problem 2 I need a clear solution to this problem

Stuck with a difficult assignment? No time to get your paper done? Feeling confused? If you’re looking for reliable and timely help for assignments, you’ve come to the right place. We promise 100% original, plagiarism-free papers custom-written for you. Yes, we write every assignment from scratch and it’s solely custom-made for you.


Order a Similar Paper Order a Different Paper

problem 2 I need a clear solution to this problem

problem 2 I need a clear solution to this problem
CS466, University of Massachusetts, Amherst, Spring 2019Instructor: Adam O’Neill people.cs.umass.edu/ ~adamo/sp19466 Instructions Before attempting this homework, be sure to review the cours e’s Academic Honesty policy on the course syllabus , and be certain to abide by it and the homework policies discu ssed in class. This homework is due on Friday, February 8that11:59pm , by which time you should have submitted your solutions as a PDF to Gradescope. Since we aren’t using real paper here, please use at least one page per solution (in this case at least four pages: at least one each for Problem 1, Problem 2A, Problem 2B, and Problem 2C). Please al solabel your solution pages correctly on Gradescope ! If you do not, you will bededucted up to 10 points , so make sure you leave yourself about ve minutes to upload, especially i f you are unfamiliar with the process. Problem 1.(30 points.) In a recent interview with astrophysicist Neil Degrasse Tyson,1 Edward Snowden suggested a reason why humans have not observed alie n communication is that aliens’ use of “good” encryption would make such communication look ran dom and therefore indistinguishable from cosmic background radiation. (NB: He is talking about a liens communicating amongst them- selves, not attempts to contact humans.) Critique this argu ment from a cryptographic standpoint. Problem 2. (70 points.) Let Z 10 = {0,1 , . . . , 9}. Consider the symmetric-key encryption scheme SE = ( K,E ,D ) with message-space ( Z 10 )4 (that is, messages are four decimal digits) de ned as follows. Key-generation algorithm Koutputs a uniformly random Perm (Z 10 ), where Perm(Z 10 ) is the set of permutations on Z 10 , and encryption algorithm Eis de ned by Algorithm E ( M ): Parse MasM[1]M [2]M [3]M [4] where each M[i ] Z 10 For i= 1 to 4 do: P [i ] M[i ] + imod 10 C [i ] (P [i ]) Return C[1] C[2] C[3] C[4] (Part A -10 points.) Finish the description of SE. That is, specify a decryption algorithm Dsuch that SE= ( K,E ,D ) is a correct symmetric-key encryption scheme with K,E as de ned above. (Part B – 30 points.) Is SEa substitution cipher? Why or why not? (Part C – 30 points.) Is SEa Shannon-secure? Why or why not? 1 See http://www.startalkradio.net/show/a- conversation- with- edward- snowden- part- 1/ . 1

Writerbay.net

We’ve proficient writers who can handle both short and long papers, be they academic or non-academic papers, on topics ranging from soup to nuts (both literally and as the saying goes, if you know what we mean). We know how much you care about your grades and academic success. That's why we ensure the highest quality for your assignment. We're ready to help you even in the most critical situation. We're the perfect solution for all your writing needs.

Get a 15% discount on your order using the following coupon code SAVE15


Order a Similar Paper Order a Different Paper