Designed as an alternative to basic keys, Latchkey Cards were created in the year 2000, and completely replaced all key-locks in Nero in the year of 2009. They are completely white as to not trace back to Nero, and use microscopic code to unlock doors, terminals, and other locked objects.
Issued in 2002, the idea for the latchkey card was nearly turned down due to a lack of funding. However, several European countries believed their money would be well spent on this new invention. These countries included such countries as Germany, Norway, Sweden, and England. Within a year, they had been mass-produced and given to every agent, scientist, and worker in Nero.
Latchkey cards are used most commonly for security-lock door in containment facilities, though some have been set to be used on entity cells (such as the case of ABN-092) and computer terminals. Nowadays, some special-munitions cases require latchkey cards to open.
Latchkey scanners (the "lock" to the latchkey card) are not easily hacked; though several scientists looking to further the latchkey's uses have shown that the scanners can be hacked using basic knowledge of computers, and that a computer-proficient entity may be able to unlock them without access to a card.