区块链到的安全性是什么,区块链的安全性通过什么算法保证

㈠ The security rules of blockchain

The security rules of blockchain, that is, the first rule:
Storage is everything
A person’s property ownership and Security fundamentally depends on how the property is stored and defined. In the Internet world, massive user data is stored on the platform's servers. Therefore, the ownership of this data is still a mystery. Just like who owns your and my social IDs, it is difficult to determine, but user data assets have pushed up The market value of the platform, but as a user, does not enjoy the market value dividend. The blockchain world has led to changes in storage media and methods, allowing the ownership of assets to be delivered to individuals.
Extended information
The risks faced by the blockchain system are not only attacks from external entities, but also attacks from internal participants, as well as component failures, such as software failures. Therefore, before implementation, it is necessary to develop a risk model and identify special security requirements to ensure an accurate grasp of risks and response plans.
1. Security features unique to blockchain technology
● (1) Security of written data
Under the action of the consensus mechanism, only when most nodes (or multiple key nodes) in the entire network When everyone agrees that the record is correct at the same time, the authenticity of the record can be recognized by the entire network, and the record data is allowed to be written into the block.
● (2) Security of reading data
Blockchain does not have inherent security restrictions on information reading, but it can control information reading to a certain extent, such as encrypting certain elements on the blockchain, The key is then handed over to the relevant participants. At the same time, the complex consensus protocol ensures that everyone in the system sees the same ledger, which is an important means to prevent double payments.
● (3) Distributed Denial of Service (DDOS)
Attack Resistance Blockchain’s distributed architecture gives it point-to-point, multi-redundant characteristics, and there is no single point of failure, so it is more resistant to denial of service attacks. The method is much more flexible than a centralized system. Even if one node fails, other nodes are not affected, and users connected to the failed node cannot connect to the system unless there is a mechanism to support them to connect to other nodes.
2. Security challenges and response strategies faced by blockchain technology
● (1) The network is open and undefended
For public chain networks, all data is transmitted on the public network, and all nodes joining the network You can connect to other nodes and accept connections from other nodes without any obstacles. There is no authentication or other protection at the network layer. The response to this type of risk is to require greater privacy and carefully control network connections. For industries with higher security, such as the financial industry, it is advisable to use dedicated lines to access the blockchain network, authenticate the accessed connections, exclude unauthorized node access to avoid data leakage, and pass the protocol stack level firewall Security protection to prevent network attacks.
● (2) Privacy
The transaction data on the public chain is visible to the entire network, the public can track these transactions, and anyone can draw conclusions about something by observing the blockchainThe conclusion is not conducive to the legitimate privacy protection of individuals or institutions. The response strategies for this type of risk are:
First, the certification agency acts as an agent for users to conduct transactions on the blockchain, and user information and personal behaviors do not enter the blockchain.
Second, instead of using a network-wide broadcast method, the transmission of transaction data is limited to nodes that are conducting relevant transactions.
Third, access to user data is controlled by permissions, so only visitors holding the key can decrypt and access the data.
Fourth, use privacy protection algorithms such as "zero-knowledge proof" to avoid privacy exposure.
● (3) Computing power
Blockchain solutions using proof-of-work are faced with the problem of 51% computing power attack. With the gradual concentration of computing power, it is objectively possible that organizations that control more than 50% of the computing power will emerge. Without improvement, it cannot be ruled out that it will gradually evolve into the law of the jungle where the jungle is the law of the jungle. The response strategy for this type of risk is to use a combination of algorithms and realistic constraints, such as joint management and control using asset mortgages, legal and regulatory means, etc.

㈡ What is the main way to ensure the security of blockchain?

Blockchain technology is a distributed recording technology that encrypts and distributes storage of data. , to ensure data security and reliability.
The security of the blockchain is mainly ensured through the following methods:
1. Encryption technology: The blockchain uses symmetric encryption and asymmetric encryption algorithms, which can effectively protect the security of data.
2. Distributed storage: Blockchain data is not stored centrally on a single node, but is stored dispersedly on various nodes in the network, which effectively prevents data tampering and loss.
3. Consensus mechanism: Blockchain usually uses a consensus mechanism to confirm the legitimacy of transactions, which helps prevent malicious transactions from occurring.
4. Contract mechanism: Blockchain can automatically execute transactions through smart contracts, which helps prevent manipulation of transactions.
Blockchain technology also brings some challenges while achieving security. For example, the security of the blockchain can be attacked by vulnerabilities, or assets can be stolen because private keys are leaked. Therefore, when using blockchain technology, you also need to pay attention to issues such as identity authentication and password security to ensure the security of the blockchain.
In addition, the security of blockchain technology may also be affected by policies, regulations, etc. For example, in some countries and regions, blockchain technology may be subject to censorship and restrictions, which may also have an impact on the security of the blockchain.
In general, the security of blockchain technology is mainly guaranteed through encryption technology, distributed storage, consensus mechanism and contract mechanism, but other challenges and influencing factors need to be paid attention to.

Is blockchain safe?

MIT said that blockchain is currently the most secure conceptual technology, but like any technology, developers must When programming requirements into products and services, security issues and vulnerabilities may occur. Therefore, when choosing a blockchain, we must choose a chain with corresponding trust endorsement and high-end technical level, such as the smart Yunzhou Li blockchain.

㈣ Is blockchain safe?

Hi, everyone, I am your Q&A assistant—Zi Xiaochen. Recently, blockchain resistance has been widely concerned and discussed. But there are many people who don’t know much about its safety. So today we will talk about the security issues of blockchain.
First of all, would you like to hear an easy-to-understand metaphor? A friend of mine joked: "Blockchain is like a password lock. Without a password, no one can open it." Although this is simple and interesting, it makes a lot of sense. Since the blockchain uses distributed ledger technology, data is stored in a huge network, and the transmission between each node uses asymmetric encryption, the blockchain has extremely high security, and third-party attacks are very vulnerable. difficult.
Secondly, of course there are some security issues that need attention. For example, hacker attack methods such as "51% attack" can pose a threat to the blockchain. In addition, there are also security risks in virtual currency trading venues, such as Bitcoin exchanges, and you need to pay attention to precautions. Therefore, when choosing a blockchain platform or participating in virtual currency transactions, you need to know more and consider carefully to avoid losses.
In short, blockchain is an open technology, which has huge advantages in ensuring data security and preventing tampering. But we also need to be alert to potential security risks and choose reliable platforms and exchanges to participate in cryptocurrency investments.
I hope my answer can help you better understand the blockchain and its security issues. If you have any questions or want to share your experience, please feel free to message me privately! Finally, don’t forget to like, comment and forward, follow my articles, more content is waiting for you!

Is it safe to apply blockchain technology to big data?

The answer to this question is yes, because a big feature of blockchain technology is that information cannot be tampered with , once the information is verified and added to the blockchain, it will be stored permanently. Unless more than 51% of the nodes in the system can be controlled at the same time, modifications to the database on a single node are invalid, so the data in the blockchain Extremely high stability and reliability. For example, Jinwowo Group can provide big data services with blockchain as the underlying technology. Its encryption technology can fundamentally ensure the security and storage of data.

㈥ The data transparency and security that blockchain can achieve are almost unprecedented, right?

Blockchain characteristics:

1. Decentralization . Blockchain technology does not rely on additional third-party management agencies or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, through distributed accounting and storage, each node realizes information verification, transmission and manage. Decentralization is the most prominent and essential feature of blockchain.

2. Openness. Blockchain technology basicsIt is open source. In addition to the private information of the transaction parties being encrypted, the blockchain data is open to everyone. Anyone can query the blockchain data and develop related applications through the public interface, so the entire system information is highly transparent.

3. Independence. Based on consensus specifications and protocols (similar to various mathematical algorithms such as the hash algorithm used by Bitcoin), the entire blockchain system does not rely on other third parties. All nodes can automatically and securely verify and exchange data within the system without the need for any human intervention.

4. Security. As long as you cannot control 51% of all data nodes, you cannot manipulate and modify network data at will. This makes the blockchain itself relatively safe and prevents the concealment of data changes that can be easily interpreted by humans.

5. Anonymity. Unless required by legal regulations, technically speaking, the identity information of each block node does not need to be disclosed or verified, and information transfer can be carried out anonymously.

㈦ Is the higher the blockchain height, the safer it is?

The higher the blockchain height, the safer it is. Blockchain is simply a billing system. Every ten minutes, Bitcoin packages all bills into a block that records transactions. Each block is connected to the previous block, forming a blockchain.

The block height refers to how many blocks are generated. The block height is used to measure the distance between a certain block and the first block. The block height can be accurately understood through the block height. The position of a certain block on the chain is equivalent to locating a coordinate for the block.

Instructions for the system

A block has two identifiers, one is the hash value of the block header, and the other is the block height. The hash value of the block header is a number obtained by performing a secondary hash calculation on the block header using the SHA256 algorithm. The block hash value uniquely and unambiguously identifies a block.

Any node can independently obtain the block hash value by simply hashing the block header. But since the block height is just a position in the blockchain, the block height is not a unique identifier because multiple blocks created at the same time may have the same block height.

㈧ Blockchain and its security mechanism

Blockchain technology has been mainly used in virtual currencies so far. The main example is the Bitcoin system. Blockchain is a distributed database composed of consecutive blocks. , containing multiple pieces of information. (Multiple nodes back up the same data and maintain continuous transaction files). The blockchain has no managers and no center at all. If the center conducts transactions, the biggest worry is the security of the transaction. Today's The editor introduces the blockchain and its security mechanism.

Characteristics of centralized and distributed transactions

Blockchain is a distributed database with centralized characteristics. The following examples are centralized in financial systems Comparison with the split-bridge layout. For red, yellow and blue, according to the traditional financial mechanism, transactions must be conducted through banks. However, after adopting the distributed block-sensitive chain model, there is no need to conduct transactions automatically through banks.Main transaction.

(1) Centralized model:

1) Transactions through financial institutions such as banks

2) Banks uniformly manage balances, account numbers and other information

3) It is necessary to open an account in advance and obtain an ID card.

4) Security depends on the bank, and fraud needs to be checked through various regulations and systems.

(2) Distribution model:

1) Transact with users on the P2P network

2) The address is managed by the participants themselves, and the balance is managed by the globally shared distributed account book

3) You need to install the software and connect to the P2P network