title: Number and letter replacement are mixed up with custom substitution cipher in Python
body: <p>This part of the code transfers the letters to numbers and then multiply it by the key (datetime*ip (replaced(.,5)</p>
  
  <pre><code>import datetime
  import time 
  import socket
  while (True):
  IP=int(socket.gethostbyname(socket.gethostname()).replace(".","5"))
  time=(int(datetime.datetime.now().strftime("%Y%m%d%H%M%S")))
  qw=(int(str((time)+(IP))))
  a=int("934")*1
  b=int("346")*1
  c=int("926")*1
  d=int("9522")*1
  e=int("7334")*1
  f=int("5853")*1
  g=int("2432")*1
  h=int("2027")*1
  i=int("7024")*1
  j=int("828")*1
  k=int("798")*1
  m=int("593")*1
  n=int("662")*1
  l=int("5950")*1
  o=int("357")*1
  p=int("506")*1
  q=int("239")*1
  r=int("99")*1
  s=int("372")*1
  t=int("636")*1
  u=int("553")*1
  v=int("255")*1
  w=int("298")*1
  x=int("8822")*1
  y=int("458")*1
  z=int("659")*1
  space=("633")
  msg=input("")
  msg=msg.replace("a",(str(a)))
  msg=msg.replace("b",(str(b)))
  msg=msg.replace("c",(str(c)))
  msg=msg.replace("d",(str(d)))
  msg=msg.replace("e",(str(e)))
  msg=msg.replace("f",(str(f)))
  msg=msg.replace("g",(str(g)))
  msg=msg.replace("h",(str(h)))
  msg=msg.replace("i",(str(i)))
  msg=msg.replace("j",(str(j)))
  msg=msg.replace("k",(str(k)))
  msg=msg.replace("m",(str(m)))
  msg=msg.replace("n",(str(n)))
  msg=msg.replace("l",(str(l)))
  msg=msg.replace("o",(str(o)))
  msg=msg.replace("p",(str(p)))
  msg=msg.replace("q",(str(q)))
  msg=msg.replace("r",(str(r)))
  msg=msg.replace("s",(str(s)))
  msg=msg.replace("t",(str(t)))
  msg=msg.replace("u",(str(u)))
  msg=msg.replace("v",(str(v)))
  msg=msg.replace("w",(str(w)))
  msg=msg.replace("x",(str(x)))
  msg=msg.replace("y",(str(y)))
  msg=msg.replace("z",(str(z)))
  msg=msg.replace(" ",(str(space)))
  msg=int(msg)
  msg=int(msg)*(qw)
  fileb=open("key.txt","w")
  filec=fileb.write(str(qw))
  fileb.close()
  file=open("msg decrypt.txt","w")
  filea=file.write(str(msg))
  file.close()
  print (msg)
  </code></pre>
  
  <p>decryption code this is where the problem is when replacing the number back to letters</p>
  
  <pre><code>file=open("msg decrypt.txt","r")
  encrypted_msg=int(file.read())
  print(encrypted_msg)
  file.close()
  fileb=open("key.txt","r")
  key=int(fileb.read())
  fileb.close()
  encrypted_msg=(int(encrypted_msg)-(key))
  encrypted_msg=(int(encrypted_msg)/(key))
  encrypted_msg=(int(encrypted_msg)+1)
  print(encrypted_msg)
  a=("934")
  b=("346")
  c=("926")
  d=("9522")
  e=("7334")
  f=("5853")
  g=("2432")
  h=("2027")
  i=("7024")
  j=("828")
  k=("798")
  m=("593")
  n=("662")
  l=("5950")
  o=("357")
  p=("506")
  q=("239")
  r=("99")
  s=("372")
  t=("63")
  u=("55")
  v=("255")
  w=("298")
  x=("8822")
  y=("458")
  z=("659")
  space=("633")
  ab=str(encrypted_msg)
  if (a) in ab:
      ab=ab.replace(str(a),"a")
  if ("346") in ab:    
      ab=ab.replace(str(b),"b")    
  if ("926") in ab:    
      ab=ab.replace(str(c),"c")
  if ("9522") in ab:
      ab=ab.replace(str(d),"d")
  if ("7334") in ab:
      ab=ab.replace(str(e),"e")
  if ("5853") in ab:
      ab=ab.replace(str(f),"f")
  if ("2432") in ab:    
      ab=ab.replace(str(g),"g")
  if ("2027") in ab:
      ab=ab.replace(str(h),"h")
  if ("7024") in ab:
      ab=ab.replace(str(i),"i")
  if ("828") in ab:
      ab=ab.replace(str(j),"j")
  if ("798") in ab:
      ab=ab.replace(str(k),"k")
  if ("593") in ab:
      ab=ab.replace(str(m),"m")
  if ("662") in ab:
      ab=ab.replace(str(n),"n")
  if ("5950") in ab:
      ab=ab.replace(str(l),"l")
  if ("357") in ab:
      ab=ab.replace(str(o),"o")
  if ("506") in ab:
      ab=ab.replace(str(p),"p")
  if ("239") in ab:
      ab=ab.replace(str(q),"q")
  if ("99") in ab:
      ab=ab.replace(str(r),"r")
  if ("372") in ab:
      ab=ab.replace(str(s),"s")
  if ("636") in ab:
      ab=ab.replace(str(t),"t")
  if ("553") in ab:    
      ab=ab.replace(str(u),"u")
  if ("255") in ab:
      ab=ab.replace(str(v),"v")
  if ("298") in ab:
      ab=ab.replace(str(w),"w")
  if ("8822") in ab:
      ab=ab.replace(str(x),"x")
  if ("458")in ab:
      ab=ab.replace(str(y),"y")
  if ("659") in ab:
      ab=ab.replace(str(z),"z")
  if ("633") in ab:
      ab=ab.replace(str(space)," ")          
  print(ab)
  </code></pre>
  
  <p>The program encrypts just fine. However, it only decrypts 4 letters anything more it comes out as jumbled letters and numbers.</p>