Huazhong University of Science and Technology

Weiqi Dai

Hai Jin

Deqing Zou

Kexuan Zhao

Yan Xia

Ziyi Liang

Jun Deng

Fengwei Wang

Bingcheng Zhao

Jinkai Liu

The present invention relates to a blockchain-based system and method for preventing unauthorized deletion of surveillance video, the system at least comprising: a plurality of camera components, for generating surveillance video; at least one video-recording node, for connecting to a blockchain network and randomly generating a key pair, splitting the video file received from the camera components into a plurality of video-file blocks and randomly sending them to participation nodes across the blockchain network for storage, and recording hash values of the stored video files and node information; and a blockchain network device, for updating the hash values of the video files uploaded by the video-recording nodes based on a smart contract. In the present invention, uploading and storing time for camera-videos is recorded by the smart contract as tamper-resistant time reference for law enforcement, protecting video data from malicious deletion at video-recording nodes without the need of redundant space.

Blockchain-based system and method for preventing unauthorized deletion of surveillance video

The present invention provides an anti-trapdoor-leakage on-chain data restoration system, at least comprising: a blockchain node, for broadcasting transaction data of a request-initiating person to blockchain nodes and proposer nodes in other groups, respectively; and a proposer node, for performing computation of a Chameleon-Hash function using a key set that is generated by a key-generating module provided in the proposer node, packaging the transaction data to generate a new block, and distributing the new block to all the blockchain nodes so that the blockchain nodes update their respective underlying ledgers according to the new blocks broadcasted by the proposer. The system of the present invention not only realizes such functions as restoration and editing of the transaction data, but also protects operational security and reliability of blockchains.

Anti-trapdoor-leakage on-chain data restoration system and method thereof

The present disclosure involves a sidechain testing system and method for improving security and stability of a smart contract.

Sidechain testing system and method for improving security and stability of a smart contract by generating sidechains having mirror image accounts of part or all mainchain assets

The present invention provides a TrustZone-based security isolation system for shared library, the system at least comprising: a sandbox creator, a library controller, and an interceptor, the sandbox creator, in a normal world, dynamically creating a sandbox isolated from a Rich OS, the interceptor, intercepting corresponding system-calling information and/or Android framework APIs by means of inter-process stack inspection, the library controller, performing analysis based on the intercepted system-calling information and/or Android framework APIs, redirecting a library function to the sandbox, and switching calling states of the library function in the sandbox as well as setting up a library authority. The present invention has good versatility, low cost and high security. It realizes isolation of the library without increasing the trusted bases in the Secure World of the TrustZone, effectively reducing the risk of being attacked.

TrustZone-based security isolation method for shared library and system thereof

The present invention involves with a cloud tenant oriented method and system for protecting privacy data. The method comprises at least the following steps: analyzing event handler information and/or behavioral signature information of request information and determining an execution mode, selecting at least one node without a behavioral signature plot to execute the tenant request and recording an execution result, generating a behavioral signature plot based on the execution result, and dynamically detecting security-sensitive behavior based on the behavioral signature plot. The present invention ensures data security during processing of security-sensitive data for cloud services by adopting a technology based on behavioral signatures, and prevents attackers from exploiting vulnerabilities and bypassing security control to conduct malicious operations.

Cloud tenant oriented method and system for protecting privacy data

In at least one embodiment, a method for secured rollback of a virtual Trusted Platform Module (vTPM) that renders available functionalities offered by Trusted Platform Module (TPM) on a computer to a virtual machine (VM) is provided. The method includes taking and saving a snapshot of current state of a virtual machine as well as a snapshot of the corresponding vTPM, upon receiving a request for taking a snapshot of the virtual machine. The method further includes converting the snapshots into the current state of the virtual machine and the current state of the vTPM, respectively, upon receiving a request to roll back the virtual machine.

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Hubei, China

Weiqi Dai