Expt2client.py

import socket
import math
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
port = 9999

s.connect((host, port))



listofprimes=[0]*26
smalllistofprimes=[0]*26
smalllistofnos=[0]*10
listofalphabets=[None]*62

for i in range(26):
    listofalphabets[i] = chr(65+i)
j=0
for i in range(26,52,1):
    listofalphabets[i] = chr(97+j)
    j=j+1
j=0
for i in range(52,62,1):
    listofalphabets[i] = chr(48+j)
    j=j+1

z=0
j=1
count = 23
i=6
listofprimes[0]=102
listofprimes[1]=103
listofprimes[2]=105
while(count!=0):
    flag = 0
    for j in range(1, int(math.sqrt(i))+1, 1):
        if i%j ==0:
            flag = flag+1
    if flag ==1:
        if int(len(str(i)))==2 or int(len(str(i)))==1 :
            x = i+100
        else:
            x=i
        listofprimes[z+3]=x
        z=z+1
        count = count-1
    i=i+1
listofprimes.reverse()

countdown=26
i=0
while(countdown!=0):
    smalllistofprimes[i]=listofprimes[i]+100
    countdown = countdown-1
    i= i+1
for i in range(10):
    smalllistofnos[i]=chr(65+i)+chr(65+i)+chr(65+i)

keys=listofprimes+smalllistofprimes+smalllistofnos

sbox=dict(zip(listofalphabets, keys))
print(sbox)
#Sbox created.

PT=[]
RevPT=[]
CT=[]
PT=input("Enter the Plaintext here:")
RevPT=PT[::-1]

for i in RevPT:
    for j in sbox.keys():
        if i==j:
            CT.append(str(sbox[j]))
print("The Cipher Text is:")
print(CT)
#Encryption Completed
list_str="|".join(CT)
s.send(list_str.encode('ascii'))

s.close()