https://www.braingle.com/brainteasers/codes/onetimepad.php#form
http://rumkin.com/tools/cipher/otp.php
https://www.boxentriq.com/code-breaking/one-time-pad


solomonkane




s  a  ss ss
o  f  tt tt
l  e  pp pp
o  d  rr rr
m  k  ww ww
o  l  zz zz
n  r  ee ee
k  n  xx xx
a  o  oo oo
n  t  gg gg
e  w  aa aa

afedklrnotw   

stprwzexoga 
stprwzexoga
stprwzexoga

(M + K) - 1

s a       s
o f       t
l e       p
o d       r
m k       w
o l       z
n r       e
k n       x
a o       o
n t       g
e w       a


  1  a
  2  b
  3  c
  4  d
  5  e
  6  f
  7  g
  8  h 
  9  i 
 10  j
 11  k
 12  l
 13  m
 14  n
 15  o
 16  p
 17  q
 18  r
 19  s
 20  t
 21  u
 22  v
 23  w
 24  x
 25  y
 26  z