Cross-Device Data Transmission Using Fixed-Length Digest Verification
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Solution Overview
Problem
In smart office scenarios, ensuring the security and integrity of files transmitted between different terminals during smart meetings is a pressing technical challenge, as traditional methods fail to provide adequate protection against data tampering or loss.
Innovation Solution
A cross-device data transmission method and system that uses fixed-length encrypted digest information, calculated via a message digest algorithm, to verify the integrity of data transmitted between terminals, establishing a secure communication connection through WIFI or socket channels based on UDP or TCP protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data is transmitted directly between terminals without verification, then transmission speed is improved, but data security and integrity deteriorate
Solution Approach 1:
The patent applies preliminary action by calculating the digest information of the data to be transmitted before actual transmission occurs. The first terminal computes the digest of the original data, encrypts it with the private key to generate signature information, and transmits this signature along with the encrypted data. This pre-computation and pre-transmission of verification information ensures that when data arrives at the second terminal, verification can immediately occur without delaying the overall transmission process, thus maintaining high speed while ensuring security and integrity.
2Reliability
If digest verification is implemented, then data integrity is improved, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism using cryptographic digest information and digital signatures to verify data integrity. Instead of complex direct verification between terminals, the system uses a mathematical intermediary (the digest hash and signature) that simplifies the verification process. The first terminal generates a digest of the data, encrypts it with its private key to create signature information, and sends this along with the encrypted data. The second terminal decrypts the signature with the first terminal's public key, compares it with a freshly computed digest of received data, and thus verifies integrity through this elegant intermediary mechanism rather than through complex verification protocols.
3Reliability
If encrypted transmission is used, then data security is improved, but transmission efficiency decreases
Solution Approach 1:
The patent applies the extraction principle by separating the verification function from the main data transmission process. Instead of encrypting and verifying entire data sets, the system extracts only the essential verification element - the digest information - and transmits this compact representation. The first terminal calculates the digest of the original data, encrypts this small digest with the private key to create signature information, and transmits this compact signature along with the encrypted data. The second terminal verifies by decrypting the signature and comparing with a locally computed digest. This extraction of only the critical verification component maintains high transmission efficiency while ensuring robust security.
Data Source
AI summary
The present disclosure provides a data transmission method and system, and a terminal, for use in ensuring the integrity and security of file transmission among different terminals in a smart office scene. The method includes: a first terminal obtains data to be transmitted; the first terminal determines first digest information of the data to be transmitted, wherein the first digest information represents fixed-length encrypted information related to the data to be transmitted; and the first terminal sends to a second terminal the first digest information and the data to be transmitted.