--- title: "Cyber Threats and How Systems Defend" description: "The usual ways systems are attacked, from tricking a person into handing over a password to feeding a program input it trusted too far, and the defence that answers each one." canonical: https://lightmysky.com/learn/computing/cyber-threats-and-how-systems-defend-mt_zMJzhIdEWd source: https://lightmysky.com/learn/computing/cyber-threats-and-how-systems-defend-mt_zMJzhIdEWd.md retrieved: 2026-09-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Cyber Threats and How Systems Defend The usual ways systems are attacked, from tricking a person into handing over a password to feeding a program input it trusted too far, and the defence that answers each one. Subject: Computing · Area: Computer Systems · Ages 15 to 16 Page: https://lightmysky.com/learn/computing/cyber-threats-and-how-systems-defend-mt_zMJzhIdEWd ## Ready when they can - Match a threat to the defence that actually addresses it - Explain why people are attacked more often than the code is - Say what makes a password hard to guess, and why reusing one is the bigger risk ## Lesson: Match each attack to its defence Breaking strong code is hard, but tricking a person is often easy. That trick has a name: social engineering. An attacker pretends to be family, a friend, or the company itself, then asks you to hand over a password or a reset code. Your habit beats their script: never share a password or code with anyone, even when they sound urgent. A person who is truly locked out should use the official recovery process, not your code. **Example.** A stranger is quietly using your Wi-Fi through a weak password that was shared too widely. Antivirus software will not remove them, because the weak spot is the password itself. Change the Wi-Fi password to something long and random, then join only the devices you trust. Make it unique: reusing a password means one leak can unlock everything you own. A stolen phone is a threat no code can stop: someone walks off with your logged-in accounts. The matching defence is remote lock and erase through the account signed in on the phone. From another device you can lock it, show a message, or wipe it clean. This shield holds only while that account password stays strong, since a thief who guesses it can simply switch the protection off. **Tip.** Make each password long, random, and unique. Skip birthdays and plain words, and never reuse a password from another account. A password manager lets you keep a different strong password everywhere while remembering only one master password. Add two-factor authentication, a second check such as a code on your phone, so a stolen password alone still fails. **Recap.** Match each threat to its own defence, guard the person as well as the code, and keep every password long and unique. ## Practice 8 questions on this page, each with its working shown. ## Needs first - [How a Web Page Reaches Your Screen](https://lightmysky.com/learn/computing/how-a-web-page-reaches-your-screen-mt_8JveAW2Mg7) - [Passwords, Logins and Keeping an Account Yours](https://lightmysky.com/learn/computing/passwords-logins-and-keeping-an-account-yours-mt_ohI6ct6tO4) - [Searching and Evaluating Online](https://lightmysky.com/learn/computing/searching-and-evaluating-online-mt_S-XboPwA8k) ## Opens up - [Symmetric Encryption and What a Cipher Promises](https://lightmysky.com/learn/computing/symmetric-encryption-and-what-a-cipher-promises-mt_egJQEiFWZA) - [The Impacts of Computing: Law, Ethics and the Environment](https://lightmysky.com/learn/computing/the-impacts-of-computing-law-ethics-and-the-environment-mt_veX-psjipc) - [Threat Modelling: Assets, Adversaries and Trust Boundaries](https://lightmysky.com/learn/computing/threat-modelling-assets-adversaries-and-trust-boundaries-mt_VRXTkrNFvx)