Symmetric encryption and asymmetric encryption

1. symmetric encryption-key encryption
Des
Idea
AES
Features: Public algorithms, low computing workload, fast encryption speed, and high encryption efficiency,
Insufficient: insecure
Principle: in symmetric encryption algorithms, only one key is used. Both parties use this key to encrypt and decrypt data. Therefore, the sender must know the encryption key in advance.
2. asymmetric encryption-public key and Private Key
RSA
DSA
Principle: Before communication, the recipient must send the public key that has already been randomly generated to the sender and keep the private key. Since asymmetric algorithms have two keys, they are particularly suitable for Data Encryption in distributed systems.

Symmetric encryption and asymmetric encryption