Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robust ambiguity for contact tracing   A known drawback of `decentralised' contact tracing architectures is that
users who have been in contact with an infected person are able to precisely
identify the relevant contact, and thereby perhaps identify the infected
person. In their proposal, the PACT team discuss a simple DH-based protocol to
mitigate this problem, but dismiss it because it is vulnerable to a malicious
user who may deviate from the specified behaviour. This note presents a
modified protocol which achieves robustness against a fully malicious user, and
establishes some simple security properties.

34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th