GrayKey, an iPhone unlocker, is secretly being marketed to law enforcement agencies. It is theorized that Cellebrite, an Israeli company, knows of one or more iOS vulnerabilities that allow them to access the devices. While the technology is a good thing for law enforcement, it presents some significant security risks. It can take up to three days or longer for six-digit passcodes, and the time needed for longer passphrases is not mentioned. At this price, the device requires no limit to the number of unlocks and has no limit on how long it works.”]