An eavesdropper is someone who secretly listens to other people's private conversations or personal information without their permission. Full definition
Since the SSID can be so easily intercepted by eavesdroppers, I would never recommend disabling its broadcast in place of encryption. (pcworld.com)
Although this epiphany is a public revelation in our telling of the story, the words come intimately to the praying Jesus, not to an audience of eavesdroppers. (religion-online.org)
It promised the ultimate in security, but quantum cryptography is under attack — from cunning eavesdroppers who have worked out how to fool the system (newscientist.com)