Ci= E(Pi) = Pi + 2 Ciphertext: dwwdfn n a 0.080 h 0.060 0.070 t 0.090 b 0.015 i 0.065 0 0.080 - 0.030 c 0.030 0.005 p 0.020 v 0.010 d 0.040 k 0.005 a 0.002 w 0.015 e 0.130 0.035 r 0.065 x 0.005 f 0.020 m 0.030 S 0.060 y 0.020 g 0.015 z 0.002 Table 1 - 1-gram (Unigram) Model of English () () () 0.0375 0 7 0.0175 14 21 () 0.0395 0.0503 0.0325 1 8 0.0342 15 22 0.0583 2 0.0400 0.0275 0.0625 9 0.0575 16 23 0.0168 3 10 0.0483 17 0.0325 24 0.0267 4 11 18 25 5 0.0525 12 0.0408 19 0.0250 6 0.0127 13 0.0257 20 0.0325 Table 2 - Correlation of frequency of letters in ciphertext with frequency of corresponding letters in English Ci= E(Pi) = Pi + 2 Ciphertext: dwwdfn n a 0.080 h 0.060 0.070 t 0.090 b 0.015 i 0.065 0 0.080 - 0.030 c 0.030 0.005 p 0.020 v 0.010 d 0.040 k 0.005 a 0.002 w 0.015 e 0.130 0.035 r 0.065 x 0.005 f 0.020 m 0.030 S 0.060 y 0.020 g 0.015 z 0.002 Table 1 - 1-gram (Unigram) Model of English () () () 0.0375 0 7 0.0175 14 21 () 0.0395 0.0503 0.0325 1 8 0.0342 15 22 0.0583 2 0.0400 0.0275 0.0625 9 0.0575 16 23 0.0168 3 10 0.0483 17 0.0325 24 0.0267 4 11 18 25 5 0.0525 12 0.0408 19 0.0250 6 0.0127 13 0.0257 20 0.0325 Table 2 - Correlation of frequency of letters in ciphertext with frequency of corresponding letters in English