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Transport Layer Security (TLS) is a protocol that lets client and server applications communicate over the Internet through a channel designed to resist eavesdropping, tampering, and message forgery. It establishes the channel with a handshake, then protects application traffic with a record protocol.
How TLS establishes a protected connection
TLS operates between an application protocol and its transport. In its base model, the underlying transport provides a reliable, in-order data stream. The application protocol determines how TLS is started and how the connection’s identity is checked.
The handshake
At the start, the client and server negotiate a TLS version and cryptographic parameters, establish shared keying material, and authenticate the server. Client authentication can also be configured, but it is optional. The handshake must complete successfully before the endpoints use the negotiated keys to protect ordinary application traffic.
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The record protocol
After the handshake, TLS’s record protocol carries application data in protected records. It uses the negotiated parameters and shared keys to provide confidentiality and detect unauthorized changes. The application protocol remains responsible for defining what the exchanged data means.
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What TLS protects—and what it does not
- Authentication: TLS is designed to authenticate the server. Whether a client must also authenticate depends on the application’s configuration.
- Confidentiality: Once the channel is established, TLS protects the content sent through it from being read by outsiders. It does not hide the length of transmitted data; record padding can obscure lengths, but does not eliminate all traffic-analysis information.
- Integrity: TLS is designed to make unauthorized changes to protected traffic detectable.
TLS does not make every application secure or guarantee that every implementation checks identity correctly. The application protocol defines how certificates and identities are interpreted, so secure use depends on correct integration and verification. TLS also does not conceal every observable feature of a connection.
Why TLS early data needs care
TLS 1.3 can support sending some data as 0-RTT early data, before the handshake has fully completed. Early data can be replayed, so it is not suitable for every interaction. The application protocol needs to define which operations are safe to send this way and how replay risk is handled.
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Which TLS specification is current?
The latest TLS 1.3 specification identified here is RFC 9846, an IETF Standards Track document published in July 2026. It obsoletes RFC 8446. The standard describes TLS as designed to prevent eavesdropping, tampering, and message forgery; those are intended protections, not a claim that TLS prevents every attack or hides all communication metadata.
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