Smart NIC Encryption Offload Without Cloud Key Exposure
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Solution Overview
Problem
In cloud server environments, maintaining data privacy and security while achieving high-speed encryption is challenging due to the need for cloud service providers to access encryption keys, which compromises data secrecy when hardware offloading is employed.
Innovation Solution
Offloading encryption tasks to a smart network interface controller (NIC) while maintaining encryption keys within the virtual machine, using a secure architecture that encrypts data transfers between the VM memory and the NIC, ensuring that only the VM can decrypt the data, thus preventing the cloud service provider from accessing unencrypted data.
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 and secrecy are 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 performs encryption operations. This segmentation allows hardware acceleration without key exposure to the cloud service provider, resolving the contradiction between speed and privacy.
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, and transmits data without the cloud service provider ever accessing the encryption keys. This intermediary role enables speed improvement while maintaining privacy.
2Object-affected harmful factors
If encryption is performed in software within the virtual machine, then data control and privacy are maintained, but encryption performance is slow
Solution Approach 1:
The smart NIC serves as a specialized intermediary that handles the computationally intensive encryption tasks through hardware acceleration. The virtual machine maintains control of keys and data, while the smart NIC provides the performance boost needed for practical deployment.
Solution Approach 2:
The patent replaces software-based encryption mechanisms with hardware-based encryption in the smart NIC. This substitution maintains the security model where the VM controls keys, while dramatically improving performance through dedicated hardware acceleration.
3Object-affected harmful factors
If encryption keys are maintained in the virtual machine, then data secrecy is preserved, but hardware offloading cannot occur
Solution Approach 1:
The architecture segments key management from encryption execution. The virtual machine maintains encryption keys in protected memory, while the smart NIC performs encryption operations using these keys without the cloud service provider gaining access. This segmentation enables both secrecy preservation and hardware offloading.
Solution Approach 2:
The smart NIC intermediary enables the VM to maintain key control while still achieving hardware offloading. The smart NIC receives encrypted data from the VM, performs acceleration, and returns results without the cloud service provider needing to access the keys, thus enabling both goals simultaneously.
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.