Differences Between HTTP and HTTPS and How HTTPS Ensures Security
The article explains the key differences between HTTP and HTTPS—including transmission security, connection methods, port numbers, and certificate requirements—and describes how HTTPS uses SSL/TLS, public‑key cryptography, and session keys to guarantee secure data exchange.
HTTP transmits data in plain text, while HTTPS adds SSL/TLS encryption, providing confidentiality, integrity, and authentication.
Transmission security
HTTP: clear‑text, easily readable by eavesdroppers.
HTTPS: SSL/TLS encrypts data between browser and server.
Connection method
HTTP: simple, stateless connection.
HTTPS: built on SSL over HTTP, supports encryption and identity verification.
Port numbers
HTTP uses port 80.
HTTPS uses port 443.
Certificate acquisition
HTTP: no certificate required.
HTTPS: requires a digital certificate from a CA, usually paid.
How HTTPS Guarantees Security
HTTPS relies on the SSL/TLS protocol, which uses public‑key cryptography for the handshake and symmetric keys for data transfer.
Client requests an SSL connection.
Server sends its public key and keeps a private key.
Client encrypts a session key with the public key and sends it.
Server decrypts the session key with its private key.
Both parties use the session key for fast symmetric encryption of the data.
Ensuring the public key is not tampered
The public key is embedded in a trusted digital certificate; if the certificate is trusted, the key is trusted.
Reducing public‑key computation cost
Each session generates a temporary symmetric “session key” for bulk encryption, while the public key is only used to encrypt this session key.
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