At a glance
Hacking is when someone gains access to a computer, device or account without permission. It can happen to anyone, at any time. Hackers may try to steal your personal information, take control of accounts or devices, or cause intentional damage to systems. It’s important to understand how hacking can happen and how to reduce its likelihood.
If you think you’ve been hacked, refer to our guide on how to recover.
What is hacking
Hacking is when a cybercriminal gains access to your device, system, network or accounts. They may do this to steal money or information, cause harm or prove they can break into a system.
Cybercriminals may use harmful software, known as malware, to access your device or system. Malware can spread through suspicious links and attachments.
Once a hacker gets in, they can:
- change how your network or system works
- steal your data
- access your passwords
- get your credit card details
- watch what you do online
- pretend to be you online
- install malware onto your devices or system
- lock you out of your account or device.
Warning signs of hacking
You may have been hacked, or someone is trying to hack you, if you:
- are suddenly logged or locked out of your account or device
- notice emails or messages you didn’t send or delete
- have people say they’re getting unusual messages from your account
- notice files, settings or accounts details have changed without your permission
- notice logins, locations or devices you don’t recognise
- receive a login request you didn’t try to make
- receive alerts about activity or payments you didn’t make
- see unfamiliar programs, toolbars or icons on your device
- can’t access your files or data
- have a device that becomes unusually slow, overheats or shows unexpected error messages.
How to prevent being hacked
Even the most secure devices, software and accounts can still be hacked, but there are ways to reduce your risk.
- Where possible, use a passkey. Passkeys are a more secure way to log in to your online accounts than using passwords.
- Where passkeys are unavailable, use strong, unique passwords for all accounts and devices. Avoid reusing them. Learn how to create a strong password.
- Turn on multi-factor authentication (MFA). MFA is when you need 2 or more different ways to verify you are the account owner before you can log in. Learn more about MFA.
- Keep your devices, applications and operating systems up to date. Updates usually include security updates, which protect you from cyber attacks. Learn how to update your device.
- Back up your information and data regularly. A backup makes it easier to restore your information and data, in case you’re hacked. Learn how to back up your files and devices.
- Be aware of suspicious links or email attachments. They may contain malware.
- Practice secure online browsing behaviour. Learn how to secure your online activity.
Never miss a threat
Sign up to receive the latest cyber security alerts, along with information on emerging threats and how to stay secure online.