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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The user has sent too many requests in a given amount of time. Intended for use with rate-limiting schemes. [24] 431 Request Header Fields Too Large (RFC 6585) The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large. [24] 451 Unavailable For Legal Reasons ...

  3. HTTP Public Key Pinning - Wikipedia

    en.wikipedia.org/wiki/HTTP_Public_Key_Pinning

    The HPKP policy specifies hashes of the subject public key info of one of the certificates in the website's authentic X.509 public key certificate chain (and at least one backup key) in pin-sha256 directives, and a period of time during which the user agent shall enforce public key pinning in max-age directive, optional includeSubDomains ...

  4. TLS termination proxy - Wikipedia

    en.wikipedia.org/wiki/TLS_termination_proxy

    Incoming HTTPS traffic gets decrypted and forwarded to a web service in the private network. A TLS termination proxy (or SSL termination proxy, [1] or SSL offloading [2]) is a proxy server that acts as an intermediary point between client and server applications, and is used to terminate and/or establish TLS (or DTLS) tunnels by decrypting and/or encrypting communications.

  5. Handshake (computing) - Wikipedia

    en.wikipedia.org/wiki/Handshake_(computing)

    When a Transport Layer Security (SSL or TLS) connection starts, the record encapsulates a "control" protocol—the handshake messaging protocol (content type 22). This protocol is used to exchange all the information required by both sides for the exchange of the actual application data by TLS.

  6. Heartbleed - Wikipedia

    en.wikipedia.org/wiki/Heartbleed

    Heartbleed is a security bug in some outdated versions of the OpenSSL cryptography library, which is a widely used implementation of the Transport Layer Security (TLS) protocol.

  7. Certificate revocation - Wikipedia

    en.wikipedia.org/wiki/Certificate_revocation

    This is a trade-off between security and availability: failing-soft allows downgrade attacks, while failing-hard allows denial of service (from attacks) or causes unavailability. [ 18 ] An attacker with the ability to present a compromised certificate likely also has the ability to prevent the client performing an online revocation status check ...

  8. Transmission Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Transmission_Control_Protocol

    Transport Layer Security (TLS) requires a handshake of its own for key exchange at connection establishment. Because of the layered design, the TCP handshake and the TLS handshake proceed serially; the TLS handshake cannot begin until the TCP handshake has concluded. [113] Two RTTs are required for connection establishment with TLS 1.2 over TCP ...

  9. Application-Layer Protocol Negotiation - Wikipedia

    en.wikipedia.org/wiki/Application-Layer_Protocol...

    Application-Layer Protocol Negotiation (ALPN) is a Transport Layer Security (TLS) extension that allows the application layer to negotiate which protocol should be performed over a secure connection in a manner that avoids additional round trips and which is independent of the application-layer protocols.