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Multimedia data tampering detection method

A multimedia data and tampering detection technology, which is applied in digital data protection, instruments, character and pattern recognition, etc., can solve the problems of malicious forgery or tampering of multimedia data, and the inability to guarantee the credibility of multimedia data, so as to facilitate real-time Achieve, reduce computing overhead, and ensure credibility

Active Publication Date: 2021-10-22
SOUTH CHINA UNIV OF TECH +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the multimedia data stored on these devices may be maliciously forged or tampered with, which makes the credibility of multimedia data cannot be guaranteed

Method used

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  • Multimedia data tampering detection method

Examples

Experimental program
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Embodiment

[0029] This embodiment discloses a method for multimedia data tampering detection, such as figure 1 As shown, the method for tampering detection includes the following steps:

[0030] S1. The audio and video multimedia data to be recorded on the storage medium is sequentially organized frame by frame;

[0031] S2. Encapsulate the multimedia data by frame, store in segments, and pre-set the duration of each segment of multimedia data file as t minutes;

[0032] In the present embodiment, t is 2, that is, each section of multimedia data file records 2 minutes of multimedia data;

[0033] S3, taking every N segment of multimedia data files as a group, constructing a metadata hash tree according to the hash values ​​of each group of multimedia data files and corresponding metadata information, wherein the positive integer N=2 n , N is a power of 2, n=1, 2, 3, ..., the metadata hash tree is a hash binary tree, with a group of 2 leaf nodes, in order from left to right, each group ...

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Abstract

The invention discloses a multimedia data tampering detection method. The method comprises the following steps of packaging audio and video multimedia data needing to be recorded on a storage medium and storing the data in a segmented mode; constructing a metadata hash tree according to the hash values of the multi-segment grouped multimedia data files and the corresponding metadata information, and constructing corresponding metadata blocks; recording the generated metadata blocks, and linking the metadata blocks by using a forward hash chain structure; and carrying out tampering detection on the multimedia data file by the verifier according to the recorded metadata block forward hash chain. According to the method, tampering detection is carried out on the grouped multimedia data files by utilizing the metadata blocks, and multiple verification is carried out on the metadata blocks by utilizing the forward hash chains and the block timestamps of the metadata blocks, so that the credibility of the multimedia data files is ensured; meanwhile, only the metadata block head is digitally signed, so that the calculation overhead is reduced, and real-time implementation is facilitated.

Description

technical field [0001] The invention relates to the technical field of computer information security, in particular to a method for detecting tampering of multimedia data. Background technique [0002] Multimedia data such as audio and video recorded by monitoring equipment is an important example for determining the attributes of events or cases. In the existing technical solutions, the monitoring equipment usually stores multimedia data such as audio and video in the form of multimedia data files on a storage medium such as a hard disk or a mobile storage device, so as to investigate and collect evidence after the event. However, the multimedia data stored on these devices may be maliciously forged or tampered with, which makes the credibility of the multimedia data unable to be guaranteed. In view of this situation, it is necessary to perform tamper detection on the multimedia data recorded in the storage medium. Contents of the invention [0003] The object of the pr...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06F21/64
CPCG06F21/64Y02D10/00
Inventor 林耀荣张亮文李振明
Owner SOUTH CHINA UNIV OF TECH
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