CYBERSECURITY GLOSSARY Malware and viruses CYBERSECURITY GLOSSARY Attacks and techniques CYBERSECURITY GLOSSARY Detection and response CYBERSECURITY GLOSSARY Identity and access CYBERSECURITY GLOSSARY Cloud and infrastructure CYBERSECURITY GLOSSARY Compliance and management CYBERSECURITY GLOSSARY Continuity and metrics CYBERSECURITY GLOSSARY Privacy and OSINT CYBERSECURITY GLOSSARY Cybersecurity
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Hash

A hash is a fixed-length fingerprint calculated from any piece of data (a file, a password, a message) with a one-way mathematical function: the original data can't be recovered from the hash. It's used to store passwords without keeping them in plain text and to check that a file wasn't altered.

Related term in this glossary: Brute force attack

hash function, cryptographic hash, file checksum, SHA-256, MD5

Related terms

Authentication vs. authorization

Authentication confirms that you are who you say you are (a password, a fingerprint, a verification code); authorization decides what you can do once you're in (view, edit, approve). A secure system needs both: signing in with a verified identity and doing only what your role allows.

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Domain controller (Active Directory)

A domain controller is the server that manages the accounts, passwords and permissions of every user and device on a Windows network through Active Directory. It's the most sensitive asset in a company, because whoever controls it controls every account and every computer on the domain.

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RBAC (role-based access control)

RBAC (role-based access control) is the model that assigns permissions to roles (accountant, salesperson, administrator) and has each user inherit the permissions of their role. Onboarding a new hire or moving someone to a new position means changing their role, without handing out permissions one by one.

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MFA (multi-factor authentication)

Multi-factor authentication (MFA) asks for two or more proofs of identity to sign in: something you know (a password), something you have (a phone or security key) or something you are (a fingerprint). It stops most sign-ins made with stolen passwords.

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Zero trust

Zero trust is a security model in which no user, device or connection is trusted just for being inside the network. Every access is explicitly verified and granted with the least privilege needed, and it's checked again continuously.

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