Symmetric encryption & asymmetric encryption

Features of symmetric key cryptography algorithms:

The algorithm is simple and the encryption/Decryption speed is fast, but the key management is complicated and it is not convenient for digital signatures;

Features of Asymmetric Key Cryptography algorithms:

The algorithm is complex, the encryption/Decryption speed is slow, and the key management is simple. It can be used for digital signatures.

 

So combine the two to formHybrid EncryptionMethod. That is:

The sender encrypts the plaintext with a symmetric encryption algorithm and sends it to the receiver. Then, the symmetric encryption key is encrypted with the receiver's public key to the receiver.

Use your own private key to decrypt the symmetric encryption key to decrypt the plaintext.

 

Symmetric encryption & asymmetric encryption