SSL/TLS encryption protects a connection between two programs so that observers on the path cannot read the content in clear text and a modification does not stay unnoticed.
TLS is the current name of the protocol, SSL the historical predecessor designation.
In everyday speech both often mean the same offer of a protected connection.
Understanding SSL/TLS Encryption
Encryption begins with a handshake in which the parties agree on mechanisms and derive keys, and it continues in protected messages.
A certificate binds the server's key to the name the client requested.
Without that binding the channel might be unreadable and still have been built to the wrong counterpart.
The SSL/TLS Handshake
The SSL/TLS handshake exchanges the supported mechanisms, the random values, and the certificate, and produces the secret of the session from them.
The client checks the name, the validity, and the chain to a trusted party.
If the check fails, a careful application stops before it sends payload.
Digital Certificates and Public Key Infrastructure
Digital certificates and public key infrastructure provide the chain of trust, from the issuing party to the server's certificate.
The client already holds the trusted roots, the intermediate parties are supplied by the server.
A gap, an expired certificate, or a wrong name interrupts this chain on purpose.
Types of SSL/TLS Encryption
Types of encryption in the handshake differ in how the session secret arises and which older mechanisms are still offered.
The actual payload then uses a symmetric mechanism suited to the volume of data.
Operators switch off mechanisms that remain only for compatibility.
RSA Encryption
RSA encryption in the classic handshake uses the server's public key so that the client can transmit a secret that only the holder of the private key can read.
That presupposes that the private key stays uncompromised, including for earlier captures.
Newer agreements produce the secret so that a key which becomes known later does not open old sessions.
Diffie-Hellman and ECDH Encryption
Diffie-Hellman and ECDH encryption let both parties produce a shared secret without that secret itself traveling on the wire.
Elliptic curves are the leaner variant of the same idea.
Together with fresh values per session, a recorded connection stays protected even if the server's long-term key later becomes known.
SSL/TLS and Cybersecurity
For cybersecurity, TLS is the standard channel for the web, mail transport, and many interfaces.
It protects against reading and falsification on the path and, in the usual case, identifies the server.
It does not protect against an application that mishandles the decrypted content, nor against a certificate that is trusted without cause.
SSL/TLS Vulnerabilities and Attacks
Vulnerabilities and attacks aim at old protocol versions, at weak mechanisms, at faults in the implementation, and at the person who clicks through a certificate warning.
The remedy is switching off old versions, current libraries, and an application that does not hide warnings.
A private key that becomes known is replaced, and the related certificates are declared invalid.
SSL/TLS and Privacy
Privacy benefits because contents, searches, and form data do not lie in clear text during transport.
Destinations, times, and volumes can still remain visible, depending on what the connection reveals.
TLS is thus a necessary part of privacy on the path and not a substitute for sparing data processing at the recipient.
Conclusion
SSL/TLS encryption is the handshake, the certificate, and the channel protected afterward between two endpoints.
Modern key agreement and switching off old mechanisms keep the channel sound.
Protection ends where the clear text lies in the application again.