Stands for “Secure Socket Layer.”

SSL is a expertise for authenticating and encrypting knowledge transfers over the Internet. It encrypts knowledge transfers between a consumer’s internet browser and distant internet servers, defending consumer knowledge like login credentials and bank card numbers. SSL was first launched to the general public in 1995 and was changed in 1999 by a successor expertise known as TLS — though the successor is commonly additionally known as SSL.

SSL encrypts knowledge touring over the Internet to guard it from eavesdropping by different units alongside the route. The HTTPS protocol makes use of SSL and TLS to safe common internet visitors, and different protocols for e mail (SMTP and IMAP), VPN connections, and file transfers (FTPS) additionally use it to encrypt and shield knowledge. SSL makes use of authentication certificates (known as SSL certificates) to authenticate the identities of the online server and its proprietor and administrator.

When first launched, SSL was primarily utilized by e-commerce web sites to guard a buyer’s bank card quantity, tackle, and different private data throughout transactions. It was additionally used to obscure the username and password used in the course of the login course of for any website that allowed customers to create accounts. Eventually, many web sites began using SSL encryption for all knowledge transfers between a consumer and server to maintain looking exercise non-public due to incentives by engines like google (who would reward safe websites by putting them larger in search outcomes) and internet browsers (which started labeling websites not using SSL as “not secure”).


SSL expertise was changed in 1999 by the discharge of TLS 1.0. TLS addressed a number of shortcomings and vulnerabilities current in SSL. The first few releases of TLS have been backward suitable with SSL, permitting older internet browsers and web site hosts to proceed working using a decrease stage of safety. TLS 1.2, launched in 2008, lastly eliminated backward compatibility after practically a decade of assist.

TLS improves on the sooner SSL expertise in a number of methods. It streamlined the handshake course of to require fewer steps and velocity up connections. It additionally makes use of more fashionable encryption algorithms like AES and ChaCha20-Poly1305 as a substitute of the older DES and RC4 algorithms utilized by SSL.

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