What is cyber security?
Cyber security is the set of measures that protect digital information, systems and assets from cyber threats — preserving their confidentiality, integrity and availability (Australian Government definition).
Why it matters
- Protect personal and financial details — name, address, bank account, Medicare number.
- Prevent identity theft — someone using your details to take out loans or services in your name.
- Keep your data and systems intact — attackers should not be able to alter or delete your files.
- Avoid money loss and reputation damage from a compromised email or social account.
Four main threat categories
- Malware — software that secretly enters a device to steal information or take control.
- Phishing — fake emails, SMS or websites that trick you into giving up passwords or banking details.
- Ransomware — software that locks your files and demands a ransom to unlock them.
- DDoS — flooding a website with traffic to take it offline. Affects services more than individuals directly.
2023–24 in Australia (cyber.gov.au)
Over 87,400 cybercrime reports — roughly one every 6 minutes. The ASD cyber security hotline handled 36,700+ calls. Average financial loss per individual: $30,700, up 17% year on year. The most reported categories for individuals: identity fraud (26%), online shopping fraud (15%), online banking fraud (12%).
Five habits that block most attacks
- Turn on multi-factor authentication (MFA) on important accounts.
- Use long, unique passphrases — different one per site.
- Keep devices and apps updated automatically.
- Back up important data regularly to an external drive or trusted cloud.
- Be alert to phishing emails and SMS — do not click links you did not expect.