Quantum hegemony of bitcoin

1. In a few decades, if quantum computers become popular, bitcoin will lose its value. Because quantum computers are too fast in some algorithms, traditional computer cryptography will be challenged (bank passwords, blockchain currencies...). It takes tens of thousands of years for traditional computers to crack bank codes, while quantum computers only take one second, Bitcoin is nothing more than that.

2. First of all, let's talk about the background. The basic principle of bitcoin "account" is key public key address. You can roughly understand it as "key box box number". Now is to start from the box number or box to crack the key
there are basically two kinds of attacks, one is dictionary attack, the other is brute force attack
dictionary attack is to use common passwords and their simple variants as keys one by one. As long as your pass phrase is not hard enough, the possibility of successful attack is very high. So if you want to use this, you need to popularize the knowledge of cryptography first, and don't think it's very safe to add a long password
if you don't use the wallet generated by pass phrase, you can only crack it violently, which is equivalent to enumerating all the possible keys. At present, this is impossible, even if the electronic computer is becoming more and more powerful. However, quantum computer can do it theoretically, but don't worry too much. If such a powerful quantum computer comes out, it will not only endanger bitcoin
at the same time, bitcoin has a second layer of protection: if an address only accepts bitcoin but does not output it, its public key is confidential, that is to say, no one else can see the box, only the box number. At present, the process of decing the box from the box number can't even be done by quantum computer. In other words, if there is a quantum computer, bitcoin has a last line of Defense: it's temporarily safe to transfer your money to a new address
finally, some time ago, the wallet generated by the Android client was attacked because of a bug in the underlying random number generator. In fact, this function is not random securerandom, which Google quickly admitted and fixed. It's hard to say whether this kind of thing will happen again, but I don't think we need to worry too much.

3. How can I not show you my mother but still prove that my mother is my mother
zero knowledge proof is a technology that the verifier can make the verifier believe a certain conclusion is true and credible without providing the verifier with the information itself. At present, the anonymous transaction of zcash, a digital asset with outstanding anonymity, is realized by "zero knowledge proof"
for example, a has to prove to B that he has the key to a room. Suppose that the key can only be used to open the lock of the room, but no other method can. At this time, a can choose to give the key to B, and B can use the key to open the lock of the room, so as to prove that a has the correct key of the room
or a opens the room with the key, takes an object out of the room and shows it to B. B knows that the object is only in the room. The principle of method two is zero knowledge proof
zero knowledge proof can prove that I know the secret without disclosing the information itself, and can effectively solve many verification problems.

4. Theoretically, it can be cracked, but it's just a time-consuming problem. If you think about the cost of mining, you should know the difficulty of cracking. To protect bitcoin by means of encryption must make the cracker pay a much higher price than mining, otherwise everyone can get it by cracking rather than mining

5.

Liu Tao and Wang Ke are also bumpy along the way, which is not easy. Liu Tao and his wife are pushed to the top of the storm by public opinion

so if this incident is true or false, some netizens love Liu Tao. If it is true, how can Liu Tao turn over? It seems that Liu Tao is doomed to twists and turns

Dear friends, what's your opinion on this? Welcome to leave a message

6.

Since the birth of bitcoin in 2009, the first price to buy bitcoin in 2010 was about US $0.0025. At a price of $27000, bitcoin has risen 10.8 million times since its birth< In other words, the original investment of RMB 1 can buy 61.3 bitcoins, and the current position value is RMB 10.8 million even with bitcoin's amazing growth, Citibank recently announced a target price of $300000, which is 11 times the current price

Although centralized trading has many fatal disadvantages. 100% of the existing currencies and banks in the world are issued or abandoned by the National Central Bank, and ordinary people cannot participate in the issuance of currencies and banks or the central bank accounts. If the Central Bank continues to issue money silver, it will continuously dilute people's money silver and rece the purchasing power of money silver. It's not shocking at all. This has happened in some countries in the world. Take Zimbabwe as an example. In recent years, the government issued a large number of currency and silver, which led to the collapse of Zimbabwe's economy. Finally, the US dollar had to be introced into the local legal currency and silver< Economists are considering replacing bitcoin in Zimbabwe