Privacy data query method for smart contracts

Background and purpose:

Background: Blockchain technology faces challenges between privacy and performance. Traditional encryption technology is highly complex and has large performance loss.

Purpose: To provide a privacy data query method and device based on smart contracts, aiming to improve the security and privacy of blockchain while minimizing performance loss.

Technical solution overview:

Method: When receiving a query transaction initiated by the query party for the target privacy data, the target privacy data is finally decrypted for the query party to view by reading the transaction identifier, obtaining historical transactions, determining the business contract, and executing the permission control code.

Device: It includes a transaction reading unit, a contract determination unit, a permission query unit, and a data acquisition unit. Each unit works together to implement the above method.

Key technologies and implementation details:

Smart contract: Deploy smart contracts on the blockchain, and define business logic and permission control rules through code.

Trusted Execution Environment (TEE): The target privacy data is read into the TEE for decryption to ensure the security of data processing.

Digital envelope encryption: Query transactions and historical transactions are encrypted with digital envelopes to improve transmission security.

Permission control: According to the identity information of the query party and the historical transaction initiator, the query permission is determined through the permission control code in the business contract.

Application scenarios and advantages:

Application scenarios: Applicable to blockchain nodes, especially enterprise-level blockchain platforms, to solve the problem of private data query.

Advantages: Under the premise of small performance loss, the security and privacy of blockchain are improved to meet the dual needs of enterprises for privacy and performance.

Specific implementation methods:

Create and call smart contracts: Trigger the creation and call of smart contracts through transactions to implement the execution of business logic.

Transaction execution and recording: Blockchain nodes execute transactions and record receipt data, and obtain transaction execution results by querying transaction receipts.

Data decryption and encryption: Decrypt the target private data in TEE, and encrypt the decrypted data with the symmetric key of the query party to ensure the security of data transmission.

Summary: This document elaborates on an innovative private data query method and device based on smart contracts. Through technical means such as smart contracts, TEE and digital envelope encryption, it effectively solves the challenges of blockchain technology in privacy and performance, and provides an efficient and secure private data query solution for enterprise-level blockchain platforms.

Summary of short answer questions:

What is the name?

Answer: A method and device for querying private data based on smart contracts.

What problem does 543x.com mainly solve?

Answer: It mainly solves the balance between privacy and performance of blockchain technology, especially on enterprise-level blockchain platforms, by reducing performance loss to provide stronger privacy protection.

What is the main technical solution of 543x.com?

Answer: The technical solution includes receiving query transactions, reading transaction identifiers, obtaining historical transactions, determining business contracts, executing permission control codes, and decrypting target private data for the querying party to view, etc., which are implemented through smart contracts and trusted execution environments (TEEs).

What is a trusted execution environment (TEE)?

Answer: A trusted execution environment (TEE) is a secure area that isolates code and data at the hardware level, which can protect the confidentiality and integrity of code and data and prevent external attackers from snooping or tampering.

How is permission control implemented?

Answer: Permission control is implemented through the permission control code defined in the business contract. According to the identity information of the querying party and the initiator of historical transactions, it is determined whether the querying party has the right to view the target private data.

How is the target private data encrypted and decrypted?

Answer: The target private data is encrypted when stored and decrypted through the trusted execution environment (TEE) when queried. Query transactions and historical transactions are also encrypted with digital envelopes to ensure transmission security.

What is the application scenario of 543x.com?

Answer: 543x.com is suitable for blockchain nodes, especially enterprise-level blockchain platforms, to solve the query problem of private data.