HTTP and HTTPS
Tags: http, https, api, ssl
Published: 2023-02-21 05:15:21

##HTTP (Hypertext Transfer Protocol) and HTTPS (Hypertext Transfer Protocol Secure) 
are both protocols used for transmitting data over the internet. The main difference between them is that HTTPS uses encryption to protect the data being transmitted, while HTTP does not.

HTTP is used for transmitting data between a web server and a client, such as a web browser. However, because HTTP is not encrypted, any data that is transmitted can be intercepted and read by anyone who has access to the network, such as hackers or malicious software.

HTTPS, on the other hand, uses encryption to protect the data being transmitted. This encryption is achieved through the use of SSL/TLS (Secure Sockets Layer/Transport Layer Security) protocols. When a website uses HTTPS, the data being transmitted between the client and server is encrypted and can only be read by the intended recipient.

To illustrate this difference, imagine you are sending a message to someone through a postcard. Anyone who sees the postcard can read the message. This is similar to using HTTP, where anyone who has access to the network can see the data being transmitted. Now imagine sending the same message in an envelope that has been sealed with a lock. Only the intended recipient can open the envelope and read the message. This is similar to using HTTPS, where the data being transmitted is encrypted and can only be read by the intended recipient.

Using HTTPS is important for websites that transmit sensitive information, such as login credentials or payment information. Without HTTPS, this information can be easily intercepted and stolen. In addition, HTTPS helps to verify that the website being accessed is legitimate and has not been tampered with.

For example, when you visit a website that uses HTTPS, you will see a padlock icon in the address bar of your web browser. This indicates that the connection is secure and that the data being transmitted is encrypted. You may also see the website's domain name highlighted in green, indicating that it has been verified by a trusted certificate authority. This helps to ensure that you are visiting the legitimate website and not a fraudulent one.

## How does HTTPS works
HTTPS, or Hypertext Transfer Protocol Secure, is a protocol for secure communication over the internet. It is essentially the same as HTTP, the protocol used for standard web communication, but with an added layer of encryption to protect the data being transmitted.

Here is a high-level overview of how HTTPS works:

Client initiates a connection: When a client, such as a web browser, wants to access a website that uses HTTPS, it initiates a connection to the server using the HTTPS protocol.

Server sends its SSL/TLS certificate: Once the connection is established, the server sends its SSL/TLS certificate to the client. This certificate contains the server's public key, which will be used to encrypt data sent to the server.

Client verifies the certificate: The client verifies that the certificate is valid by checking its digital signature against a trusted certificate authority (CA). If the certificate is valid, the client generates a symmetric session key to encrypt data for the duration of the session.

Server sends its public key: The server sends its public key to the client, which is used to encrypt data sent from the client to the server.

Data is encrypted and transmitted: Once the session key and public key have been exchanged, all data transmitted between the client and server is encrypted using the session key.

Session ends: When the session ends, the session key is discarded and a new key is generated for the next session.

Overall, HTTPS ensures that the data being transmitted between the client and server is encrypted and secure from interception or tampering by unauthorized parties.


##How HTTPS makes APIs secure?
HTTPS provides a secure way to transmit data between a client and a server, including APIs. By using HTTPS to secure API requests, you can help prevent attackers from intercepting or tampering with the data being transmitted.

When a client makes a request to an API over HTTPS, the request is encrypted using SSL/TLS protocols. This means that even if an attacker intercepts the request, they won't be able to read the data being transmitted. In addition, HTTPS provides integrity checks that help ensure that the data has not been tampered with during transmission.

Another important aspect of API security is authentication and authorization. HTTPS can be used in conjunction with other security mechanisms, such as OAuth 2.0, to help ensure that only authorized clients can access the API. For example, a client may be required to provide a valid access token in order to make API requests.

In addition, HTTPS can help protect against man-in-the-middle attacks, where an attacker intercepts API requests and sends fake responses to the client. By using HTTPS, the client can verify the authenticity of the server, ensuring that the response is coming from the intended source.

Overall, using HTTPS to secure APIs is an important part of overall API security. By encrypting data, providing integrity checks, and verifying server authenticity, HTTPS helps to ensure that API requests are secure and that sensitive data is protected from attackers.