SDR Chip PUF Key Generation for Secure Radio
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Solution Overview
Problem
Software-defined radio (SDR) devices face security concerns due to the ability to reconfigure through software, making them vulnerable to malicious attacks that can cause radio malfunctions and interference in the RF spectrum, necessitating improved security measures for secure radio communication.
Innovation Solution
Implementing a dedicated software-defined radio chip with a physical unclonable function (PUF) that generates a shared secret key based on unique configuration data, which is used for encryption and decryption, providing an additional layer of security against cloning and ensuring secure communication between devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SDR devices use software reconfiguration for flexibility, then adaptability is improved, but security deteriorates due to vulnerability to malicious attacks
Solution Approach 1:
The patent applies preliminary action by generating secret keys in advance through the PUF mechanism during device manufacturing. The configuration data is embedded in the hardware before the device is deployed, and the PUF generates secret keys proactively rather than reactively. This preliminary key generation ensures that security credentials are already in place before any software reconfiguration occurs, preventing malicious attacks that exploit post-deployment configuration vulnerabilities.
Solution Approach 2:
The patent introduces the PUF as an intermediary between the hardware configuration data and the secret keys. The PUF acts as a mediator that transforms static configuration data into dynamic secret keys through its physical unclonable function. This intermediary layer ensures that even if software is compromised, the attacker cannot directly access the configuration data or generate valid secret keys without the PUF's physical characteristics, thus bridging hardware security with software flexibility.
2Ease of operation
If SDR chips store configuration data in memory, then ease of operation is improved, but security deteriorates due to potential exposure of secret keys
Solution Approach 1:
The patent extracts the secret key generation function from the stored configuration data by using the PUF mechanism. Instead of storing secret keys directly in memory alongside configuration data, the system separates the configuration data (which remains in memory for ease of operation) from the secret keys (which are generated on-demand by the PUF). This extraction ensures that even if memory is compromised, the configuration data alone cannot be used to derive secret keys without the PUF's physical characteristics.
Solution Approach 2:
The patent applies parameter changes by transforming the static configuration data parameter into dynamic secret keys through the PUF's physical characteristics. The PUF takes the configuration data as input and produces different output parameters (secret keys) based on its unique physical properties. This parameter transformation ensures that the same configuration data stored in memory can generate secure, unique secret keys for each device, preventing exposure through direct storage.
3Reliability
If PUF is implemented in each SDR chip, then security is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the PUF mechanism to serve multiple functions within the SDR chip. The same PUF structure that provides security against cloning also generates secret keys for encryption, authentication, and device identification. This multi-functionality reduces the need for separate security modules, thereby minimizing the increase in device complexity while maintaining high security standards.
Solution Approach 2:
The patent implements self-service by making the PUF generate secret keys autonomously from its internal configuration data and physical characteristics. The PUF does not require external key distribution or manual configuration; it self-generates the necessary security credentials based on its unique physical properties. This self-service capability simplifies the overall system architecture by eliminating the need for complex key management infrastructure, thereby reducing device complexity despite the added security functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of PUF-generated secret keys enhances security across radio frequency, waveform, data, and protocol levels, protecting radio signals and preventing unauthorized access or interference, thereby improving the overall security of SDR communication systems.
Implementation Method 1
using a physical unclonable function PUF that takes as an input configuration data and produces an output
Data Source
AI summary
A system includes two or more communication devices. Each device includes a dedicated SDR chip with a dedicated key generator to generate a secret key shared by the two SDR chips using a physical unclonable function PUF that takes as an input configuration data and produces an output. In the dedicated key generator of each SDR chip, the PUF takes as an input configuration data and produces an output identical for the two SDR chips, that is the shared secret key or a seed to derive it. The configuration data is unique to each SDR chip, dependent on physical random factors introduced during manufacture of the SDR chip, and is adapted for the respective key generator to generate the shared secret key.