HTTPS

🎬 This chapter has a 10:53 video: Network Protocols →

Look at the address bar when you log in to a bank or a school portal. It starts with https:// and shows a small padlock. That one extra letter, S, is what keeps your password to yourself.

1What HTTPS is

HTTPS

HTTPS stands for HyperText Transfer Protocol Secure. It is the secure version of HTTP: it encrypts the data travelling between the web browser and the web server, using SSL (Secure Sockets Layer), so nobody in between can read it.

Encrypt means scramble the data with a secret key so it looks like nonsense. Only someone with the key can turn it back (decrypt it). On its way from your laptop to a web server, data passes through the Wi-Fi, your ISP and many routers. With plain HTTP, any of them could read it.

Who else can read it?

Switch between HTTP and HTTPS, then play the story. Drag sideways to turn.

Press ▶ Play to send the same login over HTTP, then switch to HTTPS and compare.

The scrambled text is a picture of encryption, not the real thing. Real HTTPS encrypts with TLS (earlier SSL), and what an eavesdropper sees looks like random bytes.

2HTTP vs HTTPS

	HTTP	HTTPS
Full form	HyperText Transfer Protocol	HyperText Transfer Protocol Secure
Data on the way	Plain text — anyone in between can read it	Encrypted with SSL/TLS — unreadable in between
Address starts with	http://	https:// and a 🔒 padlock
Use it for	Pages with nothing private	Logins, payments, anything private — today, almost every site

A postcard and a sealed letter

HTTP is a postcard: every postman who handles it can read what you wrote. HTTPS is a letter in a locked box, and only the person you sent it to has the key.

SSL or TLS?

CBSE’s marking scheme says HTTPS uses SSL. SSL was replaced long ago by TLS (Transport Layer Security), a newer and stronger version of the same idea, and HTTPS today uses TLS. People still say “SSL” out of habit. In the exam, either answer is right.

3From the board papers

How is http different from https?CBSE sample paper 2023-24 · “one difference between HTTP and HTTPS”, compartment exam 2025

1 mark

▶Show the answer

HTTPS (HyperText Transfer Protocol Secure) uses SSL to encrypt data sent over the Internet, so it gives secure browsing; HTTP sends data unencrypted and does not. — CBSE’s marking scheme answer, in short.

Write the full form of HTTPS.CBSE compartment exam 2023 (with XML)

1 mark

▶Show the answer

HyperText Transfer Protocol Secure.

4Check yourself

Quick Check

Someone on the same café Wi-Fi captures a password sent to a site. When can they read it?

Quick Check

What does the S in HTTPS stand for?

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