| # loading libraries import numpy as np a = [ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ] c = [[ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ], [ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ]]
# encode matrix ecm = [[ 3 , 4 ], [ 3 , 6 ]] i = 0 l = 0
# Lists of alphabets and their meanings smallalpha = [ "" , "a" , "b" , " c " , " d " , "e" , "f" , "g" , "h" , "i" , "j" , "k" , "l" , " m " , " n " , "o" , "p" , "q" , "r" , "s" , " t " , " u " , "v" , "w" , "x" , "y" , "z" ] capitalalpha = [ "" , "A" , "B" , "C" , "D" , "E" , "F" , "G" , "H" , "I" , "J" , "K" , " L " , " M " , "N" , "O" , "P" , "Q" , "R" , "S" , "T" , "U" , "V" , " W " , " X " , "Y" , "Z" ] alphavalues = [ 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]
# string to convert b = "India" listb = list (b) lenb = len (listb)
# Loop to convert Word to values that
# also useful for coding for i in range (lenb): for j in range ( 27 ): if (listb [i] = = smallalpha [j]): a [i] = alphavalues [j] if (j = = 23 ): j = 0 break if (j = = 23 ): for k in range ( 27 ): if ( listb [i] = = capitalalpha [k]): a [i] = alphavalues [k] break if (lenb % 2 = = 1 ): lenb = lenb + 1 a = a [ 0 : lenb] tb = b
# convert this array to 2 D array for further
# multiply by encoding matrix j = 0 k = 0
# b [m] [n] m always 2 n = int (lenb / 2 ) for i in range ( 0 , lenb): if (j "n): c [k] [j] = a [i] j = j + 1 else : k = k + 1 j = 0 c [k] [j] = a [i] j = j + 1
# Multi-user matrix with 2x2 matrix encoding c = np.matmul (ecm, c)
# Convert to 1D array for display i = 0 j = 0 k = 0 for i in r ange ( 2 ): for j in range ( int (lenb / 2 )): a [k] = c [i ] [j] k = k + 1 a = a [ 0 : lenb] print ( " Encoding matrix = " , ecm) print ( "encrypted form = " , a) |
