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Digital SignaturesDigital Signatures are encrypted messages which can be proven mathematically to be authentic. These are created in response to rising requirement to verify information transferred by using electronic systems. Asymmetric encryption techniques are used to generate digital signatures
COLLISION DETECTION The signals from two devices will interfere with each other and the overlapping of frames is known a collision. It does not cause to the hardware but data
Packet Filtering Firewall Packet filtering is a network security mechanism that works by controlling what data can flow in and out of the network. The basic device that interco
Categories of Controls Controlling risk through mitigation, avoidance or transference is accomplished by implementing controls. There are 4 effective approaches to select the co
Types of IDSs and Detection Methods IDSs operate as network based, host based, or application based systems and focused on protecting network information assets. All the IDSs us
FRAGMENTATION Fragmentation information is kept in different extension header. Every fragment has base header and fragmentation header. Whole datagram including original hea
Network-Based IDS (NIDS) A NIDS resides on computer or appliance connected to segment of an organization’s network and looks for signs of attacks. While examining packets, a NID
BUS TOPOLOGY In a bus topology all devices are attached to a single long cable and any device can send data to any other device. For this function, coordination is needed to d
Question: (a) State the strong law of large numbers. (b) Data have been collected on response times (in minutes) at a fire station. The data are 2:7 1:8 0:8 1:4 1:2 (i
Question : (a) What do you meant by the term "Bastion Host"? What is its use? (b) "Hostile" Java applets will do undesirable actions. Mention two problems caused by Hosti
Question: (a) Distinguish between Steganograhy and Cryptography. (b) "Playfair cipher is more secure than Monoalphabetic cipher." Justify this statement. (c) Various ap
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