How to measure the security of digital currency
Yin Zhentao, deputy director of the law and Finance Research Office of the Financial Research Institute of the Chinese Academy of Social Sciences, said that digital currency faces two risks. The first is the technical level. Digital currency relies on blockchain technology and a system, which will make it suffer from security impact, such as hacker attacks on computer systems. We have seen many practical problems in this process
Zhao Zhanzhan, a special researcher of intellectual property research center of China University of political science and law, believes that digital currency has anonymity, quickness and irrevocability. In addition, bitcoin and other digital currencies have high circulation in the world, so many criminals use digital currency as a new money laundering channel. Moreover, there are many different ways to realize money laundering through digital currency. Generally speaking, the probability of new money laundering being found and investigated is lower than before. Many countries have no effective means and technology to combat money laundering through digital currency. These factors lead to criminals prefer this way of money laundering
digital currency is a kind of unregulated and digital currency, which is usually issued and managed by developers and accepted and used by members of specific virtual communities. The European Banking authority defines virtual currency as a digital representation of value, which is not issued by the central bank or authorities, nor linked with legal currency. However, because it is accepted by the public, it can be used as a means of payment, or it can be transferred, stored or traded in electronic form
according to the notice on preventing the financing risk of token issuance, there is no approved digital currency trading platform in China. According to China's digital currency regulatory framework, investors have the freedom to participate in digital currency transactions at their own risk
warm tips: the above information is for reference only. Before investing, it is recommended that you first understand the risks existing in the project, and understand the investors, investment institutions, chain activity and other information of the project, rather than blindly investing or mistakenly entering the capital market. Investment is risky, so we should be cautious when entering the market
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generally speaking, it is a local area network. Internet cafes, campus networks and office networks all belong to this category. In addition, fiber to the building, community broadband, ecation network, cable modem Internet, although the geographical scope is relatively large, but in essence, it is still based on Ethernet technology, so it still belongs to the intranet< How to judge whether I am an intranet or not
you can ask your ISP to see if you are one of the above users. If you dial up every time you surf the Internet, you are not an intranet user. But the situation is not absolute! A more reliable method is to judge by IP address
open the command prompt window (start → run Win9x, enter command.com Win2K, XP, enter cmd.exe), and enter ipconfig at the DOS prompt
the IP address of the machine is displayed in the IP address item
when the IP address is one of the following three forms, you are in the intranet:
10.0.0-10.255.255
172.16.0.0-172.31.255.255
192.168.0.0-192.168.255.255
if you have multiple network connections, as long as one IP does not match one of the above three forms, then you are not in the intranet
Third, I am an intranet, how to improve the speed of BT download
first of all, it is recommended that you upgrade your system to XP. This is because the total bandwidth of the intranet is limited. When the bandwidth is tight, users using Win2K and XP have an advantage over users using Win9x. Secondly, most of BT software consumes system resources. Under Win9x, it is very easy to cause the system to slow down, lose response and even blue screen, while XP based on NT kernel is much better than Win9x in resource management and stability
client software I strongly recommend BitComet
BitComet is a P2P free software based on BitTorrent protocol; Efficient network kernel, multi task download at the same time, still keep little CPU memory occupation; It supports selective downloading of files in a torrent; Disk cache technology can effectively rece the damage of high-speed random read and write to the hard disk; Only one monitoring port is needed to meet all download needs; Automatically save the download status, no need to scan the file again, no need to scan the file for seed; Support multi tracker protocol; Green software, do not need to install, only run-time Association. Torrent file; Multi language interface. Its original name was simplebt. It also supports UPnP automatic port mapping, automatic opening of windows network sharing and firewall port
Run BitComet after installation to open the options dialog box. In the advanced settings item, make sure to select "support tracker's intranet report extension", in the network connection item, select all the options, and in the disk cache item, increase the cache value according to your memory (so as to avoid premature warping of your hard disk)< 4. I've done what I said before. Why not I can't upgrade to XP for some reason)
then you need to do port mapping. If you surf the Internet through proxy server, you can use portmap to do port mapping on the server. Please click here to download portmap
if you use a router, the setting method of each router may be different. So please read the router manual or consult the dealer
this operation enables all kinds of services on LAN to be accessed by Internet
software mapping
winrote Pro is a proxy server software that integrates router, DHCP server, DNS server, NAT and firewall. At the same time, it is also a mail server software that can be applied in LAN. Therefore, it can not only realize that all microcomputers in LAN share an Internet connection (connection mode includes modem, ISDN, xDSL, DDN It can also realize the mail management in LAN and the mail exchange between LAN and Internet
winroute software is very simple to install and use. It only needs to be installed on the server. It is an excellent proxy server software for LAN sharing Internet connection. It can realize reverse proxy function by port mapping, and let the external access some services provided by the internal network protected by Nat
porttunnel means "port channel" in Chinese. Its function is to specify a channel on the server for the client's computer, so that the client can directly establish a connection with the Internet. It must run on the server side to achieve the purpose of port mapping<
port mapping of ADSL
some adsls have built-in proxy function, which enables us to realize multi machine sharing and Internet access without the need of host computer, but it is impossible to access web, FTP and other services from outside network. Next, we use omni-directional ADSL 1680 to realize the service of accessing intranet web service from outside network
access IP address: 10.0.0.2 (this is the default intranet IP address of 1680), the default user name is "admin", and the default password is "qxcommsupport"
click "virtual service" to enter the main interface of port mapping configuration
fill in the "public network port" with the port 80 that we want to open on the Internet, and fill in the "Intranet port" with the port 80 that has been opened on the intranet machine
select whether "port type" is TCP protocol or UDP protocol (for example, TCP is used for web and FTP protocol, and UDP is used for QQ protocol)
finally, add the IP address of the intranet open web service to the "host IP"
broadband router port mapping
Enter "192.168.0.1" (assuming that the IP is a router) in the IE address bar to log in to the router
enter the initial password
click "virtual server / DMZ" to enter the configuration main interface of port mapping
if you want to add a web server, check "HTTP (port 80)" and fill in the last digit of the IP address of the intranet host, enter the port number 80 in "(Port No.)" and click the "save" button below to add a port successfully
in fact, the use of winroute, porttunnel, ADSL and broadband router is very simple. We only need to add different IP addresses and ports to realize various services. Making good use of the mapping function of software and hardware will bring infinite convenience to our application on the network
intranet is the opposite of public network
With the advent of digital currency, the encryption algorithm of currency is becoming more and more important. What are the types of passwords
classical cipher types mainly include transposition cipher and rearrangement of alphabetic order messages. For example, "Hello world" becomes "ehlol owrdl"
Diffie Hellman and RSA algorithms have been widely used except for the first public example of high quality public key algorithms. Other asymmetric key algorithms include Cramer schup cryptosystem, ElGamal encryption and various elliptic curve techniquessome well-known cryptosystems include RSA encryption, Schnorr Signature, El Gamal encryption, PGP and so on. More complex password systems include e-cash system, signcryption system, etc. Now more cryptosystems include interactive proof systems, such as zero knowledge proof, which is used for secret sharing
for a long time, information collection and law enforcement agencies have been interested in cryptography. The importance of secret communication is self-evident. Because cryptography promotes privacy protection, it also attracts great interest of cryptography supporters. Therefore, there is a history of controversial legal issues around cryptography, especially since the emergence of cheap computers makes it possible to widely use high-quality cryptography
nowadays, cryptocurrency transactions are semi anonymous, which makes them very suitable for a series of illegal activities, such as money laundering and tax evasion. However, the proponents of cryptocurrency often attach great importance to the anonymity of digital currency and think that it can protect the privacy of users. Some cryptocurrencies are more private than others
Cryptocurrency is a new type of digital asset, which is based on the network distributed on a large number of computers. This decentralized structure enables them to exist outside the control of the government and central authorities. The term "cryptocurrency" also comes from the encryption technology used to protect the networkblockchain is an organization method to ensure the integrity of digital currency transaction data, and it is an important part of many cryptocurrencies. Many experts believe that blockchain and related technologies will subvert many instries, including finance and law. Cryptocurrencies have been criticized for many reasons, including their use for illegal activities, exchange rate fluctuations and the vulnerability of the infrastructure that underpins them. However, digital currency is also praised for its portability, divisibility, anti inflation and transparency