Core cybersecurity principles, common threats, and key defenses.
Confidentiality
Keeping data secret from unauthorized people.
Integrity
Keeping data accurate and unchanged unless authorized.
Availability
Keeping systems and data accessible when needed.
Data breach
Unauthorized access or exposure of private data.
Tampering
Unauthorized modification of data or files.
DDoS attack
Flooding a service with traffic to make it unavailable.
Encryption
Scrambling data so only authorized users can read it.
Access control
Rules that limit who can view or change resources.
Backups
Saved copies of data used to restore after loss or attack.
Audit trail
A record of who did what and when in a system.
CIA Triad
The three core goals of security: keep data secret, accurate, and reachable.
Secrecy
Only approved people can see the information.
Accuracy
Information stays correct and unchanged unless authorized.
Uptime
Systems and data are ready when users need them.
Breach
An unauthorized person gets access to protected information.
Data tampering
Someone alters information without permission.
Service flood
Too much traffic overwhelms a system so real users cannot get in.
Access rules
Policies that limit who can view or change resources.
File hashing
A check that detects whether data has been changed.
Redundant storage
Extra copies or systems that keep services running after failure.