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TLS and SSL do not fit neatly into any single layer of the OSI model or the TCP/IP model. [4] [5] TLS runs "on top of some reliable transport protocol (e.g., TCP)," [6]: §1 which would imply that it is above the transport layer. It serves encryption to higher layers, which is normally the function of the presentation layer.
This is an accepted version of this page This is the latest accepted revision, reviewed on 24 January 2025. Extension of the HTTP communications protocol to support TLS encryption Internet protocol suite Application layer BGP DHCP (v6) DNS FTP HTTP (HTTP/3) HTTPS IMAP IRC LDAP MGCP MQTT NNTP NTP OSPF POP PTP ONC/RPC RTP RTSP RIP SIP SMTP SNMP SSH Telnet TLS/SSL XMPP more... Transport layer TCP ...
SSL (Secure Sockets Layer) is an industry standard for encrypting private data sent over the Internet. It helps protect your account from hackers and insures the security of private data sent over the Internet, like credit cards and passwords.
In cryptography, X.509 is an International Telecommunication Union (ITU) standard defining the format of public key certificates. [1] X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, [2] the secure protocol for browsing the web.
OpenSSL is a software library for applications that provide secure communications over computer networks against eavesdropping, and identify the party at the other end. It is widely used by Internet servers, including the majority of HTTPS websites.
PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.
In a CA-based PKI system, parties engaged in secure communication must trust a CA, i.e. place the CA certificates in a whitelist of trusted certificates. Developers of web browsers may use procedures specified by the CA/Browser Forum to whitelist well-known, public certificate authorities.
OCSP does not, by itself, perform any DPV of supplied certificates. The key that signs a response need not be the same key that signed the certificate. The certificate's issuer may delegate another authority to be the OCSP responder.