Virtual Private Network

Virtual Private Network: Provides an encrypted tunnel over an untrusted network. The control applies to network communicationNetwork CommunicationThe exchange of data between systems over network protocols and connections. or network accessNetwork AccessThe ability of a user, device, or workload to connect to and use network resources.. Effectiveness is achieved through restrictive rules, segmentation, continuous monitoringMonitoringThe continuous observation of systems, identities, networks, and controls for relevant changes., and coordinated response processesResponse ProcessA coordinated sequence of decisions and actions for handling security events and incidents..

How it works and where it fits

Virtual Private Network concerns communication between systems and therefore addressing, protocol state, trust boundaries, and reachable services. Security analysis must look beyond individual packets to direction, session, identity, encryption, and intended purpose. Different network layers introduce their own controls, assumptions, and failure modes.

Practical security relevance

Communication paths should be documented, unnecessary connections prevented, and permitted flows defined as narrowly as practical. Segmentation, secure protocols, authentication, and logging reinforce one another. Monitoring should cover known signatures as well as unusual destinations, volumes, and timing; rule and topology changes belong in a controlled process.

Related concepts

• CryptographyCryptographyMethods for protecting information through encryption, signatures, and hash functions.: Methods for protecting information through encryption, signatures, and hash functions.
• EncryptionEncryptionConverts plaintext into unreadable ciphertext using a key.: Converts plaintext into unreadable ciphertext using a key.
• FirewallFirewallControls network traffic based on defined rules and security policies.: Controls network traffic based on defined rules and security policies.
• Intrusion Detection SystemIntrusion Detection SystemDetects suspicious or anomalous activities on hosts or within networks.: Detects suspicious or anomalous activities on hosts or within networks.