/

Play fair cipher 5 x 5 .

:RANOM

DBYHC

KI / JGFE

TSQPL

ZXWVU

Keyword Monarchy :1- .

2- .3- J , I . :

1- x balloon bolxloxon .

2- ar RM .3- mu BP ea IM JM . .

676 = 26 x 26 .

Hill Cipher ( m ) m , m m = 3 :1- ( a = 0 , b = 1 ,. Z = 25 )

2- C1 = ( k11 p1 + k12 p2 + k13 p3 ) mod 26C2 = ( K21 P1 + K22 P2 + K23 P3 ) mod 26

C3 = ( K31 P1 + K32 P2 + K33 P3 ) mod 26

P1 K11 K12 K13 C1P2 K21 K22 K23 = C2P3 K31 K32 K33 C3 C = KPC

P

K 3x 3 : Pay more money

K

17 17 5 21 18 21 = K

2 2 19 ( 15 0 24 ) = P

K P ( 375 819 986 ) = C C = ( 11 13 18 ) = LNS

LNSHDLEWMTRW 1-K ( K )

P = K-1 C

:

1- .

2- . ( ) Vigenese Chiphes 26 ( 25 ) A 3 D . :

X y x y V .

= 0 )

we are discovered save yourself deceptive

Key = deceptivedeceptivedeceptivePlaintext = we are discovered save yourselfCiphextext = ZICVTWQNGRZGVTWAVZHCQYGLMGJ . ( . Transposition Techniques ( Soft Of Permutation ) ( Transposition Tech ) .. (The Rail fence tech ) (Diagonals ) .Meet me after the toga party (rail fence of depths ) :

M e m a c r h t g p r y

E t e f e t e o a a t

MEMATRHTGPRTETEFETEOAAT :4 3 1 2 5 6 7A T T A K P

O S T P O N E

D U N T I L T

W O A M X Y Z

TTNAAPTMTSUOAODW

COIXKLPETZ

4 3 1 2 5 6 7

T T N A A P T

M T S U O A O

D W C O I X K

N L Y P E T Z

NSCYAVOPTTWLTMDNAOIEPAXTTOKZ

.

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

:

17 09 05 27 24 16 12 07 10 02 22 20 03 25 15 13 04 23 19 14 11 01 26 21 18 08 06 28

.

Rotor Machines

(DES) .

26 26 (monoaphabetic substitution ) . A (3) . 26 26 . . ( A ) . .