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Alice and Bob wish to communicate using RSA cryptography. Alice selects the two prime numbers p = 1 3 q = 7 and publicises n
Alice and Bob wish to communicate using RSA cryptography.
Alice selects the two prime numbers and publicises She also
calculates Euler's phi, and selects an additional integer
i What condition must satisfy?
Alice selects and publicises this.
She also calculates the multiplicative inverse of mod
ii Calculate
iii Hence justify that, for mod
iv Write in binary form.
Bob's message is
v Show that the message he makes public is modn
vi In your own words, clearly explain how Alice decodes Bob's message to recover
Note, you do not need to calculate the result numerically, but you must
explain the calculations which Alice would need to do
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