Question 1
a) What is the difference between an unconditionally secure cipher and a computationally
secure cipher (10 marks)
b) Define confusion and diffusion within the context of cryptography principles and highlight
differences between them.
(15 marks)
(Total 25 marks)
Question 2
When not even the large number of keys in a monoalphabetic cipher provided sufficient
security, an approach to improving security was to encrypt multiple letters. The Playfair Cipher
is an example.
a) Describe the encryption process for the Playfair Cipher, including the rules for special cases.
(10 marks)
b) Describe the decryption process for the Playfair Cipher.
(10 marks)
c) Discuss and quantify the security of the Playfair Cipher.
(5 marks)
(Total 25 marks)
Question 3
d) Discuss the concept of digital signature, and the basic process of generating a digital
signature.
(10 marks)
e) Present an application of digital signature. In the context of the application, discuss how a
digital signature is applied and verified.
(15 marks)
(Total 25 marks)
Question 4
a) Explain the concept of RBAC, and its main features.
(10 marks)
b) Considering the Blackboard system, analyse how to use RBAC mechanism to restrict users’
resource access control based on their roles in the system (e.g. staffs and students).
Comparing with Access Control List (ACL) mechanism, discuss the advantages of using
RBAC to implement the authorization in such a system.
(15 marks)
Sample Solution
the products and services can be considered as one of the financial institution energy. The bank offers an array of products and services like any other conventional banks in Malaysia. it can be given deposits from public and supply financing to people, firms, cooperative or even government body. financial institution Rakyat non-public loan is one of the popular amongst government servants. bank Rakyat contains comfort manner to pay lower back the loan with the aid of cutting of their month-to-month wages. however the products and services offered by using the financial institution are constrained to the ones allowed by means of the various legal guidelines and regulations inside the u . s . a . especially, the; . Banking and monetary establishments Act 1989 LBAFIA), . Co-operative Act 1993, . financial institution Kerjasama Rakyat Malaysia Berhad (unique Provision) Act 1978, . financial institution Rakyat by means of-regulation. bank Rakyat is grouped underneath the development financial institution class collectively with bank Pembangunan Malaysia (BPM), bank Pertanian Malaysia (BPM) and bank Industri Malaysia (BlM). The product affords excessive returns to the bank because the gathering mechanism guarantees set off payments. the collection is executed thru a 3rd party call Biro Perkhidmatan Angkasa (BPA). The statutory frame became founded to sell co operative movement and to offer the machinery for gathering payments on behalf of the co-operatives at a small percent on the amassed amount. The channel lets in bank Rakyat to secure their mortgage bills with little or no chance of default. The product stands at nearly eighty% of the financial institution’s overall mortgage portfolio. discern 2.1 indicates how the machine of collection thru BPA works. Fig 2.1 series through BPA other financing facilities like agricultural loan, property, business and leasing additionally has been well acquired by means of the public. every other popular product is the Islamic pawn broking called Ar-Rahnu. Pawn dealer-i Ar-Rahnu some other product of bank Rakyat provide , offers fast and clean coins financing as much as RM50,000 with low safekeeping rate prices based totally on three Syariah principle. interest loose loans (Qard) , savings with assure at the pawn items (Wadi`ah Yah Dhamanah) and safekeeping expenses (Ujrah). It gives options to customer from the traditional practices. The modest and small charge has attracted a regular glide of customers specifically at the beginning of school periods. Deposits: financial savings Account, fashionable investment Account bank Rakyat source its deposits mainly from its Al-Wadiah financial savings Account and Al-Mudharabah popular funding Account (fixed deposits). Like every other financial savings account located in conventional banks it offers profits price and use of computerized Teller gadget (ATM). The constant deposits centers has been giving aggressive returns to the depositors and has been a success in attracting massive. http://www.bnm.gov.my/recommendations/01_banking/04_prudential_stds/15_mnm.pdf http://www.bankrakyat.com.my/ar-rahnu- Weaknesses The performance of bank Rakyat in loan processing isn't always efficient and takes a long term. The feasible thing for this difficulty is inner coordination because mortgage record should be checked by using th>
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