Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Passwords   A quantum password is a quantum mechanical analogue of the classical
password. Our proposal is completely quantum mechanical in nature, i.e. at no
point is information stored and manipulated classically. We show that, in
contrast to quantum protocols that encode classical information, we are able to
prevent the distribution of reusable passwords even when Alice actively
cooperates with Eve. This allows us to confront and address security issues
that are unavoidable in classical protocols.

24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph