LBC cracking bitcoin key

1. In order to make it easier for new people to understand, sister coin will use some metaphors. Although she is not strict, she will understand better
the private key is like your bank card password
the address of bitcoin wallet is like your bank card
as long as you have the bank card and password, anyone can withdraw money from ATM
the address of bitcoin wallet is public, which means that everyone else has your bank card, so your bank card password (private key) becomes very important at this time
once your key is disclosed, others can transfer your bitcoin

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2.

The private key of bitcoin wallet cannot be viewed online. Bitcoin exists on the platform. To download core or classic is the real wallet, and then you can view it

[description of private key of bitcoin wallet]:

1. Wallet encryption refers to automatically encrypting and storing the wallet with private key. The official bitcoin client supports wallet encryption since version 0.4.0. The encrypted wallet will prompt you to enter your password every time you pay. If the password is wrong, the client will refuse to pay

2. If you replace it with the earliest backup wallet (wallet. DAT), you can still trade normally. Considering the principle of bitcoin, it can be concluded that as long as there is a private key (wallet), you can prove that you are the legitimate owner of the wallet. No matter whether you encrypt or delete the wallet (the core is the private key corresponding to an address), you can't deny it

3. When backing up the bitcoin wallet, you should also pay attention to the existence of bitcoin payment change mechanism (for example, if you send 50 BTC in a complete 100 BTC to an address, the system will send 50 BTC to the other party's address, and return 50 BTC to a new address of your client, which will not be directly displayed in your address list)

4. After sending bitcoin to other addresses 100 times or using 100 different addresses to receive bitcoin, please back up your wallet again, otherwise the returned and received bitcoin will be lost forever. In addition to encrypting wallets, users can also generate offline paper wallets and brain wallets

3. API keys are used to program transactions. One time password, with Google verifier. Download Google verifier to your mobile phone and install it. Scan the two-dimensional code with a verifier to get a one-time password. studybtc

4. 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.

5. Common measures to deal with the loss of private key and password:
1. Delete the wallet by mistake
this is the same operation as I do. What should I do in case of this kind of thing? In fact, as long as you remember the private key, download a wallet again, import the private key and reset the password of the wallet
2. The mobile phone is missing or broken
if your mobile phone is stolen or broken, as long as the private key or mnemonic word is still there, you can download a wallet again, import the private key (or mnemonic word) and recreate the wallet
3. The private key is forgotten, but the mnemonic (or JSON file) is still there
if your private key is lost, but the mnemonic (or JSON file) is still there, don't worry, mnemonic can help you retrieve the private key,
4. The private key is forgotten
the wallet hasn't been deleted. If your private key is forgotten, but the wallet is still on your mobile phone, it's very easy to do, You just log in with your password, enter your wallet, and back up your private key
5. The private key, password and mnemonic words have been lost
sorry, no one can help you
6. Forgotten password or wrong input
this is the same as some other apps that we usually log in. If we forget password or input error several times, click forget password to retrieve it. Back to the decentralized wallet, we need to use the private key or mnemonic words to import the wallet to reset the password
7. Forget the mnemonic words
import the wallet with the private key and back it up again
8. Keystore forgotten
if your wallet is not deleted, this is the same way as if your private key is forgotten but your wallet is not deleted, that is, log in with your wallet password and make a new backup; But if your wallet is deleted, that is, it is unloaded, you need to import the wallet with mnemonic words or private key to backup the keystore again!

6. No, there are several reasons why bitcoin was stolen
1. A stolen bitcoin can't be retrieved, and if it's lost, it's lost.
2. Bitcoin has transaction records, but the address is hidden, and you can't find an indivial.
3. Every bitcoin has a key, and only if you have this key can you be admitted to own bitcoin. However, if bitcoin is stolen or lost, your bitcoin will disappear completely
therefore, the theft of bitcoin does not belong to cracking, it may be e to internal personnel.

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8. Bitcoin
private key
is a 256 bit
random number
, which is generated by SHA-256 algorithm