Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CompChall: Addressing Password Guessing Attacks   Even though passwords are the most convenient means of authentication, they
bring along themselves the threat of dictionary attacks. Dictionary attacks may
be of two kinds: online and offline. While offline dictionary attacks are
possible only if the adversary is able to collect data for a successful
protocol execution by eavesdropping on the communication channel and can be
successfully countered using public key cryptography, online dictionary attacks
can be performed by anyone and there is no satisfactory solution to counter
them. This paper presents a new authentication protocol which is called
CompChall (computational challenge). The proposed protocol uses only one way
hash functions as the building blocks and attempts to eliminate online
dictionary attacks by implementing a challenge-response system. This
challenge-response system is designed in a fashion that it does not pose any
difficulty to a genuine user but is time consuming and computationally
intensive for an adversary trying to launch a large number of login requests
per unit time as in the case of an online dictionary attack. The protocol is
stateless and thus less vulnerable to DoS (Denial of Service) attacks.

26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics