Interchangeable cores (IC) are modular lock cylinders engineered to be extracted and replaced in seconds using a specialized Control Key without disassembling the surrounding lockset or door hardware. They are the standard for commercial office buildings, universities, hospital networks, and financial institutions.
Mechanical combination safe locks protect commercial safes, bank vaults, and government security containers. Unlike key-operated cylinders where pins move linearly, mechanical safe locks utilize a rotating wheel pack and fence mechanism that operates entirely through angular rotational tolerances.
Radio Frequency Identification (RFID) and contactless smartcard mechanisms govern the transmission of identity credentials over air interfaces. Understanding modulation schemes, framing architectures, and cryptographic handshakes is essential for assessing electronic access control security.