Ejemplo n.º 1
0
  def fun1 (self):

    msgs = "MDAwMDAwTm93IHRoYXQgdGhlIHBhcnR5IGlzIGp1bXBpbmc=\n\
MDAwMDAxV2l0aCB0aGUgYmFzcyBraWNrZWQgaW4gYW5kIHRoZSBWZWdhJ3MgYXJlIHB1bXBpbic=\n\
MDAwMDAyUXVpY2sgdG8gdGhlIHBvaW50LCB0byB0aGUgcG9pbnQsIG5vIGZha2luZw==\n\
MDAwMDAzQ29va2luZyBNQydzIGxpa2UgYSBwb3VuZCBvZiBiYWNvbg==\n\
MDAwMDA0QnVybmluZyAnZW0sIGlmIHlvdSBhaW4ndCBxdWljayBhbmQgbmltYmxl\n\
MDAwMDA1SSBnbyBjcmF6eSB3aGVuIEkgaGVhciBhIGN5bWJhbA==\n\
MDAwMDA2QW5kIGEgaGlnaCBoYXQgd2l0aCBhIHNvdXBlZCB1cCB0ZW1wbw==\n\
MDAwMDA3SSdtIG9uIGEgcm9sbCwgaXQncyB0aW1lIHRvIGdvIHNvbG8=\n\
MDAwMDA4b2xsaW4nIGluIG15IGZpdmUgcG9pbnQgb2g=\n\
MDAwMDA5aXRoIG15IHJhZy10b3AgZG93biBzbyBteSBoYWlyIGNhbiBibG93"

    return (self.iv,c10.cbcencrypt(base64.b64decode(random.choice(msgs.split("\n"))),self.iv,self.key))
Ejemplo n.º 2
0
def encryption_oracle(s):
    import c10
    import random
    from Crypto.Cipher import AES

    key = open("/dev/urandom").read(16)

    prefix = open("/dev/urandom").read(random.randint(5, 10))
    suffix = open("/dev/urandom").read(random.randint(5, 10))

    s = str(prefix) + str(s) + str(suffix)
    if random.randint(0, 1) == 1:
        return c10.cbcencrypt(s, open("/dev/urandom").read(16), key)
    else:
        return AES.new(key, AES.MODE_ECB).encrypt(c10.pkcs7pad(s))
Ejemplo n.º 3
0
print "############### normal exchange"
##### normal exchange

Alice = c33.dh(random.randint(0,10000),p,g)

# A->B            Send "p", "g", "A"
Bob = c33.dh(random.randint(0,10000),p,g)
Bob_secret = Bob.shsecret(Alice.A)

# B->A            Send "B"
Alice_secret = Alice.shsecret(Bob.A)

# on Alice
Alice_msg = "Alice says Hi"
Alice_iv = open("/dev/urandom").read(16)
Alice_enc = c10.cbcencrypt(Alice_msg,Alice_iv,c28.sha1(str(Alice_secret)).digest()[:16])
print "msg Alice send: "+Alice_msg

# A->B            Send AES-CBC(SHA1(s)[0:16], iv=random(16), msg) + iv

# on Bob
print "msg Bob received: "+c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(Bob_secret)).digest()[:16])
Bob_msg = "Bob says Hi"
Bob_iv = open("/dev/urandom").read(16)
Bob_enc = c10.cbcencrypt(Bob_msg,Bob_iv,c28.sha1(str(Bob_secret)).digest()[:16])
print "msg Bob send: "+Bob_msg
# B->A            Send AES-CBC(SHA1(s)[0:16], iv=random(16), A's msg) + iv

# on Alice
print "msg Alice received: "+c10.cbcdecrypt(Bob_enc,Bob_iv,c28.sha1(str(Alice_secret)).digest()[:16])
Ejemplo n.º 4
0
# A->M            Send "p", "g", "A"
# Mallory changes A to p # A^a mod p = p^a mod p = 0
# M->B            Send "p", "g", "p"
Bob = c33.dh(random.randint(0,10000),p,g)
Bob_secret = Bob.shsecret(Alice.A)
# B->M            Send "B"
# Mallory changes B to p # B^a mod p = p^a mod p = 0
# M->A            Send "p"
Alice_secret = Alice.shsecret(Bob.A)
print "shared key="+binascii.b2a_hex(c28.sha1(str(Alice_secret)).digest()[:16])
print "attack key="+binascii.b2a_hex(c28.sha1(str(1)).digest()[:16])
Alice_msg = "Alice hello OneA"
Alice_iv=''
for i in range(16):
    Alice_iv = Alice_iv+chr(random.randint(0,255))
Alice_enc = c10.cbcencrypt(Alice_msg,Alice_iv,c28.sha1(str(Alice_secret)).digest()[:16])
print "Alice发送: "+str(Alice_msg)

# A->M            Send AES-CBC(SHA1(s)[0:16], iv=random(16), msg) + iv
# the secret is 0
print "攻击者解密出: "+c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(1)).digest()[:16])
# M->B            Relay that to B

print "Bob收到: "+c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(Bob_secret)).digest()[:16])
Bob_msg = "Bob HELLO OneA"
Bob_iv=''
for i in range(16):
    Bob_iv = Bob_iv+chr(random.randint(0,255))
Bob_enc = c10.cbcencrypt(Bob_msg,Bob_iv,c28.sha1(str(Bob_secret)).digest()[:16])
print "Bob发送: "+Bob_msg
Ejemplo n.º 5
0
def exchange(p,g,Mallory=False,mg=0):

  # A->B            Send "p", "g"
  # B->A            Send ACK

  # with Mallory, M would send NACK to Alice suggesting new p and g values
  # and would send the same weak values to Bob, assuming there is no
  # check on weak values, the communications would be screwed

  if Mallory:
    g = mg

  Alice = c33.dh(random.randint(0,10000),p,g)

  # A->B            Send "p", "g", "A"
  Bob = c33.dh(random.randint(0,10000),p,g)
  Bob_secret = Bob.shsecret(Alice.A)

  # B->A            Send "B"
  Alice_secret = Alice.shsecret(Bob.A)

  # on Alice
  Alice_msg = "Alice says Hi"
  Alice_iv = open("/dev/urandom").read(16)
  Alice_enc = c10.cbcencrypt(Alice_msg,Alice_iv,c28.sha1(str(Alice_secret)).digest()[:16])
  print "msg Alice send: "+Alice_msg

  # A->B            Send AES-CBC(SHA1(s)[0:16], iv=random(16), msg) + iv
  if Mallory:
    print "Mallory intercepts:",
    if g == 1:
      print c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(1)).digest()[:16])
    elif g == p:
      print c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(0)).digest()[:16])
    elif g == p - 1:
      try:
        msg = c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(1)).digest()[:16])
      except:
        msg = c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(p-1)).digest()[:16])
      print msg
    else:
      print ""

  # on Bob
  print "msg Bob received: "+c10.cbcdecrypt(Alice_enc,Alice_iv,c28.sha1(str(Bob_secret)).digest()[:16])
  Bob_msg = "Bob says Hi"
  Bob_iv = open("/dev/urandom").read(16)
  Bob_enc = c10.cbcencrypt(Bob_msg,Bob_iv,c28.sha1(str(Bob_secret)).digest()[:16])
  print "msg Bob send: "+Bob_msg
  # B->A            Send AES-CBC(SHA1(s)[0:16], iv=random(16), A's msg) + iv

  if Mallory:
    print "Mallory intercepts:",
    if g == 1:
      print c10.cbcdecrypt(Bob_enc,Bob_iv,c28.sha1(str(1)).digest()[:16])
    elif g == p:
      print c10.cbcdecrypt(Bob_enc,Bob_iv,c28.sha1(str(0)).digest()[:16])
    elif g == p - 1:
      try:
        msg = c10.cbcdecrypt(Bob_enc,Bob_iv,c28.sha1(str(1)).digest()[:16])
      except:
        msg = c10.cbcdecrypt(Bob_enc,Bob_iv,c28.sha1(str(p-1)).digest()[:16])
      print msg
    else:
      print ""

  # on Alice
  print "msg Alice received: "+c10.cbcdecrypt(Bob_enc,Bob_iv,c28.sha1(str(Alice_secret)).digest()[:16])