CSE 651 Homework 3 Due: Friday, April 23by class time (10:30 am) Midterm Exam 1: Monday, April 26 Scope: up to RC4 inclusively Open books/notes Calculators allowed 1.Do Problem 6.4 of Stallings. (Interpret part b as follows: After encrypting the entire message, you find an error in the first block of the message. You correct the error and re-encrypt P1. How many other blocks do you need to re-encrypt? (You don’t need to answer the second question of part b, “What is the effect at the receiver?”) 2.Do Problem 6.8 on the 5thedition (6.5 on the 4th) of Stallings. If a bit transmission error occurs in a ciphertext character in 8-bit CFB mode, how far does the error propagate (i.e., how many plaintext characters are likely to be recovered incorrectly)?
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This note was uploaded on 01/22/2011 for the course CSE 651 taught by Professor Tenh.lai during the Spring '10 term at Ohio State.