IoT Device Cryptographic Key Generation via SRAM Initialization
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Solution Overview
Problem
IoT devices without pre-manufactured cryptographic keys cannot securely communicate with servers or other devices, as they lack the necessary circuitry for generating random values required for encryption.
Innovation Solution
Generating a cryptographic key based on the unique random initialization values of the device's SRAM, using a hash function provided in a software package from the management service, which allows the device to create a secure communication key without additional circuitry for random number generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If IoT devices are manufactured without pre-stored cryptographic keys to reduce manufacturing complexity and cost, then device complexity and manufacturing cost are reduced, but the devices cannot securely communicate with servers or other devices
Solution Approach 1:
The patent applies preliminary action by utilizing the random initialization values that are automatically generated during the SRAM initialization phase before the device is put into service. These initialization values serve as the foundation for generating cryptographic keys, eliminating the need for separate random number generation circuitry while ensuring each device has unique cryptographic material from the outset.
Solution Approach 2:
The patent implements self-service by enabling devices to generate their own cryptographic keys using their unique SRAM initialization values without requiring external intervention or pre-manufactured keys. The device leverages its existing memory components to autonomously create secure communication capabilities, reducing both manufacturing complexity and the need for additional dedicated hardware.
2Reliability
If additional circuitry for random number generation is added to enable secure communication, then secure communication capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by making the SRAM serve multiple functions: it serves as both the data storage memory and the source of random values for cryptographic key generation. This multi-functionality eliminates the need for separate dedicated random number generation circuitry, reducing device complexity while maintaining secure communication capabilities.
Solution Approach 2:
The patent uses the SRAM initialization values as an intermediary element that bridges the gap between the device's existing memory components and the requirement for cryptographic randomness. These initialization values act as a mediator that enables secure communication without requiring additional specialized hardware, as they can be directly processed by the device's existing computational resources.
Data Source
AI summary
An indication of a key generation function may be received from a server. A random value may be received based on a volatile memory of a device. A cryptographic key may be generated based on the key generation function from the server and the random value that is based on the volatile memory of the device. The cryptographic key may be stored at a non-volatile memory of the device.