Cryptography, Encryption, Cybersecurity.
5. This will get: >>> (1*3)%5 3 >>> (2*3)%5 1 >>> (3*3)%5 4 >>> (4*3)%5 2 We ignore the zero for the set in A, as we will always get the same result. Thus we map {1,2,3,4} to {3,1,4,2}. Now we need to divide by three modulo 3. For this, we create the inverse mod of the value, and then just