CA Based RFID Authentication Protocol for Privacy and Anonymity

Okubo et al. proposed a hash-chain based authentication protocol which protects users' location privacy and anonymity with strong forward security. However, Li et al. claimed that the hash-chain calculation must be a burden on low-cost RFID tags and gives back-end servers heavy calculation loads since the numbers for hash computation are required in a hash chaining technique. Thus, the non-group cellular automata chaining technique is adopted composed only of logical bitwise operations, in order to maintain both security guarantees and a low-cost construction.