Touch Data Transmission Using a Device-Specific Noise Signature

Solution Overview

Problem

Existing touch-sense systems face security vulnerabilities due to the potential interception of touch data by malicious parties, and traditional encryption methods introduce latency and resource overhead, which are undesirable in touch systems.

Innovation Solution

The method involves transmitting uncalibrated touch data from a digitizer processor to a host processor, leveraging a device-specific noise signature to secure the data without encryption, by storing a digitizer calibration map in a secure memory region of the host system to remove noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional encryption methods are used to protect touch data, then data security is improved, but processing latency and resource overhead increase

Engineering Contradiction:

Improvedata securityVSAvoidprocessing latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent converts the harmful noise signature inherent in digitizer sensors into a beneficial security feature. Instead of treating noise as interference to be eliminated, the system uses the unique noise pattern as an unbreakable encryption key, transforming a system defect into a security advantage that protects touch data without requiring traditional encryption processing

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The system uses the digitizer sensor's own inherent noise signature as its security mechanism, eliminating the need for external encryption systems. The noise signature automatically serves as the encryption key, and the calibration map stored in secure memory provides the decryption capability, making the system self-securing without additional processing overhead

Inventive Principle:

Principle #25Self-service

2Reliability

If traditional encryption methods are used to protect touch data, then data security is improved, but resource consumption increases

Engineering Contradiction:

Improvedata securityVSAvoidresource consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful noise signature inherent in digitizer sensors into a beneficial security feature. Instead of treating noise as interference to be eliminated, the system uses the unique noise pattern as an unbreakable encryption key, transforming a system defect into a security advantage that protects touch data without requiring traditional encryption processing

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The system uses the digitizer sensor's own inherent noise signature as its security mechanism, eliminating the need for external encryption systems. The noise signature automatically serves as the encryption key, and the calibration map stored in secure memory provides the decryption capability, making the system self-securing without additional processing overhead

Inventive Principle:

Principle #25Self-service

3Measurement precision

If noise signature is removed before transmission, then data quality is improved, but security is compromised

Engineering Contradiction:

Improvedata qualityVSAvoidsecurity

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system performs preliminary calibration during manufacturing to capture the noise signature and create the calibration map, which is then stored in secure memory. This preliminary action prepares the security mechanism in advance, allowing the raw touch data with noise signature to be transmitted securely without real-time processing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful noise signature inherent in digitizer sensors into a beneficial security feature. Instead of treating noise as interference to be eliminated, the system uses the unique noise pattern as an unbreakable encryption key, transforming a system defect into a security advantage that protects touch data without requiring traditional encryption processing

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentEP4672046A1Secure transmission of touch data using a device-specific calibration map

Publication Date: 2025.12.31 MICROSOFT TECHNOLOGY LICENSING LLC

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Figure 3A~3B

AI summary

A method for secure handling of touch data includes receiving touch data from a digitizer sensor in response to a user interaction with a touch surface; transmitting the touch data from a first processor of a digitizer system to a second processor of a host system without removing a noise signature of the digitizer sensor; accessing, by the second processor, a digitizer calibration map that includes the noise signature of the digitizer sensor; and substantially removing, by the second processor, the noise signature from the touch data based at least in part on the digitizer calibration map.