BrainyBellyLaughs on Instagram: "The video in the post illustrates a basic security flaw in keypad door locks: a cloth wipe reveals greasy fingerprint smudges on frequently pressed digits, allowing PIN reconstruction without advanced tools. Posted by @cemburuya , a tech video curator, on January 1, 2026, it amassed 41,000+ views and 200+ replies in two days, with Indonesian commenters noting the "dangerous" ease of the hack. This demo underscores physical security risks backed by cybersecurity r