Shanghai Nanojclean Technology Co., Ltd.

Vechain Global Technology Sarl

Bangya Ma

Jianliang Gu

Lei Zhang

Duanxin Lu

Qiangle Geng

A blockchain-based workflow node certification method includes a certification party establishing a general workflow template. The general workflow template includes a plurality of workflow nodes each having an audit attribute for indicating whether the workflow node needs to be certified. The certification party establishes a general data template based on the general workflow template, and the general data template and the general workflow template are instantiated. A current workflow node is acquired in the instantiated general workflow template, and whether the current workflow node needs to be certified-is determined, based on the audit attribute. Certification, if needed, is performed by a centralized certification party, and users can create and modify transaction processes as needed to meet the needs of changeable transactions. By combining central certification with blockchain certification deposition, the security of workflow node process implementation and the privacy of specific data are ensured.

Blockchain-based workflow node certification method and device

Methods for splitting and recovering a key, a storage medium, a computer program product, and a key management system (), wherein the key management system () comprises a management device () used for managing user equipment of users in a user group and a hardware security module () connected to the management device (). The method for splitting a key comprises: at the hardware security module (): obtaining the number of the users in the user group and a first predetermined value (); randomly generating a transaction key associated with the processing authority of the current transaction on the basis of messages of other users except the splitting user in the user group (); splitting the transaction key into a plurality of sub-keys the same as the users in number, wherein each sub-key in the plurality of sub-keys corresponds to one user in the user group (); and encrypting the plurality of sub-keys by using public keys of the users corresponding to the plurality of sub-keys, respectively ().

Methods for splitting and recovering key, program product, storage medium, and system

The present application discloses a key security management system and a key security management method, a computer-readable storage medium, and a computer program. The key security management system includes a security host and a hardware security device. The security host is configured to receive a first operation request, verify the first operation request, and generate a second operation request based on the first operation request when the verification is passed, wherein the first operation request and the second operation request both include an identification. The hardware security device is configured to receive the second operation request from the security host, verify the second operation request, parse the second operation request to obtain a type of the second operation request when the verification is passed, and perform an operation related to a key pair associated with the identification based on the type of the second operation request, wherein the key pair includes a public key and a private key specific to the identification.

Key security management system and method, medium, and computer program

The present disclosure provides methods and devices for key management. In one example, a method of key management comprises: obtaining, at a user device, a number of users in a group of users and a minimum number of users for restoring a transaction key; randomly generating the transaction key; splitting the transaction key into a plurality of sub-keys, the number of sub-keys being the same as the number of users; and sending the plurality of sub-keys to a management device, each of the plurality of sub-keys being encrypted with a public key of a user corresponding to a sub-key.

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Shanghai, China

Bangya Ma