On Tuesday, the US Federal Bureau of Investigation advised Americans to share a secret word or phrase with their family members to protect against AI-powered voice-cloning scams, as criminals increasingly use voice synthesis to impersonate loved ones in crisis.

"Create a secret word or phrase with your family to verify their identity," wrote the FBI in an official public service announcement (I-120324-PSA).

For example, you could tell your parents, children, or spouse to ask for a word or phrase to verify your identity if something seems suspicious, such as "The sparrow flies at midnight," "Greg is the king of burritos," or simply "flibbertigibbet." (As fun as these sound, your password should be secret and not the same as these.)

The bureau also recommends that people listen carefully to the tone and word choices in unexpected calls claiming to be from family members. The FBI reports that criminals use AI-generated audio to create convincing voice clips of relatives pleading for emergency financial help or ransom payments. //

Of course, passwords have been used since ancient times to verify someone's identity, and it seems likely some science fiction story has dealt with the issue of passwords and robot clones in the past. It's interesting that, in this new age of high-tech AI identity fraud, this ancient invention—a special word or phrase known to few—can still prove so useful.