Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Flexible and Secure Remote Systems Authentication Scheme Using Smart
  Cards   The paper presents an authentication scheme for remote systems using smart
card. The scheme prevents the scenario of many logged in users with the same
login identity, and does not require password/verifier table to validate the
users' login request. The scheme provides a user-friendly password change
option, and withstands the replay, impersonation, stolen-verifier, guessing,
and denial-of-service attacks.

35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph