Ephemeral AIoT Security Context via Cryptographic Puzzle Exchange

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Solution Overview

Problem

Ambient Internet of Things (AIOT) devices, with limited processing capacity and no power storage, face challenges in establishing secure wireless communication due to complex and resource-intensive key exchange protocols, rendering conventional security methods ineffective.

Innovation Solution

A method involving a wireless transmit/receive unit (WTRU) that receives and solves cryptographic puzzles from a reader device to establish an ephemeral security context using ephemeral keys, enabling secure communication without complex processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional key exchange protocols are used to establish security context, then security is provided, but the process becomes complex and resource intensive

Engineering Contradiction:

ImprovesecurityVSAvoidcomplexity of key exchange protocol

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the security establishment process into two distinct phases: an initial provisioning phase where security parameters are pre-configured, and an operational phase where pre-configured security contexts are rapidly activated. This segmentation eliminates the need for complex real-time key exchange protocols during operational phase, reducing device complexity while maintaining security.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary action by pre-configuring multiple security contexts and parameters in the AIOT device before deployment. These pre-configured security contexts include cryptographic keys, certificates, and security policies that are ready for immediate use, eliminating the need for complex runtime key exchange protocols and reducing both computational overhead and device complexity.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If conventional key exchange protocols are used to establish security context, then security is provided, but resource consumption increases

Engineering Contradiction:

ImprovesecurityVSAvoidresource consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies local quality by optimizing the security mechanism specifically for AIOT devices with limited resources. Instead of using universal complex key exchange protocols, the system employs simplified security context activation that is tailored to the computational constraints of AIOT devices, reducing energy consumption while maintaining adequate security for ambient operations.

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If simple security mechanisms are used for AIOT devices, then resource consumption is reduced, but security strength may be compromised

Engineering Contradiction:

Improveresource consumptionVSAvoidsecurity strength

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent implements dynamics by enabling the AIOT device to dynamically select from multiple pre-configured security contexts based on the specific operational requirements and threat levels. The device can activate different security contexts with varying cryptographic strengths appropriate for different scenarios, optimizing the balance between security strength and resource consumption rather than using a fixed simple or complex security mechanism.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies parameter changes by allowing the security system to adjust cryptographic parameters such as key lengths, algorithm types, and security context selection based on operational needs. This enables the system to use stronger cryptography when security is critical and lighter cryptography when resources are constrained, dynamically optimizing the security-strength-to-resource-consumption ratio.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260052381A1Methods for establishment and use of ephemeral security between AIOT entities

Publication Date: 2026.02.19 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Systems, methods, and apparatuses for establishing an ephemeral security context between an ambient internet of things (AIOT) device and a reader device are provided herein. The reader device transmits a plurality of cryptographic puzzles and one or more puzzle parameters to the AIOT device. Each cryptographic puzzle is associated with a tuple comprising an ephemeral key and an ephemeral key index associated with the ephemeral key. The plurality of cryptographic puzzles may include reverse encryption based cryptographic puzzles and/or reverse cryptographic hash functions. The AIOT device selects and solves a cryptographic puzzle of the plurality of cryptographic puzzles and recovers the ephemeral key corresponding to the selected cryptographic puzzle. The AIOT device transmits a first message including a random device identifier and an ephemeral key index corresponding to the recovered ephemeral key. The AIOT device and the reader device establish the ephemeral security context based on the ephemeral key.