TSA master keys are a set of seven specialized keys (often referred to as 001 through 007) used by Transportation Security Administration officers to open "TSA-approved" luggage locks. These locks feature a red diamond logo and are designed so that travelers can secure their bags while allowing security agents to perform manual inspections without damaging the suitcase. The existence of these keys became a major security controversy in 2015 when a set of high-resolution photos of the keys was accidentally published, allowing hobbyists to 3D-print their own working versions. By 2026, most "TSA-approved" locks still utilize these same legacy mechanical standards, though some high-end luggage brands have begun implementing electronic "smart" locks that utilize temporary digital tokens for security. For the average traveler, using a TSA lock is still recommended because it prevents the "bolt-cutter" approach to inspections, but it is important to remember that these locks are designed for compliance, not high-level theft prevention, as the "master keys" are now effectively public knowledge.