RSA blocker tag
Encyclopedia
An RSA blocker tag is a RFID tag that responds positively to all unauthorized requests, thus blocking some scanners
Scanners
Scanners is a 1981 science-fiction horror film written and directed by David Cronenberg and starring Jennifer O'Neill, Stephen Lack, Michael Ironside, and Patrick McGoohan...

 from reading any RFID tags placed nearby. The tags are designed to protect privacy, and are supposedly unable to be used for theft, denials of service, and other malicious uses.

Other mechanisms designed to protect privacy for RFID item tagging for retail use are the EPCglobal
EPCglobal
EPCglobal is a joint venture between GS1 and GS1 US .It is an organization set up to achieve worldwide adoption and standardization of Electronic Product Code technology....

 kill command and the Clipped Tag
Clipped Tag
The Clipped Tag is a radio frequency identification tag designed to enhance consumer privacy. Radio frequency identification or RFID is an identification technology in which information stored in semiconductor chips contained in RFID tags is communicated by means of radio waves to RFID readers. The...

 proposed by IBM
IBM
International Business Machines Corporation or IBM is an American multinational technology and consulting corporation headquartered in Armonk, New York, United States. IBM manufactures and sells computer hardware and software, and it offers infrastructure, hosting and consulting services in areas...

.

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