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CEIS 210 Week 1 Assignment 1 NEW
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1.1 Consider an automated teller machine (ATM) in which users provide a personal identification number (PIN) and a card for account access. Give examples of confidentiality, integrity, and availability requirements associated with the system and, in each case, indicate the degree of importance of the requirement.
1.2 Repeat Problem 1.1 for a telephone switching system that routes calls through a switching network based on the telephone number requested by the caller.
3.19 Using the Vigenère cipher, encrypt the word “explanation” using the key leg.
3.20 This problem explores the use of a one-time pad version of the Vigenère cipher.
In this scheme, the key is a stream of random numbers between 0 and 26. For example, if the key is 3 19 5 . . . , then the first letter of plaintext is encrypted with a shift of 3 letters, the second with a shift of 19 letters, the third with a shift of 5 letters, and so on.
a. Encrypt the plaintext sendmoremoney with the key stream
9 0 1 7 23 15 21 14 11 11 2 8 9
b. Using the ciphertext produced in part (a), find a key so that the cipher text decrypts to the plaintext cashnotneeded.
