Only two individuals are known to have grayboxes, partners Kasumi Goto and the late Keiji Okuda. Keiji was killed by Donovan Hock for his heavily-encrypted graybox. Hock has been trying to crack it since he obtained it for the information that Keiji recorded in it. Kasumi was planning to take it back, and after seeking out Cerberus, which had been attempting to contact her, saw an opportunity to get it back.