Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Asymptotically Optimal RFID Authentication Protocol Against Relay
  Attacks   Relay attacks are a major concern for RFID systems: during an authentication
process an adversary transparently relays messages between a verifier and a
remote legitimate prover.
  We present an authentication protocol suited for RFID systems. Our solution
is the first that prevents relay attacks without degrading the authentication
security level: it minimizes the probability that the verifier accepts a fake
proof of identity, whether or not a relay attack occurs.

12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an