--- title: "Cyber Threats and How Systems Defend" description: "How attackers use deception and exposed passwords, and how account safeguards, router settings and lost-device tools address different threats." 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: 2026-11-12 --- > **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 How attackers use deception and exposed passwords, and how account safeguards, router settings and lost-device tools address different threats. 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 a defence that addresses it, and identify the defence's limits - Explain how social engineering uses trust or urgency to obtain information or access - Explain how length and unpredictability resist password guessing, and how reuse spreads a password leak ## Lesson: Match each attack to its defence You have followed a browser's requests and responses. A page can also pretend to be a genuine sign-in page. Social engineering uses trust, fear or urgency to persuade a person to reveal information or grant access. Phishing uses deceptive messages or pages. Do not send anyone your password, reset code or sign-in code. Check a worrying message by opening the service's official app or website yourself. *(drawing: Use a route you choose independently. Do not send the message's sender a password or code.)* **Example.** Suppose an unauthorised device joined your home Wi-Fi using an exposed password. Ask the network owner to change it through the router's official settings and reconnect trusted devices. Follow the router's instructions to disconnect unauthorised devices. Laptop antivirus checks that laptop for malicious software; it does not manage router access. Device blocking and guest networks are other router controls, with different uses. A screen lock helps protect a stolen phone. If its lost-device service was enabled, use the official service from a trusted device to request a lock or erase. A command may wait for a connection, and features vary. Erasing may remove data you have not backed up. Protect the linked account and ask the mobile provider to suspend service. Do not approach a suspected thief. *(drawing: A request does not prove the phone has locked. Delivery depends on the device, service and connection.)* Choose a long, unpredictable password that differs for each account. A password manager can generate and store random passwords. A passphrase made from randomly selected words can also resist guessing; familiar sayings and personal details are predictable. Reuse creates another risk: attackers can try a leaked password at other services. Someone who learns a Wi-Fi password can try it against an email account using that same password. The account controlling remote phone protection needs protection too. Use a unique password and two-factor authentication where available. Two-factor authentication adds a different kind of proof, such as a code from an authenticator app. It reduces risk from a stolen password, but a fake page can steal a code too. A weak or reused password still puts the linked account at risk. Remote lock is not a guarantee. **Recap.** Check messages independently, use unique unpredictable passwords, and match each safeguard to its threat. Remote protection has limits. *The lesson, questions, worked solutions and flashcards about security threats and defence limits were written for this dataset.* ## 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) ## Optional connections - [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)