Digital envelope understanding

Server: holds the public key and key

Client: Hold the DLL and Public Key provided by the server, the string to be encrypted (A), and the client's own encrypted string (1234)

Client process:
1. The client encrypts a + 1234 through symmetric encryption to obtain 1A
2. The client encrypts the 1234 + Public Key into [DLL] to obtain 1B.
3. Upload the client to the server using 1A + 1B.

Server process:
1. The server uses the 1B + private key to get 1234
2. Log Service decrypts A through symmetric decryption through 1A + 1234
3. The server obtains [data] + 1234 and returns the data to the client through [symmetric encryption] = encrypted

 

Digital envelope understanding