Can Ethereum's public key push out its private key

1. If it's lost, it's better to post the lost advertisement

3. Now many symmetric encryption algorithms generate a key pair, which is the public key and private key you asked ~
generally speaking, the public key is used for encryption ~ the private key is used for decryption ~
the private key is public, which is used in the client ~ and the public key is confidential ~
for example ~
a serial number 5 can be obtained from the user name a and public key 3, The serial number 5 can be decrypted into a,
in this way, it is easy to verify the legitimacy of the serial number, and will not lose the Secret ~
the determination of 3 and 2 is done by some special functions. There is a certain relationship between them. 3 can easily dece 2, but 2 can hardly dece 3 ~

this is the general meaning~

4. Public key and private key are a pair of keys (i.e. a public key and a private key) obtained by an algorithm, one of which is called public key; The other one is reserved by itself, which is called private key. The key pair obtained by this algorithm can be guaranteed to be unique in the world. When using this key pair, if one key is used to encrypt a piece of data, the other key must be used to decrypt it. For example, if you encrypt data with public key, you must decrypt it with private key. If you encrypt data with private key, you must decrypt it with public key, otherwise decryption will not succeed.

5. 1. First of all, we need to distinguish the two basic concepts of encryption and authentication
encryption is to encrypt data, so that even if illegal users get encrypted data, they can not get the correct data content, so data encryption can protect data and prevent monitoring attacks. It focuses on the security of data. Identity authentication is used to judge the authenticity of an identity. After the identity is confirmed, the system can give different permissions according to different identities. It focuses on the authenticity of users. The emphasis of the two is different< Secondly, we need to understand the concept and function of public key and private key
in the modern cryptosystem, encryption and decryption use different keys (public key), that is, asymmetric key cryptosystem. Each communication party needs two keys, namely public key and private key, which can be used to encrypt and decrypt each other. The public key is public and does not need to be kept secret, while the private key is held by the indivial himself and must be kept and kept secret. Principle of public key and private key: one public key corresponds to one private key. Key pair, let everyone know is the public key, do not tell you, only their own know, is the private key. If one of the keys is used to encrypt data, only the corresponding key can be decrypted. If one of the keys can be used to decrypt data, the data must be encrypted by the corresponding key.

6.

First of all, cracking RSA means ciphertext - & gt; The process of plaintext

Suppose plaintext m, ciphertext C, private key D, public key e, RSA encryption process is as follows:

1, two large mutually unequal prime numbers P and Q

2, n = P * q

3, FN = (P - 1) * (Q - 1)

4, e and FN are mutually prime, and 1 & lt; e < FN

5, D satisfies de% FN = 1

6, encryption and decryption:

C = (m ^ E)% n

m = (C ^ D)% n

the above formula can be understood as encryption by public key and decryption by private key

the first case : the plaintext and public key are known to get the ciphertext encrypted by the private key. This is the encryption process, which has little to do with the private key D. the encryption process mainly depends on the value of n

suppose that there are countless kinds of plaintext m, public key e, private key D and ciphertext C

in the second case, : the private key is obtained by knowing the plaintext ciphertext and public key

given plaintext m, ciphertext C and public key e, find private key D, and insert the secondary formula: C = (m ^ E)% N, the value of n is not unique, so the value of private key D is not unique

when there are correct answers for comparison, I feel that the second situation is easier to find out

personal opinions, welcome to discuss

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9. This is very simple. If the password is entered manually, it is completely OK in theory, but sometimes the key is binary, sometimes hundreds of bits will be converted to other bases. It is very easy to make mistakes, and the private key is manually entered from one to another. How can you ensure that the public key and private key you enter can be configured into a pair of keypairs, and the public key and private key must be changed from p q If manual input is too troublesome

why don't we encapsulate these tedious and error prone things to simplify our development
so we have all kinds of development packages, all kinds of architectures, all kinds of libraries

in Java
keypairgenerator keygen = keypairgenerator. GetInstance (& quot; RSA");< br />KeyPair key = keyGen.generateKeyPair(); < br /> cipher.init(Cipher.ENCRYPT_ MODE, key.getPublic());< br /> cipher.init(Cipher.DECRYPT_ MODE, key.getPrivate());
this is a fragment of the code I wrote before. It is not continuous. In general, I get a RSA key pair and then call getpublic ()
getprivatekey () to get the public and private key.

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