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Problem 1 : Assuming 1000 4GHz machines can crack 2^40 keys per second. a. How many years would it take to try all possibilities of

Problem 1 :

Assuming 1000 4GHz machines can crack 2^40 keys per second.

a. How many years would it take to try all possibilities of 64 bit encryption?

b. How many years would it take to try all possibilities of 128 bit encryption?

Please show the work!! Thank you

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