Write in python

 

Problem #1 Given below is a well-known cryptosystem called affine Caesar cipher, as well as some ciphertext generated using the affine Caesar cipher. P=C=Z26={0, 1, 2, ..., 25}; K= {(a, b) = Z26 x Z26 | gcd(a, 26)=1} y=E([a,b], x)=(ax + b) mod 26, x= D([a,b], y) = a(y - b) mod 26, where x = P, y = C. Ciphertext sample: VPWOMFUWOFMYMHUNWBBWGCRVVPSFVPUTHUJWMC OMFUOVSVWOVWGSRSFSREOWOQMHKOBMHVPWOUFG HETVWMFOEOVUYVMMZCVGSFEMCCOUEMCHKFMQRU NIUMBRWFUSHSRIUZHSVMBWFNVPUOUGHUVKUEVM MVPUFEMCQWRRPSJUVHCREGHSGKUNVPUOEOVUY For this problem, please do the following: (a) provide an analysis detailing its strength/weakness; (b) attempt to uncover the plaintext associated with the ciphertext; (c) attempt to determine the secret key (a, b) used.