A key management method and device based on a blockchain digital copyright protection system

Abstract

The invention discloses a key management method based on a block chain digital copyright protection system, which includes: obtaining system initialization parameters as security parameters; obtaining multiple key information provided by multiple alliance member nodes, and according to the multiple The key information generates the system master public key through the DKG protocol, and divides the system master private key into multiple parts and distributes it to each alliance member according to the DKG key sharing method; when the user submits copyright data, the copyright The data is encrypted based on KP-ABE through MPK; when the copyright transaction requester obtains k blocks to confirm that the copyright transaction application is authorized, it generates a decryption private key based on the distributed KP-ABE protocol through its own part of the private key. key, where k is the block confirmation security parameter of the block chain; after the copyright transaction requester receives the transaction sent by the alliance organization, the decryption private key can restore the decryption key of the publishing right through the key sharing agreement, and Decrypt it for use.

Description

technical field [0001] The present invention relates to the technical field of block chains, in particular to a key management method and device based on a block chain digital copyright protection system. Background technique [0002] In the blockchain-based digital copyright protection system, each user has a pair of keys, which are divided into public keys and private keys. The public key can be made public, and the wallet address is also generated based on the public key. However, if you want to operate on this address, such as transferring money, you need to provide a private key. As long as anyone obtains the private key, he obtains all control over the data on this address (digital currency, copyright, etc.). Losing private keys is the most common mistake made by ordinary users. Since the private key is lost, no one can find it back, so the digital tokens in the account address corresponding to the private key are equivalent to being permanently frozen. According t...

AI Technical Summary

Problems solved by technology

According to statistics, currently about 4 million bitcoins are permanently frozen and cannot be transferred out

[0003] Currently common means of protecting keys include: 1. Keeping keys in online wallets or exchanges: any real blockchain project has an offline wallet, and the currency is stored in an online wallet or exchange for the convenience of transactions. is very unsafe

First of all, exchanges and online wallets are the main targets of hackers, and even if they take strict security measures, they cannot guarantee that they will not be hacked

Secondly, although the money placed in the exchange or online wallet appears to be yours in theory, if the exchange runs away or the internal staff cheats, your digital assets on it will be at great risk

2. Local computer storage: Due to the weak security awareness of users, they will suffer from vulnerabilities such as phishing attacks from the Internet, resulting in key theft

3. User brain memory: Compared with traditional passwords, blockchain passwords are very long and easy to forget, resulting in unusable accounts

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