Cybersecurity Definition Library
Authoritative definitions and structured schema terms covering transport security, OSINT asset mapping, and networking layers.
SSL (Secure Sockets Layer)
A deprecated cryptographic protocol designed to secure communications over a computer network. SSL was superseded by TLS in 1999.
TLS (Transport Layer Security)
The modern cryptographic protocol successor to SSL. It encrypts communication channels to protect data transfer against eavesdropping and tampering.
PKI (Public Key Infrastructure)
A framework of cryptographic keys, digital certificates, rules, and procedures used to verify and manage digital identities on networks.
Cipher Suite
A standardized set of cryptographic algorithms used to establish secure connections, detailing key exchange, bulk encryption, authentication, and integrity check methods.
Subdomain Enumeration
The security assessment process of mapping all child hostnames linked to a primary root domain to discover staging systems or shadow IT.
Certificate Transparency (CT)
An open cryptographic framework requiring Certificate Authorities to log all issued TLS certificates to public, append-only ledgers to prevent spoofing.
Attack Surface Management (ASM)
The continuous process of discovering, analyzing, prioritizing, and securing all internet-facing assets and security gaps in an organization.
Port Scanning
A network discovery method used to send probes to TCP/UDP ports on a target host to identify active listening services and exposure boundaries.
TCP (Transmission Control Protocol)
A core connection-oriented transport layer protocol that guarantees ordered, error-checked delivery of stream data between hosts.
UDP (User Datagram Protocol)
A simple connectionless transport layer protocol that allows fast message transmission without initial handshake establishment or packet delivery guarantees.
Open Port
A TCP or UDP port number configured to accept incoming network connections or packets from external hosts.