What is a random set of characters designed to increase the length of the item being hashed quizlet?

RFID tags have multiple security concerns. First and foremost, because they are connected via RF energy, physical security is a challenge. Security is an important issue for RFID tag systems because they form a means of identification and there is a need for authentication and confidentiality of the data transfers.

Two main attacks are replay and eavesdropping. In a replay attack, the RFID information is recorded and then replayed later. In the case of eavesdropping, the data can be collected, monitoring the movement of tags for whatever purpose needed by an unauthorized party.

There are several standards associated with securing the RFID data flow, including ISO/IEC 18000 and ISO/IEC 29167 for cryptography methods to support confidentiality, untraceability, tag and reader authentication, and over-the-air privacy, while ISO/IEC 20248 specifies a digital signature data structure for use in RFID systems.