Smart NIC WireGuard Offload Without Exposing Encryption Keys
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Solution Overview
Problem
In cloud computing environments, transferring encryption keys to a cloud service provider for hardware offloading compromises data privacy, as the provider gains access to unencrypted data, leading to slow encryption processes in software to maintain security.
Innovation Solution
Offload encryption tasks to a smart network interface controller (NIC) while maintaining encryption keys within the virtual machine, using a crypto engine and secure memory pathways to ensure data remains encrypted throughout transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If encryption keys are transferred to the cloud service provider for hardware offloading, then encryption speed is improved, but data privacy is compromised
Solution Approach 1:
The system segments the encryption architecture into distinct components: the virtual machine retains encryption keys in isolated memory, while the smart NIC contains hardware encryption engines. This segmentation allows the VM to maintain key secrecy while the NIC provides hardware-accelerated encryption, resolving the contradiction between speed and privacy by separating key management from encryption execution.
Solution Approach 2:
The smart NIC acts as an intermediary between the virtual machine and the network. It receives encrypted data from the VM, performs hardware acceleration using stored key material without exposing keys to the cloud provider, and transmits encrypted packets. This intermediary role enables fast hardware encryption while maintaining the VM's control over key secrecy, preventing the cloud provider from accessing unencrypted data.
2Object-affected harmful factors
If encryption is performed in software within the virtual machine, then data privacy is maintained, but encryption performance deteriorates
Solution Approach 1:
The system replaces software-based encryption mechanics with hardware-based encryption engines in the smart NIC. The VM continues to maintain privacy by keeping keys in software-controlled memory, while the NIC's hardware engines perform the actual encryption operations at line rate. This substitution eliminates the performance bottleneck of software encryption while preserving the privacy model through secure key isolation.
Solution Approach 2:
The smart NIC is equipped with dedicated hardware encryption engines and secure memory that autonomously perform encryption operations using key material provided by the VM. The NIC self-manages the encryption process without requiring continuous software intervention, enabling high-speed encryption while the VM retains key control. This self-service capability resolves the performance-privacy contradiction by making hardware acceleration available without compromising key management.
Data Source
AI summary
Encryption operations are securely offloaded to a network interface controller (NIC). Encryption keys are securely transferred from a virtual machine (VM) to the NIC and data is securely transferred from encrypted VM memory to secure buffers in the NIC. The NIC handles the encryption and decryption operations in hardware, greatly increasing encryption performance while not reducing security. This is especially useful in cloud server environments, so the cloud service provider does not have access to the encryption keys or the unencrypted data. The offloaded operations are performed with numerous different communication protocols, including RDMA, QUIC, IPsec underlay and WireGuard.