Cryptographic Authentication via Radio Signal Challenge
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Solution Overview
Problem
The increasing complexity of mobile communication devices and the growing demand for secure and private data management in wireless communications pose challenges in effectively managing information storage and sharing, particularly in preventing unauthorized access and ensuring privacy.
Innovation Solution
A system that uses a communications device and a memory device to derive and store a random challenge from a radio signal, calculate an encrypted session key and signature, and encapsulate it with a privacy policy, allowing secure communication and data management through cryptographically authenticated protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryptographic authentication protocols are implemented to ensure security, then security and privacy protection are improved, but device complexity and computational requirements increase
Solution Approach 1:
The patent divides the cryptographic authentication system into two distinct roles: a communications device that performs complex cryptographic operations (signature calculation, encryption) and a memory device that stores authentication data and provides minimal computational support. This segmentation allows the complex security functions to be distributed to a capable device while the memory device maintains simplicity, resolving the contradiction between security requirements and device complexity.
Solution Approach 2:
The patent introduces a signature calculation unit as an intermediary component that can be located in either the communications device or the memory device. This intermediary handles the computationally intensive signature calculation operation, allowing the memory device to provide authentication functionality without requiring full cryptographic processing capabilities, thus reducing overall system complexity while maintaining security.
2Reliability
If cryptographic operations are performed to ensure secure communication, then security is improved, but power consumption increases
Solution Approach 1:
The patent segments the power-consuming cryptographic operations from the memory device to the communications device. The memory device performs only minimal operations (storing data, providing random challenges) while the communications device handles all computationally intensive tasks including signature calculation and encryption. This segmentation significantly reduces power consumption for passive memory devices while maintaining security through proper cryptographic implementation in the powered communications device.
3Reliability
If random challenges are derived from radio signals to prevent replay attacks, then security against replay attacks is improved, but measurement precision requirements increase
Solution Approach 1:
The patent implements a self-service mechanism where the radio signal itself provides the randomness needed for secure challenge generation. The memory device derives random challenges by measuring physical properties of received radio signals (such as signal strength, timing, or phase variations). This approach uses the inherent variability of wireless communication channels to generate unpredictable challenges without requiring external random number generators or high-precision measurement equipment, resolving the contradiction between security and measurement precision requirements.
Data Source
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AI summary
A system for cryptographically authenticated communication, wherein an activation signal is sent from a communications device to a memory device (410). The memory device derives a random challenge from at least one physical property of the activation signal and sends it back to the communications device (420). A signature is computed using the received random challenge (440) and sent, together with a certificate, to the memory device (450).