Despite being succeeded by more secure technologies, MIFARE Classic remains a cornerstone of global access control and transit ticketing systems. This paper investigates the enduring security vulnerabilities of the MIFARE Classic protocol, specifically focusing on the proprietary CRYPTO1 cipher. We evaluate the efficacy of modern recovery tools, such as the MIFARE Classic Tool (MCT) and specialized hardware like the Proxmark3, in auditing these legacy systems and recovering data from compromised or "locked" tags. 1. Introduction