# TDX The objectives of the Intel TDX Module’s open-source initiative are to review its source code and to provide users with the capability to reproduce the official binary. To create a binary that is identical to the official release binary, it is essential to adhere to the provided [build instructions](BUILD.md). Signed binaries are available as release assets for every release and could be found [here](https://github.com/intel/tdx-module/releases). Build instructions might differ between releases - for other releases, refer to [Releases](https://github.com/intel/tdx-module/releases) page. Intel Trust Domain Extensions (TDX) introduces new architectural elements to help deploy hardware-isolated virtual machines (VMs), called Trust Domains (TDs). Intel TDX is designed to isolate VMs from the virtual-machine manager (VMM)/hypervisor and any other non-TD software on the platform to protect TDs from a broad range of software. These hardware-isolated TDs include: 1. Secure-Arbitration Mode (SEAM) – an extension to Virtual Machines Extension (VMX) architecture to define a new VMX root mode called SEAM root. This SEAM root mode is used to host a CPU-attested module to create protected virtual machines (VMs) called Trust Domains (TD). 2. Shared bit in GPA (Guest Physical Address) to help allow TD to access shared memory. 3. Secure EPT (Extended Page Table) to help translate private GPA to provide address-translation integrity and to prevent TD-code fetches from shared memory. Encryption and integrity protection of private-memory access using a TD-private key is the goal. 4. Physical-address-metadata table (PAMT) to help track page allocation, page initialization, and TLB (Translation Lookaside Buffer) consistency. 5. Multi-key, total-memory-encryption (MKTME) engine designed to provide memory encryption using AES-128- XTS and integrity using 28-bit MAC and a TD-ownership bit. 6. Remote attestation designed to provide evidence of TD executing on a genuine, Intel TDX system and its TCB (Trusted Computing Base) version. For more details, refer to https://www.intel.com/content/www/us/en/developer/tools/trust-domain-extensions/documentation.html. Please refer to the [CONTRIBUTING.md](CONTRIBUTING.md) file for guidelines on how to contribute to this repository