fix crypto csaw detail

CTFs_and_WarGames/2014-CSAW-CTF/cryptography/crypto-200/psifer-school.py

@@ -26,24 +26,28 @@ def solve1(msg):
 
 
 def solve2(msg):
+  msg="I'lcslraooh o rga tehhywvf.retFtelh mao ae  af ostloh lusr bTsfnr, epawlltddaheoo  aneviedr ose rtyyng etn aini ft oooey hgbifecmoswuut!oa eeg   ar rr h.u t. hylcg io we ph ftooriysneirdriIa utyco gfl oostif sp u"+'""'+"flcnb  roh tprn.o h"
   # Shift cypher, but dealing with special characters
   for j in range(2, len(msg)):
+
     dec_msg = ['0'] * len(msg)
-    idec_msg,shift = 0, 0
+    idec_msg, shift = 0, 0
+
     for i in range(len(msg)):
       dec_msg[idec_msg] = msg[i]
       idec_msg += j
-      if idec_msg >= len(msg):
+
+      if idec_msg >  len(msg) - 1:
         shift += 1
         idec_msg = shift
     dec_msg = "".join(dec_msg)
+
     if "you" not in dec_msg: continue
     return dec_msg
 
 
 
 
-
 def solve3(msg):
   # Vigenere Cypher
   key =  VigCrack(msg).crack_codeword()
@@ -57,6 +61,7 @@ def solve3(msg):
 
 if __name__ == '__main__':
 
+  """
   PORT = 12345
   HOST = '54.209.5.48'
   tn = Telnet(HOST ,PORT)
@@ -112,3 +117,6 @@ if __name__ == '__main__':
   print
   print 'Answer stage 3: ' + answer3
   print '(key: ' + key + ')'
+
+  """ 
+  print solve2(msg='a')

CTFs_and_WarGames/2014-CSAW-CTF/cryptography/crypto-200/psifer-school.py~

@@ -0,0 +1,119 @@
+#!/usr/bin/env python
+
+
+__author__ = "bt3gl"
+
+
+import sys
+from telnetlib import Telnet
+from caesarCipher import decipher, decipher_simple
+from pygenere import VigCrack
+
+
+
+def solve1(msg):
+  # Caesar Cipher
+  # Solve the first cypher and encode back to unicode:
+  # the method encode() returns an encoded version of the string
+  # Both method work fine.
+  # One is by freq. analysis or the other by rotating
+  dec_msg = decipher(msg)
+  #dec_msg = decipher_simple(msg)
+  dec_msg = dec_msg.split()[-1]
+  return dec_msg
+
+
+
+
+def solve2(msg):
+  msg="I'lcslraooh o rga tehhywvf.retFtelh mao ae  af ostloh lusr bTsfnr, epawlltddaheoo  aneviedr ose rtyyng etn aini ft oooey hgbifecmoswuut!oa eeg   ar rr h.u t. hylcg io we ph ftooriysneirdriIa utyco gfl oostif sp u"+'""'+"flcnb  roh tprn.o h"
+  # Shift cypher, but dealing with special characters
+  for j in range(2, len(msg)):
+    dec_msg = ['0'] * len(msg)
+    idec_msg = 0
+    shift = 0
+    for i in range(len(msg)):
+      dec_msg[idec_msg] = msg[i]
+      idec_msg += j
+      if idec_msg >= len(msg):
+        shift += 1
+        idec_msg = shift
+    dec_msg = "".join(dec_msg)
+    if "I hope you don't have a problem with this challenge." not in dec_msg: continue
+    return dec_msg
+
+
+
+
+def solve3(msg):
+  # Vigenere Cypher
+  key =  VigCrack(msg).crack_codeword()
+  dec_msg = VigCrack(msg).crack_message()
+  dec_msg =  dec_msg.replace(" ", "")
+  return key, dec_msg
+
+
+
+
+
+if __name__ == '__main__':
+
+  """
+  PORT = 12345
+  HOST = '54.209.5.48'
+  tn = Telnet(HOST ,PORT)
+
+
+  '''
+    SOLVING STAGE 1 - CEASAR CIPHER
+  '''
+
+  tn.read_until(b'psifer text: ')
+  msg_in1 = tn.read_until(b'\n').dec_msg().strip()
+
+  answer1 = solve1(msg_in1)
+
+  tn.write(answer1.encode() + b'\n')
+
+  print 'Message stage 1: ' + msg_in1
+  print
+  print 'Answer stage 1: ' + answer1
+  print
+  print
+
+
+
+  '''
+    SOLVING STAGE 2 - SPECIAL CHARS
+  '''
+  msg_in2 = tn.read_all().dec_msg()
+  msg_in2 = (msg_in2.split(':')[1]).split("Time")[0]
+
+  answer2 = solve2(msg_in2)
+
+  tn.write(answer2.encode() + b'\n')
+
+  print 'Message stage 2: ' + msg_in2
+  print
+  print 'Answer stage 2: ' + answer2
+  print
+  print
+
+
+  '''
+    SOLVING STAGE 3 - VINEGERE
+  '''
+  msg_in3 = tn.read_all().dec_msg()
+  msg_in3 = (msg_in3.split(':')[1]).split("Time")[0]
+
+
+  key, answer3 = solve3(msg_in3)
+  tn.write(answer3.encode() + b'\n')
+
+  print 'Message stage 3: ' + msg_in3
+  print
+  print 'Answer stage 3: ' + answer3
+  print '(key: ' + key + ')'
+
+  """ 
+  print solve2(msg='a')