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(a) (i) If m = p·q·r where p, q, and r are prime numbers, what is Φ(m)?
(ii) Therefore, Determine Φ(440).
(b) Describe the following terms as used in cryptography:
(i) Avalanche effect (ii) Stream cipher (iii) Primitive root (iv) Confusion (v) Steganography ((c)
Suppose an elliptic curve encryption/decryption scheme. The cryptosystem parameters are E5(1,6) and G=(2,4). B's secret key is nB=2.
(i) Find B's public key PB.
(ii) A wishes to encrypt the message Pm=(0,2) and selects the random value k=2. Determine the ciphertext Cm.
QUESTION: (a) Explain, with the aid of a diagram, a Star topology of a network of your choice. (b) Illustrate on the use of a MAN and give an example of one. (c) Describe
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STAR TOPOLOGY In this topology, all devices are attached to a central point, which is sometimes known as the "Hub" as given in the diagram below. Figure: An ideal
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Question : Wi-Fi protected access (WPA) was specified by the Wi-Fi alliance with the primary aim of enhancing the security of existing 802.11 networks. However, WPA was only a
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Feasibility Studies Before deciding on strategy, all information of economic or non economic consequences of vulnerability of information asset should be explored. A number of w
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