Blockchain Information Transaction with Encrypted Ledger

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Solution Overview

Problem

When information is registered in a blockchain, it becomes public, allowing any user to acquire the information without a recorded history, leading to potential misuse.

Innovation Solution

An information transaction method that involves an information provider terminal, an information user terminal, and authentication server devices, where information is encrypted and transaction data is written to a distributed ledger, ensuring that information can only be acquired after a history is recorded.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If information is registered in a blockchain, then transparency and accessibility are improved, but security and control over information distribution deteriorate

Engineering Contradiction:

Improveinformation accessibilityVSAvoidinformation distribution control

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The system performs preliminary actions by generating encrypted information before registration, and recording both the encryption key and encrypted information in the blockchain. This preliminary encryption step ensures that while information is accessible on-chain, it remains controlled and secure until proper decryption occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary mechanism using encrypted information and separate key management. The encrypted information acts as a mediator between the original information and the blockchain, allowing transparency while maintaining control through the separation of information and decryption keys.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If encryption is applied to information before registration, then security is improved, but information utility and accessibility deteriorate

Engineering Contradiction:

Improveinformation securityVSAvoidinformation utility

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The system segments information into two separate components: the encryption key and the encrypted information. Both are registered in the blockchain separately, allowing the information to remain secure while maintaining full utility when the key and encrypted data are combined for decryption.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter state of information from plaintext to encrypted form, while simultaneously managing the encryption key as a separate controllable parameter. This allows the information to maintain security through encryption while preserving utility through key-based decryption capabilities.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12307445B2Information transaction method, information user terminal, and recording medium

Publication Date: 2025.05.20 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

An information transaction method of the present disclosure includes an information providing phase of providing, by an information provider, information requested by an information user via a distributed ledger of authentication server devices. In the information providing phase, an information provider terminal acquires first transaction data including an information user ID, an information provider ID, and a second information index indicating an index of first information requested by the information user among information items indicated by the first information index published in the distributed ledger, the first transaction data being written in the distributed ledger. The information provider terminal generates first encrypted information by encrypting the first information designated by the second information index, generates second transaction data including the information provider ID, the information user ID, and the first encrypted information, and transmits the second transaction data to an authentication server device.