Problems on Ceaser Cipher, Playfair Ciphers and Polyaphabetic Ciphers

Caesar cipher C = (P+3) mod 26 Here K (=3 Let PT = a b cd = (0+3) mod 26 3 = d = (1+3) mud 26 = 4 moa 26 = e = (2+3) mod 26 = 5 mod 26 = f = (3+3) mod 26 = 6 mod 26 = g CT = PEFG Eg PT = way? CT = ZABC Playfair cipher 5x5 matrix Key MONARCHY M 0 N A R rules 1. Paring by 2 letters. C H Y B D- substitution by filled alphabet, Say x R f G I/5 K ag: balloon L P Q S T = ba Ix 10 on U 2 W X x 2. 2 by letter to right PT in same row replace Eg: AR PT ag: CH PT CT RM HY CT 2 PT in same col, replace by letter beneath. 3 ag: MC PT ag : MU - P.J CE CT CM - CT

Polyalphabetic ciphers vigenere aphes PT a b C de fghiji k a a b b b c key c c d d a e e e f f f g g g h h n Z. a Take word : (key) app (Key) PT: get bag Intersection of A and b is taken as cipher text so, b or no .ou a 0 b then add them. so, 0+1 i so, b : then I 15+0 = 15 / so NP 15+ 6 21 Sov = 15+6 = 2+ BPV - CT Vernam cipher Ci= Pi + Ki Transposition rail fence technique ag. PT Meet me MeM etle CT MEMETE /