The company doesn't know how many impostors are on its Web site, says spokesman Barry Schnitt.

FORBES: Social Media

Although impostors have existed for ages, the growing frequency and cost of identity theft is worrisome.

ECONOMIST: Identity theft

Mr. Jerome contends that only he knows the tell-tale sign distinguishing the real McCoy from the impostors who occasionally turn up.

WSJ: A Midnight Dreary for Those Who Seek Tell-Tale Signs of Poe's Elusive 'Toaster'

If it was, then the company would be instantly entitled to protection from imitation by local traders, and the impostors would have to pack up shop.

ECONOMIST: Johannesburgers and fries

Moy says NSS will carefully screen customers to sell only to known companies and agencies, and will use encryption keys to make sure it's not selling to impostors.

FORBES: Technology

In recent years, obvious impostors have also shown up.

WSJ: A Midnight Dreary for Those Who Seek Tell-Tale Signs of Poe's Elusive 'Toaster'