Formula encryption blockchain

1. Block chain technology is considered to be the fifth core technology most likely to lead to disruptive revolution. After the stage of chaos and bubble period, with the intervention of national policies and the implementation of relevant supervision, +B39 will graally take the lead and develop in a healthy direction.
in 2017, blockchain became the focus all over the world. If at the beginning, the emergence of blockchain made people in the instry excited, and the ordinary people took an indifferent attitude and just ate melon Road, now it can be said that blockchain has quickly and deeply entered the public field of vision
the concept of blockchain was proposed by Nakamoto in 2008. It has the characteristics of decentralization, non tampering, traceability and so on, attracting many investors to participate in it. Blockchain has graally entered into various instries, which has brought considerable changes as well as some adverse effects
through the collection and collation of relevant data of China's blockchain instry, analysts analyzed and discussed the development trend of China's blockchain instry. The rising trend of blockchain popularity is obvious. From the network index trend chart of blockchain and digital currency in the past six months, it can be seen that the popularity of blockchain only increases, and even rises explosively by the end of 2017. According to the trend chart, it can be predicted that the growth of blockchain network index will show a gentle trend in the near future
the network index of digital currency closely related to blockchain is not much different from that of blockchain before 2018. That's because the popularity of blockchain ignites the value of bitcoin, and many people take the opportunity to follow suit, which makes the market once chaotic. Since the beginning of 2018, the network index of blockchain has far exceeded that of digital currency. This change shows that more people are focusing on blockchain, which will be more concive to the healthy development of blockchain technology
as the value of digital currency represented by bitcoin doubled, ICO came into being. ICO financing mode is similar to and different from the traditional IPO Financing Mode. It can open the global market and get more development opportunities. However, e to many people's ulterior motives and the fact that ICO does not go through any strict review process at present, the ICO market is in chaos. The positive and negative effects of ICO also make various countries hold different attitudes in the face of this mixed market
according to the attitude information table of some countries towards ICO, China and Japan have the most clear attitude. China has banned ICO projects and defined them as illegal financing; Japan allows ICO projects and takes the lead in establishing blockchain alliance; The Philippines, Russia, Canada and other countries adopt the mode of supervision and development, do not prohibit ICO projects, and actively build regulatory systems. The United States is a federal country, and the attitude of each state is different
it is worth mentioning that the attitude of Hong Kong and Macao of China towards ICO coincides with that of the mainland, while that of Taiwan is quite different. The person in charge of "Taiwan financial regulatory authority" promised to adopt a more friendly attitude and support enterprises to develop and adopt cryptocurrency and blockchain technology in Taiwan
the top 10 national blockchain platforms are mainly concentrated in Beijing, Shanghai and Guangzhou
according to the national blockchain platform TOP10, bitmainland, Babbitt / blockyuan and fire coin net have taken the top three positions. The blockchain platforms of TOP10 are mainly concentrated in Beijing, most of which were launched earlier than 2016. Generally speaking, the development of blockchain has driven the development of related instries, and also set off a wave of entrepreneurship
the enterprises related to blockchain are mainly concentrated in Beijing, Shanghai and Guangdong, which are affected by the high barriers of blockchain technology. Beijing is rich in human resources and has a good entrepreneurial environment. Shanghai has a unique financial position and has the greatest possibility of incubating the most successful enterprises in the application of blockchain. Guangdong has a strong entrepreneurial atmosphere, which can attract relevant entrepreneurs and promote the landing of relevant enterprises. In addition, Hangzhou also benefited from its excellent Internet finance instry, and the blockchain instry performed well. With the development of blockchain, there will be more related enterprises in more cities< The heat of br/> block chain has also been reced, and a large number of official account have been generated. From the TOP10 official account of WeChat, we can see that the number one fan of "digital money trend maniac" has been estimated to be about 800000 in the past seven days, and second "Wang Chai block chain journal" predicted that the active fans are also close to 500 thousand people. The estimated number of fans who are close to 400 thousand is "third". The official account also shows that more and more people are paying attention to the block chain instry.
blockchain is becoming more and more popular. The average salary of related posts was 23800 yuan before November 2017, and it has reached 25800 yuan by 2018. According to the chart of skills requirements for blockchain positions, the most important is the commonly used development languages (go, C + +, Java). In addition, we also need to have sufficient understanding of cryptography, formula algorithm, and smart contract. In addition, there are also positions with relatively low operation threshold. In general, the talent gap in the blockchain instry is relatively large< Br/> block chain technology is considered to be the fifth core technology most likely to trigger disruptive revolution. After the stage of chaos and bubble period, with the intervention of national policies and the implementation of relevant regulation, it will graally take the right track and develop towards health. The development of br/> block chains will inevitably proce bubbles, but these bubbles will graally become controllable with the healthy development of block chains. The development prospects of block chains and the innovations they can bring are unpredictable. In the future, let's leave this stage to it and watch its performance< br/>

2. Blockchain encryption algorithm
asymmetric encryption algorithm is a function that converts the original plaintext file or data into a series of unreadable ciphertext codes by using an encryption key. The encryption process is irreversible. Only holding the corresponding decryption key can the encrypted information be decrypted into readable plaintext. Encryption enables private data to be transmitted through the public network under the condition of low risk, and protects the data from being stolen and read by the third party
the core advantage of blockchain technology is decentralization, which can realize point-to-point transaction, coordination and cooperation based on decentralized credit in a distributed system without mutual trust by means of data encryption, time stamp, distributed consensus and economic incentive, so as to solve the high cost and low cost of centralized institutions Low efficiency and data storage insecurity provide solutions
the application fields of blockchain include digital currency, token, finance, anti-counterfeiting traceability, privacy protection, supply chain, entertainment, etc. with the popularity of blockchain and bitcoin, many related top domain names have been registered, which has a great impact on the domain name instry.

3. The encryption of jinwowo blockchain can ensure that the privacy of data sources can be better protected when big data is called, so as to eliminate the bad phenomenon of reselling data.

4.

Osmanthus fragrans doesn't belong to Osmanthus fragrans. Cigui, also known as Huaye tree, mouse thorn; It is a plant of Ilex family. Evergreen shrubs or small trees, landscaping tree species. It is mainly distributed in the middle and lower reaches of the Yangtze River in China

There are four groups of Osmanthus fragrans, namely Dangui, Jingui, Yingui and sijigui. Among them, Osmanthus fragrans, Osmanthus fragrans and Osmanthus fragrans all bloom in autumn and are collectively called August osmanthus. Generally, it takes at least 10 years for Osmanthus fragrans seedlings to bloom in open field. For newly transplanted seedlings, it is not allowed to apply fertilizer too early. Sowing seedlings, after two years of cultivation, the next spring can be transplanted, flowering period in ten years

5. It doesn't work if you open 120 frames depending on your resolution and display 60

6. First of all, these two are virtual assets. The price of these two kinds of digital currency, or a specific price of digital currency, is determined according to the market situation
the details of these two digital assets are as follows
bitcoin (bitcoin: bitcoin) was originally a kind of network virtual currency, which can buy real-life goods. It is characterized by decentralization, anonymity, and can only be used in the digital world. It does not belong to any country or financial institution, and is not subject to geographical restrictions. It can be exchanged anywhere in the world. Therefore, it is used as a money laundering tool by some criminals
the full name of NMC is "new media chain", the Chinese name is media chain, and the former domain name currency (also referred to as NMC) is two completely different currencies. NMC is the circulating currency of three decentralized application platforms: coin call [blockchain information community portal], coin search [blockchain network query tool], ncoin [digital currency exchange]. However, the prices of these two kinds of digital currencies will fluctuate with the market, which can not guarantee a development prospect. If the current price is concerned, bitcoin will be a bit higher.

7.

As an emerging technology, blockchain has attracted more and more attention. It is a new application of traditional technology in the Internet era, including distributed data storage technology, consensus mechanism and cryptography. With the establishment of various blockchain research alliances, more and more funds and personnel support related research. Hash algorithm, zero knowledge proof, ring signature and other cryptographic algorithms used in blockchain:

hash algorithm

as the basic technology of blockchain, the essence of hash function is to map a set of data of any length (limited) to a set of defined length data stream. If this function satisfies the following conditions:

(1) the calculation of hash value for any group of data is very simple

(2) it is difficult to find two different data with the same hash value

hash functions satisfying the above two properties are also called encrypted hash functions. In case of no contradiction, hash functions usually refer to encrypted hash functions. For the hash function, finding such that is called a collision. The current popular hash functions are MD5, SHA1, Sha2, Sha3

bitcoin uses sha256, and most blockchain systems use sha256 algorithm. So here's sha256< Step 1: additional filling bits. The length of the message is congruent with that of 448 mod512 (length = 448 mod512). The number of bits to be filled ranges from 1 to 512. The highest bit of the filled bit string is 1, and the rest bits are 0

Step2: additional length value. The bit length of the initial message (before filling) represented by 64 bit is appended to the result of step 1 (the low byte takes precedence)

Step3: initialize cache. A 256 bit cache is used to store the intermediate and final results of the hash function

Step 4: process 512 bit (16 word) packet sequence. The algorithm uses six basic logic functions and consists of 64 steps of iterative operation. Each step takes the 256 bit cache value as the input, and then updates the cache content. Each step uses a 32-bit constant KT and a 32-bit wt. Where WT is the packet after the packet, t = 1,2,..., 16

step5: after all 512 bit packets are processed, the output of the last packet of sha256 algorithm is 256 bit packet< In 2001, Rivest, Shamir and TauMan proposed ring signature for the first time. It is a simplified group signature, only ring members have no manager, and it does not need the cooperation between ring members. In the ring signature scheme, the signer first selects a temporary signer set, which includes signers. Then the signer can generate the signature independently by using his private key and the public key of others in the signature set without the help of others. Members of the signer collection may not know that they are included in it

ring signature scheme consists of the following parts:

(1) key generation. A key pair (public key PKI, private key ski) is generated for each member of the ring

(2) signature. The signer uses his private key and the public keys of any n ring members (including himself) to generate the signature a for the message M

(3) signature verification. According to the ring signature and message M, the verifier verifies whether the signature is signed by the member in the ring. If it is valid, it will be received, otherwise it will be discarded

ring signature satisfies the following properties:

(1) unconditional anonymity: the attacker can not determine which member of the ring generated the signature, even if the private key of the ring member is obtained, the probability is not more than 1 / n

(2) Correctness: the signature must be verifiable by all others

(3) unforgeability: other members of the ring can't forge the real signer's signature, and even if an external attacker obtains a valid ring signature, he can't forge a signature for message M

(1) anonymity. The verifier can verify that the signature is signed by a member of the group, but can't know which member it is, so that the signer can be anonymous< (2) traceability. In group signature, the existence of group administrator ensures the traceability of signature. The group administrator can revoke the signature and expose the real signer. The ring signature itself cannot reveal the signer unless the signer wants to expose or add additional information to the signature. A verifiable ring signature scheme is proposed. In this scheme, the real signer wants the verifier to know his identity. At this time, the real signer can confirm his identity by disclosing his secret information< (3) management system. Group signature is managed by group administrator, ring signature does not need to be managed, signer can only select a set of possible signers, obtain its public key, and then publish the set, all members are equal

the Xueshuo innovation blockchain Technology Workstation of Lianqiao ecation online is the only approved "blockchain Technology Specialty" pilot workstation of "smart learning workshop 2020 Xueshuo innovation workstation" launched by the school planning, construction and development center of the Ministry of ecation of China. Based on providing diversified growth paths for students, the professional station promotes the reform of the training mode of the combination of professional degree research, proction, learning and research, and constructs the applied and compound talent training system< br />

8. Hash algorithm and MD5 are all one-way hash functions. The difference is that the hash results of different source data may be the same, but MD5 will not be the same. That is: hash is many to one function, MD5 is one to one function. MD5 is generally used to verify the credibility of data, and sometimes it is also used for one-way encryption of password (but now this encryption result can be cracked).