Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Directed -Threshold Multi-Signature Scheme   In this paper, we propose a Directed Threshold Multi-Signature Scheme. In
this threshold signature scheme, any malicious set of signers cannot
impersonate any other set of signers to forge the signatures. In case of
forgery, it is possible to trace the signing set. This threshold signature
scheme is applicable when the message is sensitive to the signature receiver;
and the signatures are generated by the cooperation of a number of people from
a given group of senders.

28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph