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ITC595-Information Security 1

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Questions:

1.Automated Teller Machines (ATM) are designed so that users will provide a personal identification number (PIN) and a card to access their bank accounts. Give examples of confidentiality, integrity and availability requirements associated in such a system and describe the degree of importance for each requirement.
 
2.A thief broke into an Automated Teller Machine (ATM) using a screwdriver and was able to jam the card reader as well as breaking five keys from the keypad. The thief had to halt the process of breakin and hide, as a customer approached to use the ATM. The customer was able to successfully enter their ATM card, punch in the 4 digit PIN and was able to draw out some cash. Since the card reader was jammed, the customer was however not able to withdraw the ATM card, and drove off to seek some help. In the meantime, the thief came back and decided to try to discover the customer’s PIN so that he can steal money from the customer. You are required to calculate the maximum number of PINs that the thief may have to enter before correctly discovering the customer’s PIN?
 
3.Thinking about bio-metric authentication, list three reasons why people may be reluctant to use biometrics. Describe various ways of how to counter those objections.
 
4.In bio-metric authentication, false positive and false negative rates can be tuned according to the requirement, and they are often complementary i.e. raising one lowers the other. Describe two circumstances where false negatives are significantly more serious than false positives.
 
5.Transposition is one known method of encrypting the text. What can be one way that a piece of cipher text can be determined quickly if it was likely a result of a transposition? Utilising some of the decryption techniques (substitution and others) covered in the subject so far, you are required to decipher (find the plain text) the cipher text that will be provided to you closer to the assessment due date via the subject site. In order to present your solution, you need to demonstrate and explain the steps taken to decipher this text.
 
6. CIPHER George owns a company that produces mobile phones to end users. George’s company must keep up with other competitors therefore during a company meeting George announced that he will be making changes to their new upcoming mobile device. George’s company follows a strict confidentiality policy when it comes to the exchange of information. To prevent the leakage of information during transmission George also informed his employees during the meeting that he will be sending them instructions encrypted under Caesar cipher followed by another substitution where the key is 234. Employees received the following cipher text.
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