Verifying method for network file transmission

Abstract

The invention provides a verifying method for network file transmission. File block transmission data and block hash codes are adopted in the method. The method comprises the following steps of: after block transmission finishes, extracting the block hash codes and comparing the extracted block hash codes with the value acquired by transmission, if an error happens, retransmitting the value from another data source, otherwise, preserving the block data and the block hash codes in a file; after the file is transmitted, acquiring secondary verification hash codes of file blocks from a server, performing secondary verification hash code extraction on the file preserving the block hash codes, comparing, if different, newly requesting the server for the addresses of other file servers, and retransmitting; and repeating the processes till the secondary verification hash codes of the file blocks are compared successfully. Compared with the prior art, the method has the advantages that: besides hash code verification of the file blocks, secondary verification of the hash codes of the file blocks is performed, so that the complete accuracy of file verification is ensured and the reliability of file transmission is improved. The secondary verified hash codes of the file blocks are acquired by secondary hash calculation of the hash codes of the file blocks, the number of the file blocks is limited, and the advantage is obvious compared with massive time consumption in hash calculation of the whole file. When the secondary verified hash codes of the file blocks are different, error file blocks of the file can be quickly found by using the block hash codes; and compared with a mode of directly downloading the file blocks, massive broadband resources are saved.

Description

technical field [0001] The invention belongs to the field of computer networks, in particular to a verification method for network file transmission. Background technique [0002] Modern network is an indispensable part of life and work. People add high-definition and high-quality multimedia enjoyment, so high-definition multimedia files are the future development trend, but the data volume of high-definition multimedia files is huge, and the file data volume may be several gigabytes. to a dozen G. The transmission efficiency, stability and reliability of the network transmission of such large data files need to be solved urgently. [0003] Existing network files are usually transmitted in blocks, and only by comparing the hash codes of the file blocks can it be judged whether the currently downloaded file blocks are correct. During file transfers, sometimes there is some malicious data, the wrong block content is sent, and a hash code is generated for that content. After...

AI Technical Summary

Problems solved by technology

After the terminal receives the block, even if it extracts the hash code of the block by itself and compares it with the transmission, it determines that the block is received correctly, but it is actually fake data, so only the hash code verification of the file block cannot fully guarantee the correctness of the file verification

Also, if the hash calculation of the entire file is performed after the file transfer is completed, if the file data volume is extremely large, the hash calculation itself will consume a lot of time and bandwidth resources

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