Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BSSSQS: A Blockchain Based Smart and Secured Scheme for Question Sharing
  in the Smart Education System   Existing education systems are facing a threat of question paper leaking
(QPL) in the exam which jeopardizes the quality of education. Therefore, it is
high time to think about a more secure and flexible question sharing system
which can prevent QPL issue in the future education system. Blockchain enables
a way of creating and storing transactions, contracts or anything that requires
protection against tampering, accessing etc. This paper presents a new scheme
for smart education, by utilizing the concept of blockchain, for question
sharing. A two-phase encryption technique for encrypting question paper (QSP)
is proposed. In the first phase, QSPs are encrypted using timestamp and in the
second phase, previous encrypted QSPs are encrypted again using a timestamp,
salt hash and hashes from previous QSPs. These encrypted QSPs are stored in the
blockchain along with a smart contract which helps the user to unlock the
selected QSP. An algorithm is also proposed for selecting a QSP for the exam
which picks a QSP randomly. Moreover, a timestamp based lock is imposed on the
scheme so that no one can decrypt the QSP before the allowed time. Finally,
security is analyzed by proving different propositions and the superiority of
the proposed scheme over existing schemes is proven through a comparative study
based on the different features.

17
The categories of this paper are: q-fin
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex