How do you find the permutation key if you know the ciphertext and the plaintext? Ciphertext: WSTOHAFABHCRERODAREHBHIABHERHOAEETLTITELPDEIAFHMATAFEPNESEWNGOMSYAYLRNAEITMDOATOWMWRINAIENPENNDWIEALSDAAEN

How do you find the permutation key if you know the ciphertext and the plaintext?

Ciphertext:

WSTOHAFABHCRERODAREHBHIABHERHOAEETLTITELPDEIAFHMATAFEPNESEWNGOMSYAYLRNAEITMDOATOWMWRINAIENPENNDWIEALSDAAENOEIOCESEEIBELAFOTMDTSLDRSYESSDSEBTWRHRAOIENDDNATPFDETINHLEETNNRTTSNMHREFTCUSYITOHEFHTLPLWEIPGRAUELPFOYEDTLAMTRIULARNNNHETNECEEIHRPREBUHMLRRTTORIEEMIOEALTMOSETNEHETEWSVTMGSEYCHETCRHDGOIIRHDDEHACGTACDLOKTEDLHMIRRE

Plaintext:

SLOWLY DESPARATLY SLOWLY THE REMAINS OF PASSAGE DEBRIS THAT ENCUMBERED THE LOWER PART OF THE DOORWAY WAS REMOVED WITH TREMBLING HANDS I MADE A TINY BREACH IN THE UPPER LEFT HAND CORNER AND THEN WIDENING THE HOLE A LITTLE I INSERTED THE CANDLE AND PEERED IN THE HOT AIR ESCAPING FROM THE CHAMBER CAUSED THE FLAME TO FLICKER BUT PRESENTLY DETAILS OF THE ROOM WITHIN EMERGED FROM THE MIST