Bitcoin international trading platform
however, to say a good thing, it depends on whether it is safe and reliable enough, whether the trading experience is smooth enough, and whether the currency is complete enough. From these dimensions, the security of the current mainstream centralized exchanges is not up to standard, and coin loss and theft often occur. In contrast, the decentralized exchange has achieved rapid development in the past two years. In particular, the head of the decentralized exchange has done a very good job in terms of user asset security and user experience, and the good experience can be comparable to that of the centralized exchange. It is believed that with the development of technology, decentralized exchanges will graally become the mainstream, and centralized exchanges will graally withdraw from the historical stage. The trading platform is better to be decentralized, such as me.
warm tips: the above explanations are for reference only, without any suggestions. There are risks in entering the market, so investment should be cautious. Before making any investment, you should make sure that you fully understand the nature of the investment and the risks involved in the proct. After a detailed understanding and careful evaluation of the proct, you can judge whether to participate in the transaction
response time: January 11, 2021. Please refer to the official website of Ping An Bank for the latest business changes
[Ping An Bank I know] want to know more? Come and see "Ping An Bank I know" ~
https://b.pingan.com.cn/paim/iknow/index.html
if you don't have bitcoin, you can buy some over the counter first, such as fire coin and bitpie, and then you can trade on the exchange. Fire coin, coin security and idax are all good platforms
finally, you can see the low and safe transaction
Development process
Cryptography (in Western European languages, from Greek krypt) ó S "hidden", and gr á Writing is a subject that studies how to transmit information in secret. In modern times, especially the mathematical study of information and its transmission, it is often regarded as a branch of mathematics and computer science, and is also closely related to information theory
Ron Rivest, a famous cryptographer, explained: "cryptography is about how to communicate in the presence of enemies". From the perspective of engineering, this is equivalent to the similarities and differences between cryptography and pure mathematics. Cryptography is the core of information security and other related issues, such as authentication and access control. The primary purpose of cryptography is the meaning of hidden information, not the existence of hidden information
Cryptography also promotes computer science, especially the technologies used in computer and network security, such as access control and information confidentiality. Cryptography has been applied in daily life, including ATM chip card, computer user access password, e-commerce and so oncipher is an important means for communication parties to transform information according to the agreed rules. According to these rules, changing plaintext into ciphertext is called encryption transformation; Changing ciphertext into plaintext is called decryption transformation. In the early stage, cipher only added or decrypted words or numbers. With the development of communication technology, voice, image and data can be added or decrypted
Cryptography is graally developed in the practice of the struggle between coding and decoding, and with the application of advanced science and technology, it has become a comprehensive cutting-edge technology. It is closely related to linguistics, mathematics, electronics, acoustics, information theory, computer science and so on. Its practical research results, especially the cryptography and decoding methods currently used by governments all over the world, are highly confidentialthe rule of crypto transformation is called cryptosystem. The parameter indicating this transformation is called the key. They are an important part of cryptography
The basic types of cryptosystem can be divided into four types: disorderly according to the prescribed graphics and lines, changing the position of plaintext letters or numbers into ciphertext; Substitution -- one or more substitution tables are used to substitute plaintext letters or numbers for ciphertext; Cipher text: to change plaintext into ciphertext by using a pre-determined alphabetic or numeric cipher group instead of a certain phrase, word, etcscrambling-a series of sequences composed of finite elements are used as scrambling numbers, which are combined with plaintext sequences to form ciphertext according to the specified algorithm. The above four cryptosystems can be used alone or in combination to proce practical cryptosystems with high complexity
Since the 1970s, some scholars have proposed the public key system, which uses the mathematical principle of one-way function to realize the separation of encryption and decryption keys. The encryption key is public and the decryption key is confidential. This new cryptosystem has attracted the attention and discussion of cryptologyaccording to the rules of text and password, under certain conditions, various technical means are adopted to analyze the intercepted ciphertext, so as to obtain the plaintext and restore the cipher system, that is, to decipher the password. The requirements for decoding codes of different strength are different, even very different
In fact, secret letters were used in wars before BC. Herodotus, the father of western historiography, recorded some of the earliest secret letter stories in his history. In the 5th century BC, Greek city states had many conflicts and wars with Persia in order to fight against slavery and aggressionin 480 BC, Persia secretly assembled a powerful army to launch a surprise attack on Athens and Sparta
Demaratus, the Greek, saw the assembly in the city of Susa in Persia, covered the words on the board with a layer of wax, and sent it to the Greek to inform them of the plan of Persia. Finally, the Persian navy was lost in the Salamis Bay near Athenssince most people were illiterate in ancient times, the earliest form of secret writing only used paper and pen or equivalent items. With the improvement of literacy rate, real cryptography was needed. The two most classical encryption techniques are:
transposition cipher: rearrange the alphabetic order, such as' help me 'to' ehpl em '
substitution cipher: systematically changing a group of letters into other letters or symbols, such as' fly at once 'to' GMZ Bu podf '(each letter is replaced by the next letter)
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extended materials:
research
as the main discipline of information security, cryptography of Xi'an University of electronic science and technology ranks first in China
In 1959, under the instruction of Qian Xuesen, Xi'an University of Electronic Science and technology took the lead in carrying out cryptography research in China. In 1988, Xidian was the first to set up a master's program in cryptography, and in 1993, it was approved to set up a doctor's program in cryptography. It is one of the first two doctor's programs in cryptography in China and the only doctor's program outside the military, And become the national 211 key construction disciplinein 2001, information security specialty was established on the basis of cryptography, which is the first batch of universities in China to set up this specialty
the information security major of Xi'an University of Electronic Science and technology relies on the first-class national key discipline "information and Communication Engineering" (the second in China) and the second-class national key discipline "cryptography" (the first in China), which is the innovation platform of 985 project advantage discipline and the key construction discipline of 211 project
State Key Laboratory of integrated service network theory and key technology, National Engineering Laboratory of wireless network security technology, modern switching and network coding research center (Chinese University of Hong Kong - Xi'an University of Electronic Science and Technology), Key Laboratory of computer network and information security, Ministry of ecation The Key Laboratory of the Ministry of ecation and other national, provincial and ministerial scientific research platforms
among the 34 directors of the Chinese society of cryptography, 12 are from Xidian, and the two vice directors are graates of Xidian. The only member of China in the international society of cryptography is also from Xidian. It is no exaggeration to say that Xidian has become the core base for training cryptography and information security talents in China
the following is a brief list of Xi'an Xin'an graates: Lai Xuejia, member of international cryptographic society, designer of idea block cipher algorithm; Chen Lidong, research fellow of American Bureau of standards; Ding Cunsheng, Professor, Hong Kong University of science and technology; Xing Chaoping, NTU Professor, Singapore; Feng Dengguo, director of the National Laboratory of information security, Chinese Academy of Sciences, and vice president of the Chinese cryptographic society
Zhang Huanguo, executive director of China cryptographic society, Professor of Wuhan University and leader of Xin'an; He Dake, vice president of China cryptographic society, Professor of Southwest Jiaotong University and leader of Xin'an; He Liangsheng, chief cryptographer of PLA General Staff; Ye Jiqing, director of key management center of PLA
Xi'an University of Electronic Science and technology has three Chinese leaders in the field of information security: Xiao Guozhen, Wang Yumin and Wang Xinmei. Among them, Professor Xiao Guozhen is one of the main pioneers of modern cryptography in China. His concept of statistical independence of combinatorial functions and his spectral characterization theorem of correlation immunity of combinatorial functions are internationally known as Xiao Massey theorem
has become one of the basic tools of cryptography research, and opened up a new field of stream cryptography research. He is a member of the Executive Committee of the Asian cryptographic society, vice chairman of the Chinese cryptographic society, and a consultant to the editorial board of the International Journal of information security (ijis)
in 2001, WAPI, the mandatory standard for wireless network security formulated by Xi'an University of Electronic Science and technology, shocked the world. China owns the completely independent intellectual property rights of the technology, breaking the monopoly of IEEE in the world. The Wall Street Journal reported at that time that "China's Encryption Standard for wireless technology caused confusion in the instry."
this technology is also one of the few significant scientific and technological advances that China has made in the IT field with world influence
the information security major of Xi'an University of Electronic Science and technology ranked first in China for many years, which is the best reflection of its leading position in the national information security field
source: network cryptography
blockchain is a digital account book that can be jointly bookkept, and will record all transactions that have occurred and have been unanimously recognized by the system it's the same as the whole family. You're bookkeeping, and your father and mother are also bookkeeping. They can see the general ledger, but the saved information can't be tampered with any more
In 2008, Nakamoto first proposed the concept of blockchain subsequently, blockchain has become the core component of electronic currency bitcoin, which serves as the public account book for all transactions. By using peer-to-peer network and distributed timestamp server, the blockchain database can be managed independentlyextended data:
type of blockchain
1, public blockchain
any indivial or group in the world can send transactions, and transactions can be effectively confirmed by the blockchain, and anyone can participate in its consensus process. Public blockchain is the earliest and the most widely used blockchain. The virtual digital currencies of bitcoin series are all based on public blockchain. There is only one blockchain corresponding to this currency in the world
2, Alliance (instry) blockchain
instry blockchain: multiple preselected nodes are designated as bookkeepers within a group, and the generation of each block is jointly determined by all preselected nodes (preselected nodes participate in the consensus process), and other access nodes can participate in the transaction, However, regardless of the bookkeeping process (in essence, it is still managed bookkeeping, only distributed bookkeeping, how many preselected nodes, and how to determine the bookkeeper of each block to become the main risk point of the blockchain), anyone else can conct limited query through the open API of the blockchain
3, private blockchain
only uses the general ledger technology of blockchain for bookkeeping. It can be a company or an indivial, and enjoys the write permission of the blockchain. This blockchain is not very different from other distributed storage schemes