Understanding Blocker Tags in Shopping Bags

Play an AI-generated podcast conversation about this lesson

What is a characteristic of blocker tags according to the text?

They use collision-avoidance algorithms effectively.
They can be embedded in various items like shopping bags. (correct)
They respond to every possible bit-string.
They are known for their long communication distances.

What is a challenge posed by blocker tags deployed with denial-of-service approach?

Solving overlaps in address spaces of different users' blocker tags.
Interference with other applications of RFIDs. (correct)
Effective mapping of customers' tags to subsets for activation.
Increasing the communication distance of blocker tags.

How do Pseudonyms using MetaIDs (Hash-Locks) work based on the text?

They store the original ID directly onto the tag for security reasons.
They communicate using hash functions to compute values. (correct)
They modify the original ID permanently to protect privacy.
They respond with arbitrary key k without any hashing involved.

Which privacy protection measure recommends erasing unique serial numbers at the point of sale?

Disabling tags at the point of sale (C) Signup and view all the answers

What is a significant concern related to inexpensive read-only RFID tags according to the text?

Absence of authentication for both tags and readers (A) Signup and view all the answers

What is a challenge associated with the 'Kill' instruction in EPCglobal/Auto-ID Specification as mentioned in the text?

Potential enumeration of passwords to access the 'Kill' instruction (B) Signup and view all the answers

What is the main purpose of the 'Blocker' tag discussed in the text?

To simulate all possible RFID tag serial numbers (A) Signup and view all the answers

How does the 'Tree-walking' protocol described in the text work?

It asks all tags to reveal their next bit, leading to confusion with the 'Blocker' tag. (B) Signup and view all the answers

How does the 'Blocker' tag system contribute to consumer privacy and commercial security?

By selectively blocking certain ranges of RFID-tag serial numbers in privacy zones. (B) Signup and view all the answers

What is one advantage of using 'privacy zones' with the 'Blocker' tag system?

Enabling movement of items into privacy zones upon purchase for protection. (D) Signup and view all the answers

What is the main function of a capacitance diode in a transponder according to the text?

Generating the 2nd harmonic for re-transmission (D) Signup and view all the answers

How does the microchip in the transponder contribute to reducing interference as per the text?

By dividing the frequency by two before transmission (B) Signup and view all the answers

What is a key characteristic of the security elements mentioned in the text?

They reverse magnetization periodically (D) Signup and view all the answers

What is the purpose of load modulation in RFID technology?

To change the current in the primary coil of the reader (B) Signup and view all the answers

Which technique is commonly used to encode data from the reader to the transponder in RFID technology?

Amplitude Shift Keying (ASK) (D) Signup and view all the answers

How does changing the current in the tag's secondary coil affect data transmission back to the reader in RFID systems?

It modulates load to change current in the reader's primary coil (D) Signup and view all the answers

How does the resonant LC-circuit interact with the alternating field in the vicinity according to the text?

It induces energy from the field via its coils (A) Signup and view all the answers

What is the purpose of altering tags in the microwave range EAS systems as mentioned in the text?

To prevent activation of the anti-theft system (D) Signup and view all the answers

Why are capacitance diodes highlighted as suitable nonlinear energy stores according to the text?

As they aid in frequency multiplication for harmonics (D) Signup and view all the answers

What is the function of intentional short-circuit points, or dimples, in capacitors within transponders based on the text?

To facilitate frequency multiplication (C) Signup and view all the answers