Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: RHyTHM: A Randomized Hybrid Scheme To Hide in the Mobile Crowd   Any on-demand pseudonym acquisition strategy is problematic should the
connectivity to the credential management infrastructure be intermittent. If a
vehicle runs out of pseudonyms with no connectivity to refill its pseudonym
pool, one solution is the on-the-fly generation of pseudonyms, e.g., leveraging
anonymous authentication. However, such a vehicle would stand out in the crowd:
one can simply distinguish pseudonyms, thus signed messages, based on the
pseudonym issuer signature, link them and track the vehicle. To address this
challenge, we propose a randomized hybrid scheme, RHyTHM, to enable vehicles to
remain operational when disconnected without compromising privacy: vehicles
with valid pseudonyms help others to enhance their privacy by randomly joining
them in using on-the-fly self-certified pseudonyms along with aligned
lifetimes. This way, the privacy of disconnected users is enhanced with a
reasonable computational overhead.

13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th