Symmetric cryptography refers to the same secret key that is used when encrypting and decrypting. Unlike symmetric encryption algorithms, asymmetric encryption algorithms require public and private keys. The public and private keys are a pair, and if the data is encrypted with the public key, only the corresponding private key can be decrypted.
Asymmetric encryption is more secure than symmetric encryption. Symmetric encrypted communications both use the same secret key, and if a party's secret key is compromised, the entire communication will be cracked.
Instead of symmetric encryption using a pair of secret keys, one for encryption, one for decryption, and the public key is public, the secret key is self-preservation, in the communication before the need to synchronize the secret key, to avoid the process of synchronizing the private key to steal information from the risk of hackers.
Blockchain 100 Q 60th: What is an asymmetric encryption algorithm?