Reliable Integrity Preservation Analysis of Video Contents with Support of Blockchain Systems

Round 1

Reviewer 1 Report

（1）The contribution is not clear. It should be clearly described in section 1.

（2）It is suggested to depict a flow chart of your proposed scheme.

（3）What is functionality of the blockchain in your proposed scheme?

（4）The proposed scheme should be compared with other existing scheme to highlight your work. But the comparative results are less.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

The paper presents an approach to secure videos in order to detect corrupted videos. Thus, the authors put forward a methodology that uses metadata to know if a video is original or has been modified. 

In the proposed examples, the metadata concerns the source phone as well as the compressed videos. Databases of videos modified with different software were modified in order to compare the different metadata. 

Blockchain technology has been used to keep a traceability of the implemented information. 

The result of this work was tested using different corrupted videos. 

While the work is innovative and of good quality, some questions remain. 

- Blockchain. Why this decentralized choice and not a classical system for this kind of application? 

- The state of the art on the Blockchain part has touched on powerful platforms (in the paper a PC I7 with 16 G of RAM) but why not have tested on embedded or low cost platforms. Several works propose lightweight blockchain so if we were to use this kind of platform, would this work be efficient? 

- Have you thought about comparing different blockchain and failures in your choice. Why not Quorum? Why not Hyperledger Fabric? What constraints made your choice stop at Klaytn.?

- Why did you choose to use only metadata, wouldn't it be better to use QR code to secure the system even more?

- if the video has been attacked by signal processing without being corrupted, how to do

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

The authors propose an integrity analysis scheme of video contents using a blockchain system. The proposed scheme stores the core points of video content analysis in the blockchain system to verify the results of the video's reliability. The paper is interesting. It is a very important research area nowadays. My comment and suggestions are as follows.

- Figure 1 is very informal. It must be improved, perhaps the authors can use a formal diagram.

- The entire video comparison method needs more details.

- Is it a real-time proposal? The time response of the proposal must be evaluated.

- The costs (e.g: gas) of the tasks (insert, search) regarding the proposed blockchain must be evaluated.

- This paper is an extension of the author's previous work. It is not clear the benefit of the difference between the new and previous proposals. The authors must evaluate it to highlight this aspect.

"Compared to the our previous method [17], the proposed mechanism adds a new function to calculate the hash value of the whole source code in the front-end server and compare it with the hash value stored in the blockchain system. In this structure, whenever the source code in the front-end server is updated, its hash value is stored with its time stamp separately in the blockchain system."

Author Response

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Round 2

Reviewer 1 Report

The authors have completed the paper revision according to the reviewers' comments. 

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

In the experimentation part you talked about the implementation of the Blockchain on a Raspberry platform. 

Several works in the literature talk about the implementation of the Blockchain on Raspberry PI. We have to propose a comparative study with these works in terms of number of blocks, execution time but also energy consumption. 

Among the works from which you can draw inspiration:

·       E-Vote Platform for University Environment. Future Internet 2022, 14, 269. https://doi.org/10.3390/fi14090269

·       Convergence of Internet of Things and Blockchain Technologies. EAI/Springer Innovations in Communication and Computing. Springer, Cham. https://doi.org/10.1007/978-3-030-76216-2_4

·       IoMT-Based Platform for E-Health Monitoring Based on the Blockchain. Electronics 2022, 11, 2314 https://doi.org/10.3390/electronics11152314 

·       Raspberry Pi-based Intelligent Cyber Defense Systems for SMEs and Smart-homes: An Exploratory Study”, EAI Endorsed Trans Smart Cities, vol. 6, no. 18, p. e4, Aug. 2022.

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

The authors included my suggestions.

Author Response

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Author Response File: Author Response.pdf

Round 3

Reviewer 2 Report

The author answers to different questions.