The significance of data signature

when the client communicates with the server, the message is encrypted, and then the message is signed. The information on this signature network is all about preventing the message from being modified, but I am thinking about a question. If the message is cracked and modified, and it can be re-encrypted, the signature can also be re-signed. What is the significance of this signature?


signature to private key, without private key can not be signed
signature verification depends on public key, public key


asymmetric encryption means that even if a ciphertext is cracked, the attacker cannot push the private key back through the public key and ciphertext, thus ensuring the security of the entire encryption system (that is, other ciphertexts generated by the encryption system still cannot be cracked). It is different from Julius Caesar's password that all ciphertexts can be deciphered by statistical word frequency ~

Menu