SSL and TLS Encryption Meaning

SSL (Secure Sockets Layer) and its more modern successor, TLS (Transport Layer Security), are the cryptographic protocols that secure communication over a computer network. When you see the Lock icon in your browser and a URL starting with HTTPS, you are using TLS.

In fintech, this is the essential layer that protects your credit card numbers, passwords, and API keys from being intercepted while traveling between your computer and a bank or exchange.The protocol works through a Handshake where the server and client agree on a Symmetric Key for the session. The server provides a Digital Certificate (issued by a trusted Certificate Authority) to prove its identity.

Once the secure tunnel is established, all data passing through it is encrypted, meaning that even if a hacker sniffs the data at a public Wi-Fi hotspot, they will only see unreadable gibberish rather than your sensitive financial information.While TLS protects data in transit, it does not protect data at rest (stored on a server) or protect against a compromised user device. In the crypto world, TLS is the standard for communication with centralized exchanges (CEXs).

However, for decentralized applications (dApps), the security model is different: while the web interface uses TLS, the actual Transaction Security is provided by the blockchain's own Elliptic Curve cryptography, meaning your funds are safe even if the dApp's web server is compromised.