Trusted Execution Environments (TEEs) are the foundational hardware technology of confidential computing — and in 2026 enterprises must choose between three competing architectures: Intel TDX, AMD SEV-SNP, and ARM TrustZone. Each offers different security guarantees, deployment models, performance overheads, and cloud support. This technical comparison helps enterprise architects select the right TEE technology for their specific confidential computing requirements.
What Are Trusted Execution Environments?
A Trusted Execution Environment is a secure, isolated region of a processor where code and data are protected from access by all other software, including the operating system, hypervisor, and other applications. TEEs use hardware-enforced memory encryption and access controls to guarantee that even the cloud provider or system administrator cannot access the data being processed inside the TEE.
Intel TDX vs AMD SEV-SNP vs ARM TrustZone: Technical Comparison
| Property | Intel TDX | AMD SEV-SNP | ARM TrustZone |
|---|---|---|---|
| Protection granularity | Full VM (Trust Domain) | Full VM (encrypted virtual machine) | CPU partition (Secure World vs Normal World) |
| Memory encryption key | Per-TD hardware key, managed by Intel TDX Module | Per-VM hardware key, managed by AMD Secure Processor | Security State partition — no memory encryption in standard TrustZone |
| Memory integrity | Yes — detects memory tampering via integrity trees | Yes (SNP adds memory integrity over SEV and SEV-ES) | Limited — depends on SoC implementation |
| Migration support | Live migration with attestation (Intel TDX 1.5) | Live migration available (SEV-SNP) | Not applicable — device-bound |
| Performance overhead | 5–10% for VM-level workloads | 3–8% for most workloads | Context switch overhead (~1000 cycles) |
| Cloud support 2026 | Google Cloud C3 machines, Azure preview, Alibaba | AWS Nitro Enclaves, Azure Confidential VMs, GCP | All ARM-based mobile and IoT devices, AWS Graviton |
| Best use case | Lift-and-shift confidential VMs — minimal code change required | Large VM workloads — databases, ML training | Mobile and IoT — key storage, DRM, biometric processing |
Intel TDX: Deep Dive
Intel Trust Domain Extensions (TDX) creates hardware-isolated virtual machines called Trust Domains (TDs). Unlike Intel SGX (which required application-level code changes), TDX protects entire VMs with minimal application modifications — making it the most practical TEE for lift-and-shift of existing enterprise workloads.
AMD SEV-SNP: Deep Dive
AMD Secure Encrypted Virtualization with Secure Nested Paging (SEV-SNP) encrypts individual virtual machines using per-VM keys managed by the AMD Secure Processor. The SNP addition (over SEV and SEV-ES) adds memory integrity protection — critical for production security, as memory tampering attacks were practical against SEV-only deployments.
ARM TrustZone: Deep Dive
ARM TrustZone partitions the CPU into two execution states: the Secure World (trusted code and data) and the Normal World (standard OS and applications). Unlike TDX and SEV-SNP, TrustZone is not a VM-level TEE but a CPU-level partition — making it ideal for mobile devices, IoT hardware, and embedded systems where it protects key storage, biometric processing, and DRM operations.
Enterprise TEE Selection Guide
TEE selection is one component of a confidential computing architecture that also requires attestation service design, secure key management, and integration with existing DevOps and development workflows. Our teams design end-to-end confidential computing architectures for regulated enterprise workloads. Book a free advisory session to scope your confidential computing requirements.