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Cybersecurity

Technical resources about Cybersecurity.

Identify a Device by IP Address on Linux Safely

An IP address is a starting clue, not a complete device identity. Correlate Linux routing and neighbour data with DNS, DHCP or cloud inventory, then use the smallest authorized Nmap probe that answers the remaining question.

How to Delete or Deactivate a Quora Account

Deactivation is a reversible pause that leaves your Quora content online; deletion starts a 14-day grace period and then permanently removes most account content. Use this guide to preserve needed data, choose correctly, avoid accidental reactivation, and verify the result.

Netflix VPN and Region Errors Explained

A VPN no longer guarantees access to another Netflix catalog, and Netflix may limit a VPN connection to globally licensed titles. This guide explains the network behavior, safe diagnosis, travel and relocation rules, and why old provider-specific instructions should not be trusted.

Create an Android Upload Key for Google Play

For a Play App Signing release, your upload key proves that a bundle came from your team; Google’s app-signing key signs the APKs users install. Generate them as separate identities, protect the private material, and register the correct certificate fingerprints.

Prevent Screenshots in Android with FLAG_SECURE

`FLAG_SECURE` asks Android to keep a window out of screenshots and non-secure displays. Apply it before sensitive UI appears, understand its window-wide scope, and treat newer detection and screen-share APIs as complementary—not interchangeable—controls.

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