1. Show how you can use frequency table to decipher the following ciphertext which is based on the Caesar cipher without knowing the key:

Irkpmwl pmxivexyvi mw xli wxyhc sj pmxivexyvi avmxxir mr xli Irkpmwl perkyeki Xli avmxivw hs rsx rigiwwevmpc lezi xs fi jvsq Irkperh fyx ger fi jvsq epp sziv xli asvph. Mx mrgpyhiw wsqi sj lmwxsvc'w qswx jeqsyw avmxivw Irkpmwl pmxivexyvi hexiw fego qsvi xler jmzi girxyvmiw Mx vitviwirxw avmxivw rsx srpc jvsq hmjjivirx tevxw sj xli asvph erh xmqi tivmshw, fyx mx gszivw izivc qensv kirvi erh wxcpi sj avmxmrk ew aipp

2. Find the plaintext from the cipher. The Caesar cipher is created after shifting the plaintext by key of 4.

Cipher: WIRHLIPT