Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An IBE-based Signcryption Scheme for Group Key Management   This paper presents a new crypto scheme whose title promises it to be so
boring that no-one will bother reading past the abstract. Because of this, the
remainder of the paper is left blank.

35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci