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Cybersecurity glossary

The words that keep coming up in IT security, explained simply.

Agent
Lightweight software installed on a device that applies security rules and reports its status to a console.
Patch
An update released by a vendor to fix a defect, often a security flaw.
DNS
The Internet's directory, which translates a site name into an address. Filtering it makes it possible to block a dangerous site before any connection.
DoH and DoT
Encrypted DNS, over HTTPS or TLS, so that queries cannot be read or altered along the way.
EDR
Endpoint detection and response: collecting events, detecting suspicious behaviour and taking response actions.
Payment fraud (BEC)
An email scam in which the attacker poses as a manager or supplier to obtain a payment.
MSP (managed service provider)
A provider that manages the IT, and often the security, of several client businesses.
NGAV
Next-generation antivirus, which combines signatures, rules and machine learning.
NIS2
A European directive that requires cybersecurity measures from many organisations. Software can contribute to it, but cannot be enough on its own to comply.
PEDM
Privilege elevation and delegation management: granting administrator rights only when they are needed.
Phishing
An attempt to obtain credentials or a payment by imitating a trusted service.
Quarantine
Isolating a suspicious file so that it can no longer run, with the option of restoring it.
Ransomware
Malicious software that encrypts files and demands a ransom to restore them.
GDPR
The European regulation on the protection of personal data.
Sigma
An open format for detection rules, shared by the security community.
Typosquatting
Registering a domain name close to a well-known brand to deceive visitors.