区块链人没有隐私了怎么办,区块链人没有隐私了会怎么样

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㈠ How does the Tongxin Huzhu Network mutual aid platform protect user privacy with the help of blockchain technology?

Tongxin Huzhu is the first implementation of the blockchain. The first value is to provide trust, because data and transaction records are open and transparent.
All public data on the blockchain are desensitized: for example, only the user's last name is disclosed, and only the first and last four digits of the ID number are displayed to protect the user's information from being leaked;
Use Principle of existence proof: The real data of user identity is not saved on the blockchain, nor is it encrypted; the method of saving the Hash of ID card + name is used. Only people who know the user’s true identity can use Hash to confirm whether the person is on the blockchain;

㈡ Will the blockchain expose our privacy

The answer is of course Won't. What the blockchain system wants to save is also targeted

㈢ What issues need to be understood for the security of blockchain technology

I believe everyone should be familiar with blockchain technology, and today we Let’s take a look at what issues we need to pay attention to in the field of blockchain technology security. Let’s start with today’s main content.

Currently, most blockchain projects carried out within enterprises are so-called "private chains with permissions". Unlike public blockchains, private blockchains can only be accessed by a selected group of users who have the authority to enter, verify, record, and exchange data on the ledger.

Of course, for an "outsider" who has never been allowed to join, such a network is almost impossible to break. But with the emergence of private chains, another question arises: In order to improve privacy and security, do we really need to abandon decentralization?

Mike Orcutt from "MIT Technology Review" wrote that a private chain system "might make its owners feel more secure, but it really just gives them more control, meaning they can make changes regardless of whether other network participants agree or not." Such systems need to come up with balancing mechanisms to grant different levels of permissions to different user groups and perform identity checks on validators to ensure they are who they claim to be.

That’s why many companies are looking for a way to have both—the decentralization of a public chain and the extra security of a private chain. Consortium chains developed by major vendors such as IBM, Corda, and Ripple currently appear to be good security options. Simply put, they provide businesses with access to centralized systems that themselves have a level of cryptographic auditability and security.

Other companies are also considering how to adjust public chains to meet their security needs. For example, the Ethereum blockchain already provides mechanisms that can be used to ensure the privacy of network participants, including ring signatures, stealth addresses, and storing private data on the public chain.

In general, the blockchain field is developing steadily towards new solutions that define technology-granular privacy layers for public chains, private chains, and consortium chain networks. IT training found that companies are actively investigating and patching known vulnerabilities and adopting new mechanisms to ensure that all parties are protected and that no malicious hacker can break through and exploit vulnerabilities in the ledger.

㈣ How is the security of blockchain? What are the risks of blockchain?

The hottest topic at the beginning of the new year is blockchain. , but there are still many people who are skeptical about its security and risks. So what is the security of blockchain? What are the risks of blockchain? Below we will give you the answers one by one. I hope it will be helpful to you after reading them.
How is the security of blockchain Anyuan?
First of all, blockchain is a distributed database technology. Distributed technology mainly refers to storage architecture. The distributed architecture adopted by the blockchain not only stores the ledger data on each node, but also each node must contain the data of the entire ledger. This completely distributed architecture brings extremely high security, and no one can destroy all nodes at the same time.
Secondly, blockchain technology can achieve tamper resistance through "blocks" and "chains". The unit of data storage in the blockchain is the block. When each block is generated, it must contain the unique "characteristic value" of the previous block (which can be regarded as the ID card of the block). Each block is generated strictly according to the The order of time is lined up to form a "chain".
Security is a major feature of blockchain technology. However, from the perspective of privacy protection, the block chain emphasizes openness and transparency, and any node has the right to operate according to the consensus algorithm, so it is not suitable for scenarios where data privacy needs to be protected.
What are the risks of blockchain?
1. Technical risk: For example, the launch of Ethereum was once popular, but because it is a digital currency with smart contracts, it brings the risk of hacker attacks due to possible loopholes in smart contracts. THEDAO, the largest crowdfunding project in Ethereum, was hacked and lost more than $60 million.
2. Legal risks: The legality issues of digital currency issuance, notarization and confirmation of rights, and legality issues of evidence, including legality issues of smart contracts, digital bills, accounting and liquidation, and equity crowdfunding, are currently in my country and The rest of the world is still legally blank.
3. Crime risks: Using digital currencies to abscond with the money, using digital currencies to launder money and illegal gambling, using smart contracts and digital bills designed to defraud profits, using blockchain technology to commit anonymous crimes, etc. Due to the current regulatory gap, there may be huge criminal risks.
The above is what the editor brings to you. How about the security of blockchain? What are the risks of blockchain? of the entire content.

㈤ How to set private privacy in Jack Ma's blockchain

As a decentralized database technology, the private privacy setting of blockchain is a very important part. Jack Ma may set up on his own blockchainPrivacy protection in the following aspects:
1. Identity verification: On Jack Ma’s blockchain, individual users can protect their privacy through identity verification. This means that only authenticated users can access specific information.
2. Encrypted data: Jack Ma can use blockchain technology to encrypt personal data to prevent unauthorized access. This encryption technology protects user privacy by ensuring that only authorized users can access data.
3. Anonymous transactions: An anonymous transaction function can be set up on Jack Ma’s blockchain, allowing users to conduct transactions without exposing their identities. This approach can protect user privacy to the greatest extent.
4. Restrict access rights: Jack Ma can set access limits on the blockchain to only allow specific users or organizations to access specific information. This approach protects user privacy by ensuring that only authorized people have access to sensitive information.
In short, Jack Ma can protect his blockchain privacy through various means such as identity or verification, encrypted data, anonymous transactions and restricted access rights. These measures ensure that users’ data and privacy are protected to the greatest extent possible.

㈥ What risks does the blockchain face that need to be addressed

Although the blockchain industry is experiencing rapid development driven by the influx of capital and talent, as an emerging industry, Frequent warnings about its security vulnerabilities have triggered concerns about the risks of blockchain.

Yu Kequn, director of the National Information Technology Security Research Center, pointed out that the emergence of blockchain has brought a lot of expectations to people regarding issues such as privacy exposure, data leakage, information tampering, and online fraud. However, there are still many challenges in the security of blockchain.

Li Bin, assistant director of the China Information Security Evaluation Center, analyzed that the current blockchain is divided into three types: public chain, private chain, and alliance chain. No matter which type has different advantages in algorithms and protocols, There are security challenges in many aspects such as , usage, time limits and systems. What is particularly critical is that the current blockchain is still facing the 51% attack problem, that is, a node has the ability to successfully tamper and forge blockchain data by mastering more than 51% of the calculation examples in the entire network.

It is worth noting that in addition to the risk of external malicious attacks, the blockchain also faces the threat of its endogenous risks. Yu Kequn reminded that how to build a complete secure application system around the equipment, data, applications, encryption, authentication and permissions of the entire blockchain application system is an important issue that all parties must face.

Wu Jiazhi also analyzed that as an emerging industry, practitioners in the blockchain industry lack security awareness, resulting in the current blockchain-related software and hardware having a low security factor and a large number of security vulnerabilities. In addition, , there are many links in the entire blockchain ecosystem. In comparison, the relevant security practitioners are dispersed and it is difficult to form a joint force to solve the problem. Meeting the above challenges requires systematic solutions.

Content source China News Service

㈦ How blockchain technology protects the privacy and rights of information subjects

Privacy protection methods can be divided into three categories:
First, the privacy protection of transaction information; Privacy protection for senders, transaction recipients, and transaction amounts, including currency mixing, ring signatures, and confidential transactions.
The second is privacy protection for smart contracts, and protection solutions for contract data, including zero-knowledge proof, multi-party secure calculation, homomorphic encryption, etc.
The third is the privacy protection of data on the chain, which mainly includes solutions such as ledger isolation, private data and data encryption authorized access.
Extended information:
1. Blockchain encryption algorithm isolates identity information and transaction data
1. Transaction data on the blockchain, including transaction address, amount, transaction time, etc., are open, transparent and queryable . However, the identity of the user corresponding to the transaction address is anonymous. Through the blockchain encryption algorithm, the separation of user identity and user transaction data is achieved. Before the data is saved on the blockchain, the user's identity information can be hashed, and the resulting hash value is used as the user's unique identifier. The user's hash value is stored on the chain instead of the real identity data information. Transaction data is bundled with hash values ​​rather than user identity information.
2. Therefore, the data generated by users is real. When using these data for research and analysis, due to the irreversibility of the blockchain, no one can restore the name, phone number, and email address of registered users through hash values. and other private data, playing a role in protecting privacy.
2. Blockchain "Encrypted Storage + Distributed Storage"
Encrypted storage means that a private key must be provided to access data. Compared with ordinary passwords, private keys are more secure and almost impossible to be cracked by violence. . Distributed storage and decentralized features reduce the risk of all data being leaked to a certain extent. However, with centralized database storage, once the database is attacked by hackers, all data can easily be stolen. Through "encrypted storage + distributed storage", users' data privacy can be better protected.
3. Blockchain consensus mechanism prevents individual risks
The consensus mechanism is a mechanism for blockchain nodes to reach a consensus on block information across the entire network, which can ensure that the latest blocks are accurately added to the blockchain and node storage The blockchain information is consistent and unforked, which can resist malicious attacks. One of the values ​​of the blockchain lies in the consensus governance of data, that is, all users have equal management rights to the data on the chain. Therefore, the risk of individual mistakes is first eliminated from the operation. Data decentralization is solved through the network-wide consensus of the blockchain, and zero-knowledge proofs can be used to solve verification problems and realize the scenario of using user privacy data in a public decentralized system. While meeting the needs of the Internet platform, it also So that part of the data is still only in the hands of the user.
4. Blockchain Zero-Knowledge Proof
Zero-knowledge proof means that the prover can make the verifier believe that a certain assertion is correct without providing any useful information to the verifier, that is, proof who can fully prove themselvesHe is the legal owner of certain rights and interests and does not leak relevant information, that is, the "knowledge" to the outside world is "zero". By applying zero-knowledge proof technology, data correlation verification can be achieved in the context of ciphertext, and data sharing can be achieved while ensuring data privacy.

What are the disadvantages of blockchain

Blockchain has many advantages and obvious disadvantages.

1. Cannot be tampered with or revoked
This is both an advantage and a disadvantage. There is no regret medicine in the blockchain. There is almost nothing you can do about the data changes in the blockchain. This is mainly reflected in: If the transfer address If you fill it in incorrectly, it will directly cause permanent losses that cannot be reversed; if you lose the key, it will also cause permanent losses that are irreversible. In reality, if you lose your bank card or forget your password, you can still go to a bank branch and your money will still be there.

2. The transaction ledger must be made public
The blockchain is distributed. On the public chain, making a document means that everyone has a complete ledger, and due to the block Calculating balances on the chain, verifying transaction validity, etc. need to trace every account, so the transaction data is open and transparent. If I know someone's account, I can know all his wealth and every transaction. , there is no privacy at all.

3. Performance issues associated with larger data
As mentioned earlier, everyone has a complete ledger, and sometimes it is necessary to trace every record, so as time goes by , when the transaction data is very large, there will be performance problems. For example, when using it for the first time, you need to download all the transaction records in history to work properly. In order to verify that you actually have enough money for each transaction, you need to trace back the history of each transaction to calculate it. balance. Although performance problems can be alleviated through some technical means (such as indexing), the problem still clearly exists.

4. Delay of blockchain
There is delay in blockchain transactions. Taking Bitcoin as an example, the validity of the currently generated transactions is affected by network transmission, because it requires Before most nodes on the network learn about this transaction, it will have to wait until the next accounting cycle (Bitcoin controls this to about 10 minutes), that is, the transaction must be recognized by most nodes. It is also affected by a small probability event, that is, when two or more nodes compete for accounting rights on the network at the same time, then two or more blockchain branches will be generated in the network. At this time, which branch records the data? If it is valid, you have to wait for the next accounting cycle, which is ultimately determined by the longest blockchain branch. Therefore, the transaction data of the blockchain is delayed.

Blockchain, as a conceptual innovation, can have a disruptive impact in specific fields. Faced with the advantages and disadvantages of blockchain, what needs to be done is to maximize its strengths and avoid weaknesses, and make the best use of it. Therefore, whether blockchain can become the underlying technology of a new generation of financial infrastructure is still a question.