Domain Name System Security Extensions

Domain Name System Security Extensions: Protects DNS responses against tampering using cryptographic signatures. This control applies to network communicationNetwork CommunicationThe exchange of data between systems over network protocols and connections. or network access points. 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

Domain Name System Security Extensions 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

• Digital SignatureDigital SignatureCryptographic proof of the authenticity and integrity of digital data.: Cryptographic proof of the authenticity and integrity of digital data.
• Public Key InfrastructurePublic Key InfrastructureA system of certificates, keys, roles, and processes for digital trust relationships.: A system of certificates, keys, roles, and processes for digital trust relationships.
• Cache PoisoningCache PoisoningInjection of false content or mappings into a cache.: Injection of false content or mappings into a cache.
• Certificate PinningCertificate PinningSpecification of expected certificates or public keys for a connection.: Specification of expected certificates or public keys for a connection.