Can you explain how the HTTPS protocol works and how it ensures data transmission security?

HTTPS (HyperText Transfer Protocol Secure) is an extension of HTTP that uses the TLS/SSL protocol to encrypt data between the client and the server.

Working mechanism:

1. The client (browser) initiates a connection to the server via HTTPS.
2. The server sends its digital certificate, confirming its identity, issued by a trusted certification authority (CA).
3. The client verifies the certificate, ensuring it is valid and belongs to the correct server.
4. After verification, a secure communication channel is established using the TLS protocol, which employs symmetric encryption for data transfer.
5. All data transmitted between the client and the server is encrypted, protecting it from interception and tampering.

Thus, HTTPS provides:

• Confidentiality (data encryption)
• Integrity (protection against data modification)
• Server authentication (certificate verification)

Example: When entering a password on a website with HTTPS, the data is encrypted and cannot be read by malicious actors during traffic interception.