Securing your computer, web browser, and email inbox is the foundational first line of defense in cybersecurity. In Hindi, hum ise kehte hain "Apne computer aur data ka digital tala aur chabi lagana". In today's interconnected digital world, an unprotected PC can easily be infected with malwares, have private photos and passwords stolen, or be hijacked into a botnet.

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1. Securing Your Personal Computer (PC)

To secure a Windows or Linux computer from external and internal threats:

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   Keep Operating System Updated: Always enable automatic Windows Updates. Operating system updates contain essential "Security Patches" (suraksha sudhar) that fix vulnerabilities discovered by hackers.
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   Built-in Antivirus & Firewall:

• Windows Defender (Microsoft Defender): Windows includes a built-in, highly effective antivirus that provides real-time protection against viruses, trojans, and spyware.
• Windows Firewall: Acts as a security guard (suraksha prahari) that monitors incoming and outgoing network traffic. It blocks unauthorized hackers on the internet from connecting directly to your computer ports.

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   User Account Control (UAC) & Standard User Accounts:

• Never run daily tasks using the Administrator account. Use a standard user account so accidental malware downloads cannot silently install system-wide software without prompt.

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   Regular Data Backup (3-2-1 Rule):

• Keep 3 copies of important data on 2 different media (e.g., internal hard drive + external pen drive/SSD), with 1 copy stored off-site or in cloud storage (Google Drive / OneDrive).

2. Securing Web Browsers (Chrome, Edge, Firefox)

Your web browser is your gateway to the internet, making it a prime target for attackers:

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3. Securing Email Communications

Email is the most common channel used by cybercriminals to deliver malware and launch phishing attacks:

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   Never Open Suspicious Attachments: Malicious attachments often masquerade with fake double extensions like Invoice.pdf.exe or infected macro-enabled spreadsheets (.xlsm). If an unknown sender sends an attachment, do not download or open it.
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   Two-Factor Authentication (2FA) on Email:

• Your email account (Gmail / Outlook) holds password reset links for all your other accounts (bank, social media, Digilocker).
• Enabling 2FA (Two-Step Verification) ensures that even if someone steals your password, they cannot log in without the OTP or biometric prompt sent to your mobile phone.

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   Beware of Spoofed Email Addresses: Hackers often mimic official company names (e.g., support@sbl-bank.com instead of sbi.co.in). Always inspect the full sender address carefully before trusting the email.
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   Spam & Junk Filter: Regularly mark spam emails as Spam so your email provider's artificial intelligence learns to filter them automatically.

Summary Checklist for Daily Security

• Keep Windows Defender Real-Time Protection and Firewall turned ON.
• Use Incognito Mode (Ctrl + Shift + N) when surfing on cyber cafe or college lab computers.
• Never download pirated cracked software or torrent files, as they almost always contain embedded trojans.
• Turn ON Two-Step Verification (2FA) on your Google / Gmail account immediately.

Multiple Choice Questions

1. Which built-in Windows utility acts as a barrier to block unauthorized incoming and outgoing internet traffic?

A. Windows Media Player B. Windows Firewall C. Disk Defragmenter D. Task Scheduler Answer: B Explanation: Windows Firewall monitors and filters network traffic entering and leaving your computer, blocking malicious unauthorized access.

2. In LibreOffice or web browsers like Google Chrome, which shortcut opens a Private / Incognito browsing window?

A. Ctrl + Shift + N B. Ctrl + Alt + Delete C. Ctrl + F4 D. Alt + Tab Answer: A Explanation: In Google Chrome and Microsoft Edge, Ctrl + Shift + N opens a new Incognito window where browsing history and cookies are not saved.

3. What does the 's' stand for in 'https://' seen in browser address bars?

A. Simple B. Secure C. System D. Software Answer: B Explanation: HTTPS stands for HyperText Transfer Protocol Secure. The data transferred between browser and server is encrypted using SSL/TLS.

4. What is the primary purpose of Two-Factor Authentication (2FA)?

A. To increase internet downloading speed B. To provide an extra layer of security beyond just a password using an OTP or physical device C. To allow two users to share the same email address D. To compress email attachments automatically Answer: B Explanation: Two-Factor Authentication requires two separate pieces of evidence (e.g., password + phone OTP) before granting access, preventing unauthorized logins even if the password is leaked.

5. Why should a user avoid opening email attachments with extensions like '.exe' or '.scr' from unknown senders?

A. They take up too much RAM B. They are executable files that can silently install dangerous viruses or trojans on your PC C. They automatically delete your monitor drivers D. They convert your operating system to Linux Answer: B Explanation: Files ending in .exe, .scr, or .bat are executable program files that run code directly on your operating system, making them a common vehicle for malware.