Can you explain what is meant by the method of symmetric encryption of data?

Symmetric encryption method involves using the same key for both encrypting and decrypting data.

This means that the sender and receiver must share a secret key that is kept secure. Examples of symmetric encryption algorithms include AES, DES, Blowfish.

The advantage of this approach is high speed of encryption and decryption. The disadvantage is the need to securely transmit and store the key, as key compromise leads to loss of security.

Example: if Alice wants to send Bob an encrypted message, she encrypts it using the shared key, and Bob decrypts it with the same key.