Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nori: Concealing the Concealed Identifier in 5G   IMSI catchers have been a long standing and serious privacy problem in pre-5G
mobile networks. To tackle this, 3GPP introduced the Subscription Concealed
Identifier (SUCI) and other countermeasures in 5G. In this paper, we analyze
the new SUCI mechanism and discover that it provides very poor anonymity when
used with the variable length Network Specific Identifiers (NSI), which are
part of the 5G standard. When applied to real-world name length data, we see
that SUCI only provides 1-anonymity, meaning that individual subscribers can
easily be identified and tracked. We strongly recommend 3GPP and GSMA to
standardize and recommend the use of a padding mechanism for SUCI before
variable length identifiers get more commonly used. We further show that the
padding schemes, commonly used for network traffic, are not optimal for padding
of identifiers based on real names. We propose a new improved padding scheme
that achieves much less message expansion for a given $k$-anonymity.

16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org