def decrypt(text, cipher):
maes = MiniAES()
bin = BinaryStrings()
plain = ascii_to_bin(text)
cipher = bin_to_ascii(cipher)
cipher = ascii_to_bin(cipher)
table = {}
for x in range(_sage_const_0, _sage_const_16):
for y in range(_sage_const_0, _sage_const_16):
for z in range(_sage_const_0, _sage_const_16):
for q in range(_sage_const_0, _sage_const_16):
key = [x, y, z, q]
key = maes.integer_to_binary(key)
encryption = maes(plain, key, algorithm="encrypt")
table[bin_to_ascii(encryption)] = key
# print("First Half Done !!!!!!!!!!!!!!")
for x in range(_sage_const_0, _sage_const_16):
for y in range(_sage_const_0, _sage_const_16):
for z in range(_sage_const_0, _sage_const_16):
for q in range(_sage_const_0, _sage_const_16):
key = [x, y, z, q]
key = maes.integer_to_binary(key)
decryption = bin_to_ascii(
maes(cipher, key, algorithm="decrypt"))
if decryption in table.keys():
k1 = table[decryption]
k2 = key
print("matched key1 in binary: " +
str(table[decryption]))
print("matched key2 in binary: " + str(key))
print("key1 in ASCII: " +
bin_to_ascii(table[decryption]))
print("key2 in ASCII: " + bin_to_ascii(key))
return (k1, k2)
def verify(text, cipher, k1, k2):
maes = MiniAES()
bin = BinaryStrings()
plain = ascii_to_bin(text)
cipher = bin_to_ascii(cipher)
cipher = ascii_to_bin(cipher)
k1 = maes.integer_to_binary(k1)
k2 = maes.integer_to_binary(k2)
encryption = bin_to_ascii(maes(plain, k1, algorithm="encrypt"))
decryption = bin_to_ascii(maes(cipher, k2, algorithm="decrypt"))
if encryption == decryption:
return true
def n2text(listOfNumb):
result = ''
for i in listOfNumb:
if i == 1:
return result
b = str(bin(i)[2:])
b = '0' * (8 - len(b)) + b
result += bin_to_ascii(b)
return result
def get_flag():
# Recover message
_, u, v = xgcd(e1, e2)
m = pow(ct1, u, modulus) * pow(ct2, v, modulus)
# Get binary representation and pad
bin = Integer(m).binary()
while (len(bin) % 8 != 0):
bin = '0' + bin
# Return ASCII string
print(bin_to_ascii(bin))
def i2s(list_of_blocks,block_size):
S = ''
for i in list_of_blocks:
s = "{0:b}".format(int(i))
S += '0'*(block_size-len(s)) + s
return bin_to_ascii(S)