deters casual save-file editing. It is not a substitute for server-authoritative anti-cheat in competitive multiplayer games - no client-side package can fully stop a determined reverse-engineer, since encryption keys ship inside your build.Full documentation - setup guide, demo scene walkthrough, and script reference - is included in the package as a PDF.FeaturesAES-256-CBC encryption for save files and PlayerPrefs valuesHMAC-SHA256 integrity verification with automatic tamper detectionDrop-in SecureSaveManager.Save/Load API for full save objectsSecurePlayerPrefs API mirroring Unity's PlayerPrefsOne-click key generation from a custom InspectorSave Inspector editor window for viewing, editing, and re-signing save filesAutomatic build-time check blocking builds without generated keysOptional device-binding so a copied save file won't silently load elsewhereFull C# source includedSupported OSWindows, macOS, Linux (Editor and standalone builds), iOS, AndroidNot currently supported: WebGL (persisting writes requires an additional JS sync step not included in this version) and console platforms (PlayStation, Xbox, Switch generally require their own certified save-data APIs)Link to documentationFull documentation is bundled in the package: Documentation/SaveGuard_Documentation.pdfThe C# scripts (encryption, save/load management, PlayerPrefs wrapper, editor tools, and build validation) in this package were generated with AI assistance.
