Method and system of data transmission

Abstract

The invention discloses a method of data transmission. The method comprises the following steps: when the file data is stored at the client side, the client side uploads the digital digest of the file data to a server, the server obtains the result that whether the information of the file data with the same data content with the file data exists or not according to the data digest, and if the information of the file data exists, the data file is not required to be uploaded at the client side, and the uploading end is directly indicated to the client side. The invention also discloses a system of data transmission, which comprises a digital digest creating module, a digital digest uploading module, a file data transmission module, a digital digest retrieval and analysis module, an uploading judgment module and a memorizer. By comparing the digital digests of the data file, the invention prevents the files with the same contents from being repeatedly stored, reduces the occupation of the storage space at the server end and improves the utilization ratio of the network bandwidth; and the access load to the server is reduced through P2P transmission during the file downloading process.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a data transmission method and system. Background technique [0002] Digital digest is also called SHA Secure Hash Algorithm. This encoding method uses a one-way Hash function to "digest" the plaintext to be encrypted into a string of 128-bit ciphertexts, which is also called a digital fingerprint (Finger Print). And when different plaintext summaries are converted into ciphertext, the results are always different, so this string of summaries can become a "fingerprint" to verify whether the plaintext is the "true body". [0003] Using digital digest technology to turn files of arbitrary length into short messages of fixed length, it is similar to a function whose argument is file data, that is, Hash function. The quality of a Hash function is determined by the probability of collision. If an attacker can easily construct two files with the same hash value, then such a ha...

AI Technical Summary

Problems solved by technology

[0005] Files with different names but the same content occupy a large amount of storage space, resulting in great data redundancy and space waste;

[0006] In the process of uploading existing files on the server side, the client occupies a large bandwidth, which is a waste of network resources

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