Browser Cryptography Sandbox for Secure Key Integrity

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Solution Overview

Problem

Conventional cryptographic services in browser software are vulnerable to attacks, making users and servers hesitant to share secure keys due to untrusted execution environments, which compromises the integrity of cryptographic implementations.

Innovation Solution

Implementing trusted credential and key management services within a sandboxed area of the browser software using a trusted service as a root-of-trust, employing cryptographic techniques like white-box cryptography to protect secure keys and ensure their integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If cryptographic services are implemented within browser software, then cryptographic operations can be performed in the client system, but the security and integrity of cryptographic keys are compromised due to untrusted execution environments

Engineering Contradiction:

Improvecryptographic operationsVSAvoidkey integrity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system segments the cryptographic environment by creating a sandboxed execution area within the browser software. This sandbox isolates the cryptographic operations from the untrusted browser environment, allowing cryptographic functions to be performed while protecting key integrity through environmental separation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A trusted service acts as an intermediary between the untrusted browser software and the cryptographic operations. This trusted service verifies and protects cryptographic keys, mediating all interactions to ensure key integrity while enabling cryptographic functionality within the browser.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If secure keys are shared with browser software, then cryptographic functionality is enabled, but the keys become vulnerable to attacks from untrusted servers or communication channels

Engineering Contradiction:

Improvecryptographic functionalityVSAvoidkey vulnerability

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The system applies preliminary protective measures by sandboxing the browser software before cryptographic keys are introduced. This pre-established secure environment prevents potential attacks from compromising the keys, countering harmful factors before they can affect the cryptographic functionality.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The sandboxed execution area serves as a protective cushion between the untrusted browser environment and the cryptographic keys. This预先建立的防护层 absorbs and neutralizes potential attacks, allowing cryptographic functionality to operate securely despite the untrusted external environment.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If a sandboxed area is created within browser software, then key protection is improved, but the system complexity increases

Engineering Contradiction:

Improvekey protectionVSAvoidsystem structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sandboxed execution area is merged within the existing browser software architecture rather than being a completely separate system. This integration approach provides key protection through sandboxing while minimizing the increase in overall system complexity by reusing existing browser components and structures.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250358265A1Cryptographic systems and methods

Publication Date: 2025.11.20 INTERTRUST TECH CORP

AI summary

Systems and methods are described that use cryptographic techniques to improve the security of applications executing in a potentially untrusted environment associated with a software application. Embodiments of the disclosed systems and methods may, among other things, facilitate cryptographic operations within an execution environment associated with browser software of a client system while maintaining security of cryptographic keys imported into the environment. As the security of keys is maintained in an execution environment implementing embodiments of the disclosed systems and methods, users and/or systems may be more willing to consign their keys for use in connection with cryptographic operations performed in such environments.