need answers to the questions in the attached documents also need the reasons for the answers.

 

INFA 640 Home work #3Choose the best answer (one) and give reason in a few sentences for your choice or not choosingothers. Please give a reference. You only need to list the page number if you are giving referencefrom the text book e.g. TB p. nn.To get full credit the reason should be in your own words, not acopy from the textbook or any other reference. Without reason in your own words you will notget full credit. The questions 1 thru 8weigh 4 pts each. The eighth Question 9,10,11carries 6 pts.Each. Please name your file as [lastname firstname INFA640_ HW3], use APA format includeself-certification Due last day of the session Sunday 7/17 11:59 PM1The primary difference between today’s cryptographic methods and those of 60years ago is our ________________.a)use of substitution ciphersb)use of symmetric keysc)reliance on computers and complex mathematicsd)reliance on transposition ciphersReason2.Symmetrical ciphers work on __________ of information.a)blocks or continuous streamsb)bits or bytesc)packetsd)sectors or roundsReason3.A drawback of a symmetrical key system is that the___________.a)number of keys can grow very largeb)keys can be discovered easilyc)keys are non-changingd)keys are publicReason4.Block ciphers are weaker than stream ciphers. True/False.Justification

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