Virtual TPM Authentication Across Enterprise VM Clusters
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Solution Overview
Problem
Existing virtualized enterprise environments face challenges in securely authenticating users across multiple virtual machines and servers due to the limitations of hardware-based Trusted Platform Modules (TPMs), which hinder efficient key management and encryption processes.
Innovation Solution
Implementing a virtual Trusted Platform Module (vTPM) system that utilizes a shared enterprise key across all vTPMs, enabling secure encryption and decryption of user keys within the hypervisor's protection, allowing seamless authentication across all servers and virtual machines in an enterprise cluster.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardware-based TPMs are used in virtualized environments, then security of individual VMs is improved, but key management efficiency and scalability deteriorate
Solution Approach 1:
The patent merges multiple hardware TPM instances into a single shared TPM resource that serves the entire virtualized environment. The TPM device is accessed by the hypervisor, which manages cryptographic operations for multiple VMs, eliminating the need for separate hardware TPMs in each VM while maintaining security standards.
Solution Approach 2:
The shared TPM device performs multiple cryptographic functions for multiple different VMs and users. It generates, stores, and manages encryption keys for various VMs, provides authentication services across different virtual machines, and handles cryptographic operations universally for the entire virtualized infrastructure.
2Reliability
If hardware-based TPMs are allocated to each VM, then individual VM security is improved, but system complexity and resource overhead increase
Solution Approach 1:
Multiple TPM functions and key management capabilities are merged into a single shared TPM device managed by the hypervisor. This consolidation reduces the number of hardware components needed while maintaining the security protections that would otherwise require separate hardware TPMs for each VM.
Solution Approach 2:
The hypervisor acts as an intermediary between the shared TPM device and multiple VMs. It manages cryptographic operations, handles key generation and storage, and provides authentication services to different VMs without requiring each VM to have its own dedicated TPM hardware.
3Reliability
If separate TPMs are used for each appliance, then cryptographic operations are secure, but authentication efficiency across multiple appliances deteriorates
Solution Approach 1:
The shared TPM device provides universal cryptographic services to multiple appliances within the virtualized environment. It handles key generation, encryption, decryption, and authentication operations for different VMs and users, enabling efficient cross-appliance authentication while maintaining cryptographic security standards.
Solution Approach 2:
The hypervisor serves as an intermediary that coordinates cryptographic operations between the shared TPM and multiple appliances. It manages the authentication process across different VMs, allowing users to authenticate efficiently across multiple appliances while the TPM provides secure cryptographic operations.
Data Source
AI summary
Disclosed is a system and method for enterprise authentication. An enterprise cluster includes one or more enterprise appliances employing virtual machines managed by at least one hypervisor. Each virtual machine is associated with a respective virtual Trusted Platform Module (vTPM) secured by the hypervisor. An enterprise key (EK) is provided to the appliances of the enterprise cluster and imported into a vTPM associated with each appliance. When a user authentication request is received by a first appliance, the first appliance obtains a user encrypted key which was previously encrypted by a different vTPM on a different appliance with the same EK. The vTPM then signs a challenge based on decrypting the user encrypted key with the EK, completing the user authentication request.