Encryption of radio frequency identification tags

摘要

A method for encrypting and decrypting user data stored on identification tags, such as RFID tags, of the type having a tag identification code unique to each tag. An encryption/decryption key unique to each tag is based in part or in whole on the tag identification code of each tag, and the unique key is used to encrypt data for storage on the corresponding tag and to decrypt encrypted user data stored on the tag.