Secure Sockets Layer (SSL) is the historical name for a set of client-server communication protocols designed to protect data in transit. SSL has been replaced by Transport Layer Security (TLS): SSL version 3.0 is obsolete and must not be used. Today, “SSL” often survives in phrases such as “SSL certificate,” even when the connection uses TLS.
What does Secure Sockets Layer mean?
Secure Sockets Layer, abbreviated SSL, was designed to help a client and server communicate securely. In its historical specification, SSL 3.0 aimed to provide privacy through encryption, detect message tampering through integrity checks, and authenticate communicating peers. The protocol’s original purpose and design are documented in RFC 6101.
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In everyday use, a client might be a web browser and a server might host a website. SSL was intended to protect information exchanged between them while it travelled across a network; it was not a general guarantee that a website, company, or device was trustworthy.
Is SSL still used today?
SSL is a historical protocol, not a safe choice for a modern secure connection. SSL 3.0 is deprecated: RFC 7568 states, “SSLv3 MUST NOT be used.” RFC 9325 likewise says implementations must not negotiate SSL versions 2 or 3.
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Transport Layer Security (TLS) is SSL’s successor protocol family. For secure client-server communications, systems should use TLS configured according to current standards guidance—not enable SSL for compatibility. SSL and TLS are related historically, but they are not interchangeable names for the same protocol version.
What is an “SSL certificate”?
“SSL certificate” is common legacy wording for a certificate used with a secure website connection that generally uses TLS today. The certificate is not the SSL protocol itself: a certificate and the protocol configuration are separate parts of a secure connection. Having a certificate does not make obsolete SSLv3 safe or appropriate to enable.
The glossary entry for the term appears in the RFC 2828 Internet Security Glossary. The important distinction is between the historical protocol called SSL and the informal modern label “SSL” that may appear in product or website settings.
Why do people still say SSL?
The name persists in familiar phrases such as “SSL certificate” and “SSL settings,” even though modern secure connections use TLS. When you encounter the term, check what the setting or service actually configures: the relevant question is whether it uses supported TLS versions, not whether something is marketed or labeled “SSL.” For deployment choices, consult current standards recommendations such as RFC 9325.
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Protocol recommendations can be specific to a use case. For example, RFC 8997 updates guidance for TLS versions in email submission and access; recommendations for that context should not automatically be treated as universal configuration advice.
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