Layer 2 Encryption for Embedded Nodes
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Solution Overview
Problem
In massive embedded deployments, the processing overhead of implementing typical network security measures like IPSec makes it impractical due to limited processing resources, necessitating a more efficient method for secure network communications.
Innovation Solution
A system and method utilizing Layer 2 encryption that is transparent to embedded nodes, where data messages are encrypted at one end point device and decrypted at another, forming a secure communications link between two networks without modifying IP-layer network information, using an encryption controller and storage for key management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If typical network security measures like IPSec are implemented, then security is improved, but processing overhead increases making it impractical for embedded devices
Solution Approach 1:
The patent introduces an intermediary encryption device that sits between embedded nodes and the network. This mediator handles all encryption and decryption operations, while embedded nodes simply send and receive data without performing security functions. The intermediary device performs Layer 2 encryption on outgoing packets and decrypts incoming packets, completely offloading the security processing burden from resource-constrained embedded devices.
Solution Approach 2:
The patent replaces the traditional IPSec approach (which requires complex cryptographic processing at each network node) with a Layer 2 encryption mechanism. Instead of having each embedded node perform IP-layer security operations, the system substitutes this with data link layer encryption that is handled by a dedicated encryption device, significantly reducing the computational burden on embedded processors.
2Reliability
If encryption is implemented at the embedded node, then security is improved, but device complexity increases
Solution Approach 1:
The patent extracts the encryption functionality from the embedded nodes and places it in a separate, dedicated encryption device. Embedded nodes no longer contain encryption hardware or software; instead, they simply transmit plaintext data to the encryption device, which handles all security operations. This separation removes security-related complexity from embedded devices while maintaining strong encryption.
Solution Approach 2:
The encryption device acts as an intermediary that embedded nodes communicate with for security operations. Rather than embedding complex cryptographic engines in each node, the intermediary handles key management, encryption, and decryption centrally, simplifying the embedded device architecture while maintaining security.
3Productivity
If Layer 2 encryption is used, then processing overhead is reduced, but network compatibility may be affected
Solution Approach 1:
The patent changes the operational layer from IP-layer (Layer 3) encryption to data link layer (Layer 2) encryption. This parameter change in the OSI model layer provides several advantages: Layer 2 encryption operates on MAC addresses rather than IP addresses, is transparent to network layer protocols, and requires minimal modification to existing network infrastructure. The encryption device transparently encrypts all traffic passing through it without requiring changes to embedded nodes or network protocols.
Data Source
AI summary
A method includes receiving a data message, from a first embedded node, in a first end point device. The first data message is addressed to a second embedded node. The method also includes encrypting the first data message to produce an encrypted data message, where the encryption is transparent to the first embedded node. The method further includes transmitting the encrypted data message to a second end point device. An apparatus includes a plurality of embedded node ports each configured to communicate with an embedded node. The apparatus also includes an encrypted communications link port configured to communicate with an end point device. The apparatus further includes a controller connected to communicate with the embedded node ports and the encrypted communications link port. In addition, the apparatus includes a storage connected to be read from and written to by the controller.