def main2():
p = Preprocessing()
keys = "11110111110000001010010111101001101111101000101000000000111111111111000000001111111011011100010101010010101101010101000010111111"
KEYS = p.Convert128_to_32bits(keys)
#plain_text = "00000001110101111011011011111011110000000111010111101101101111100010111110011101001101110010100001011000100000100111011001001110"
plain_text = "00000000000000000000000000000001010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
print(plain_text)
EI_S = p.Convert128_to_32bits(plain_text)
e = Encryption()
d = Decryption()
cypher_txt = e.Encrypt(EI_S, KEYS)
print("\ncypher_txt ", cypher_txt, "\n\n")
e1, e2, e3, e4 = d.Decrypt(cypher_txt, KEYS)
decrypted_txt = e1 + e2 + e3 + e4
print("Decrypted Txt : ", decrypted_txt, "\n\n")
print(decrypted_txt == plain_text)
count = 0
for i in range(128):
if decrypted_txt[i] != plain_text[i]:
print(i + 1)
count += 1
print(count)
def main():
while True:
print "Choose from job"
print "1.Key Generation"
print "2.Encrytion"
print "3.Decryption"
print "4.Exit"
choice = sys.stdin.readline()
if (choice == '1\n'):
myKeyGenerator = keyGenerator()
myKeyGenerator.keyGen()
print "Key Generation Finished\n"
elif (choice == '2\n'):
encryptor = Encryption()
encryptor.encrypt()
print "Encryption Finished\n"
elif (choice == '3\n'):
decryptor = Decryption()
decryptor.decrypt()
print "Decryption Finished\n"
elif (choice == '4\n'):
break;
else:
print "invalid input"
choice = sys.stdin.readline()
def __init__(self, objCommon):
try:
self.common = objCommon
self.encryption = Encryption(objCommon)
self.keyGeneration = KeyGeneration(objCommon)
self.decryption = Decryption(objCommon)
except Exception as ex:
print(
"An error occurred while initializing class BreakEncryption. Error: ",
ex)
def __init__(self):
try:
self.__usrInpt = -1
self.common = Common("KEY.txt", "ENC.txt")
self.keyGeneration = KeyGeneration(self.common)
self.encryption = Encryption(self.common)
self.decryption = Decryption(self.common)
self.breakEncryption = BreakEncryption(self.common)
except Exception as ex:
print("An error occurred while initializing class Main. Error: ",
ex)
def main(self):
responce = input(
"If you want to encrypt a file type Y? If you want to input data to be encrypted type N. If you want to decrypt data type NN. Y/N/NN "
).upper().strip()
while ((responce != "Y") and (responce != "N") and (responce != "NN")):
print("\nResponce must be either Y/N/NN")
responce = input(
"If you want to encrypt a file type Y? If you want to input data to be encrypted type N. If you want to decrypt data type NN. Y/N/NN "
).upper().strip()
if responce == "Y": # encrypt existing file
filePath = self.__fileHandler()
encryption = EncryptFile(filePath)
encryption.encAlg(filePath, encryption.encFile())
responce = self.__responceHandler(
"Do you want to delete the unencrypted file? Y/N (Y is recommended) "
)
if responce == "Y":
os.remove(os.path.join(self.__PATH, filePath))
elif responce == "NN": # decrypt an encrypted file
filePath = self.__fileHandler()
outName = input("Enter name of output file: ")
while os.path.exists(outName):
responce = self.__responceHandler(
f"Are you sure you want to overwrite {outName}? Y/N ")
if responce == "Y":
break
decrypt = Decryption()
decrypt.decrypt(filePath, outName)
responce = self.__responceHandler(
"Do you want to delete the encrypted file Y/N ")
if responce == "Y":
os.remove(filePath)
else: # encrypt user input
data = input("Enter data to be encryped: ")
encData = EncryptInput(data)
encData.encAlg(outName=encData.encData())
os.remove(os.path.join(self.__PATH, "data.txt"))
def __init__(self, encryption_encoded_key, integrity_encoded_key):
iv_length = 16
is_length = 4
byte_length = 16
self.decrypt = Decryption.__init__(self, encryption_encoded_key,
integrity_encoded_key, iv_length,
is_length, byte_length)
def decry(self):
if self.file_name == '':
if self.msg_box.get('1.0', END) != '':
self.msg_box.delete('1.0', END)
self.msg_box.insert(END, 'Please open a bitmap file first.')
return 0
elif self.available < 1:
if self.msg_box.get('1.0', END) != '':
self.msg_box.delete('1.0', END)
self.msg_box.insert(END, 'This image is too short to hide message.')
return 0
else:
decryption = Decryption(self.file_name)
decry_msg = decryption.run()
if self.msg_box.get('1.0', END) != '':
self.msg_box.delete('1.0', END)
self.msg_box.insert(END, 'Hidden message: "' + decry_msg + '".')
class Main:
#Constructor for Main class
def __init__(self):
try:
self.__usrInpt = -1
self.common = Common("KEY.txt", "ENC.txt")
self.keyGeneration = KeyGeneration(self.common)
self.encryption = Encryption(self.common)
self.decryption = Decryption(self.common)
self.breakEncryption = BreakEncryption(self.common)
except Exception as ex:
print("An error occurred while initializing class Main. Error: ",
ex)
#String Representation
def __str__(self):
return "usrInpt: " + str(self.__usrInpt) + ", keyGeneration: " + str(self.keyGeneration) + ", common: " + str(self.common) + \
", encryption: " + str(self.encryption) + ", decryption: " + str(self.decryption) + ", breakEncryption: " + str(self.breakEncryption)
#User interface
def Start(self):
try:
while self.__usrInpt != 0:
print("\nMain Menu:\n",\
"\n1. Generate Keys (Elgamal Algorithm)",\
"\n2. Encrypt Message (Requires Reciever's Public Key)",\
"\n3. Decrypt Message (Requires Receiver's Private Key)",\
"\n4. Break Encryption & Decipher Message (Baby Step Giant Step Algorithm)",\
"\n0. Exit",\
"\nPlease enter a digit corresponding to the step")
userEntered = input("(e.g. 1/2/../0): ")
result = self.common.IsInteger(userEntered)
if result is False:
self.__usrInpt = -1
else:
self.__usrInpt = result
if self.__usrInpt == 1:
self.keyGeneration.GenerateAndStoreKeys()
elif self.__usrInpt == 2:
self.encryption.EncryptMessage()
elif self.__usrInpt == 3:
self.decryption.DecryptMessage()
elif self.__usrInpt == 4:
self.breakEncryption.BreakEncryptionGetMessage()
elif self.__usrInpt == 0:
print("\nExiting...")
else:
print("\nInvalid Input entered! Please retry.")
except Exception as ex:
print(
"An error occurred in function Main.Start while processing. Error: ",
ex)
finally:
print("\nThank you!", \
"\nPython project on Encryption, Decryption and Man-In-The-Middle attack implementation", \
"\nsubmitted by Aayush Garg [email protected]")
def decryption( self, long_ciphertext ):
res = Decryption.run( self, long_ciphertext );
if "error" in res:
return res;
else:
return {
'idfa' : res["plaintext"],
'datetime' : res["datetime"],
};
def decryption(self, long_ciphertext):
res = Decryption.run( self, long_ciphertext );
if "error" in res:
return res;
else:
return {
'hyperlocal': self.decrypt_hyper_local( res["plaintext"] ),
'datetime' : res["datetime"],
};
def decryption(self, long_ciphertext):
res = Decryption.run(self, long_ciphertext)
if "error" in res:
return res
else:
return {
'idfa': res["plaintext"],
'datetime': res["datetime"],
}
def decryption( self, long_ciphertext ):
res = Decryption.run( self, long_ciphertext );
if "error" in res:
return res;
else:
price = unpack(">Q", res["plaintext"]);
return {
'price' : price[0],
'datetime' : res["datetime"],
};
class BreakEncryption:
#Constructor for BreakEncryption class
def __init__(self, objCommon):
try:
self.common = objCommon
self.encryption = Encryption(objCommon)
self.keyGeneration = KeyGeneration(objCommon)
self.decryption = Decryption(objCommon)
except Exception as ex:
print(
"An error occurred while initializing class BreakEncryption. Error: ",
ex)
#String Representation
def __str__(self):
return "No member variables other than member objects to classes"
#4. Break encryption and get original message using Baby Step Giant Step algorithm
def BreakEncryptionGetMessage(self):
try:
print("\nIf your listening to somebody's conversation as a Man In The Middle",\
"and wish to break an encrypted message,")
print(
"you must have the knowledge of encrypted message and the header sent to the Reciever."
)
#Read Encrypted Message and Header from the file
tupleEncMsgHead = self.encryption.ReadEncryptedMessageAndHeader()
if len(tupleEncMsgHead) > 0:
print(
"\nThe public key of the Receiver is required to break an encryption."
)
print(
"The Public Keys are usually publicly available via Key Hosting Services."
)
#Read public key from file
receiversKeys = self.keyGeneration.ReadReceiversKeys(False)
if len(receiversKeys) > 0:
encryptedMessage, header = tupleEncMsgHead[
0], tupleEncMsgHead[1]
primitiveElement = receiversKeys[0]
primitiveRaisedSecretModPrime = receiversKeys[1]
randomPrime = receiversKeys[2]
print(
"\nBreaking Encyption (using Baby Step Giant Step Algorithm)..."
)
self.__PerformBabyStepGiantStep(
encryptedMessage, header, primitiveElement,
primitiveRaisedSecretModPrime, randomPrime)
except Exception as ex:
print(
"An error occurred in function BreakEncryption.BreakEncryptionGetMessage while processing. Error: ",
ex)
#To perform Baby-Step-Giant-Step algorithm using Receiver's public keys and Header to break Encryption
# and get the original message
def __PerformBabyStepGiantStep(self, encryptedMessage, header,
primitiveElement,
primitiveRaisedSecretModPrime, randomPrime):
try:
randomVar = self.__ComputePowerVariable(header, primitiveElement,
randomPrime)
#print("randomVar:", randomVar)
if randomVar == -1:
print(
"\nBaby Step Giant Step failed to break encryption for given Public Key and Header combination."
)
print(
"Please try again for a different Receiever\'s Public Key and Header combination..."
)
else:
#Encrypted Message = message * (c^b mod p) mod p
#message = Encrypted Message * Inverse of (c^b mod p) mod p
#c^b mod p
primitiveRaisedSecRaisedRandomModPrime = self.common.GetExponentiation(
primitiveRaisedSecretModPrime, randomVar, randomPrime)
#print("primitiveRaisedSecRaisedRandomModPrime:", primitiveRaisedSecRaisedRandomModPrime)
#message = Encrypted Message * Inverse of (c^b mod p) mod p
message = (encryptedMessage *
self.decryption.GetInverseModPrime(
primitiveRaisedSecRaisedRandomModPrime,
randomPrime)) % randomPrime
print("\nCracked Original Message:", message)
except Exception as ex:
print(
"An error occurred in function BreakEncryption.__PerformBabyStepGiantStep while processing. Error: ",
ex)
#In the equation a = b ^ c mod n, below function computes 'c'
# Representationally: answerVar = baseVar ^ powerVar Mod prime
def __ComputePowerVariable(self, answerVar, baseVar, prime):
try:
dictLHS, dictRHS = {}, {}
m = int(math.ceil(math.sqrt(prime - 1)))
#print("m:", m)
invBaseVar = self.decryption.GetInverseModPrime(baseVar, prime)
#print("invBaseVar:", invBaseVar)
invBaseVarRaisedm = self.common.GetExponentiation(
invBaseVar, m, prime)
#print("invBaseVarRaisedm:", invBaseVarRaisedm)
#answerVar * (invBaseVar ^ m) ^ i = baseVar ^ j
#where 0 <= i <=m
#and 0 <= j < m
#All L.H.S. values of equation answerVar * (invBaseVar ^ m) ^ i = baseVar ^ j
for i in range(m + 1):
valueLHS = (self.common.GetExponentiation(
invBaseVarRaisedm, i, prime) * answerVar) % prime
dictLHS[i] = valueLHS
#All R.H.S. values of equation answerVar * (invBaseVar ^ m) ^ powerVar = baseVar ^ otherPowerVar
for j in range(m):
valueRHS = self.common.GetExponentiation(baseVar, j, prime)
dictRHS[j] = valueRHS
listCombinationTuple = [(i, j) for i in dictLHS for j in dictRHS
if dictLHS[i] == dictRHS[j]]
#print("listCombinationTuple:", listCombinationTuple)
if len(listCombinationTuple) > 0:
powerVar = int((listCombinationTuple[0][0] * m) +
listCombinationTuple[0][1])
else:
#Baby-Step-Giant-Step algorithm failed to crack encryption
powerVar = -1
#print("powerVar:", powerVar)
return powerVar
except Exception as ex:
print(
"An error occurred in function BreakEncryption.__ComputePowerVariable while processing. Error: ",
ex)
def main():
# For the integration testing I will take plain txt from usr converting into binary string giving it to Encryption block to
# encrypt it so that it gives out cypher text. which is tored in image
# after extraaction of cypher txt from stegeo img it will be given to the decryption module
# Decryptor decrypt it to yield plain txt.
plain_text = input("Enter a plain text : ")
#example : This World shall Know Pain
print(f"Entered plian Txt : {plain_text}")
preprocessor = Preprocessing()
#convert to binary
plain_2_binary_string = preprocessor.string_2_binary(plain_text)
#append the length in front of 25 bit
prepended_binary_string = preprocessor.prepend_length_of_binary_string(
plain_2_binary_string)
#padding with zeroes that binary string so that it is a multiple of 128.
padded_binary_string = preprocessor.padding_of_text(
prepended_binary_string)
#ENCRYPTION
encryptor = Encryption()
print(f"Padded Binary string pt1_txt --> : {padded_binary_string}")
print('\n\n')
cipher_text = ""
pt1_txt = padded_binary_string
for i in range(0, len(padded_binary_string), 128):
string_128_bit = padded_binary_string[i:i + 128]
#Encryption starts
EI_S = preprocessor.Convert128_to_32bits(string_128_bit)
keys = "11110111110000001010010111101001101111101000101000000000111111111111000000001111111011011100010101010010101101010101000010111111"
KEYS = preprocessor.Convert128_to_32bits(keys)
C1, C2, C3, C4 = encryptor.Encrypt(EI_S, KEYS)
cipher_text += C1 + C2 + C3 + C4
print("cipher_text\n", cipher_text)
print('\n')
print("pt1_txt\n", pt1_txt)
print("\n\n")
ct_text = cipher_text
#prepended the length of cypher text in front of 25 bit i.e first 25 bit shows length of cypher text
prepended_cypher_txt = preprocessor.prepend_length_of_binary_string(
cipher_text)
#padd it now this cypher txt -->prepended_cypher_txt to padded_cypher_txt
padded_cypher_txt = preprocessor.padding_of_text(prepended_cypher_txt)
#Now the padded cypher text -->padded_cypher_txt will go inside the image and image will be called after insertion as
#steogo image
#Now we have to extract LSB of whole image (or it can be modified / optimized further )
cypher_txt_after_extraction = preprocessor.extract_real_binary_string(
padded_cypher_txt)
#DECRYPTION
padded_pt_text = ""
decryptor = Decryption()
for i in range(0, len(cypher_txt_after_extraction), 128):
cypher_128_bit = cypher_txt_after_extraction[i:i + 128]
#print("###",i , i+128 , string_128_bit)
#print('\n\n')
CT_S = preprocessor.Convert128_to_32bits(cypher_128_bit)
keys = "11110111110000001010010111101001101111101000101000000000111111111111000000001111111011011100010101010010101101010101000010111111"
KEYS = preprocessor.Convert128_to_32bits(keys)
#print("\n\nKEYS : ",KEYS)
#print('\n\n')
E1, E2, E3, E4 = decryptor.Decrypt(CT_S, KEYS)
padded_pt_text += E1 + E2 + E3 + E4
print("padded_pt_text\n", padded_pt_text)
print('\n')
print("Ab bata jara ", end="")
print(pt1_txt == padded_pt_text)
#Now extracting actual binary string from padded plain txt
real_pt_text = preprocessor.extract_real_binary_string(padded_pt_text)
#Now convert this real plain txt into Ascii text
real_plain_text = preprocessor.binary_2_string(real_pt_text)
print(
f"\n\n\n\n\n\n\n\n\n After all the actual text was :--> {real_plain_text}\n\n\n\n\n\n\n\n\n"
)
def __init__( self, encryption_encoded_key, integrity_encoded_key):
iv_length = 16;
is_length = 4;
byte_length = 20;
self.decrypt = Decryption.__init__( self, encryption_encoded_key, integrity_encoded_key, iv_length, is_length, byte_length );
* facebook : /viral4ever
* google+ : /+ViralJoshi
* twitter : /viralhj
* linkedin : /in/viralj
*
*
*/
required python version : Python 3.0+
"""
from Encryption import Encryption # Importing custom Encryption class
from Decryption import Decryption # Importing custom Decryption class
import time # Importing for time delay
a = str(input("Please enter ENCRYPTION or DECRYPTION : ")).lower() # Need user input to know next action
"""
Action for Encryption or Decryption
starts from here.
"""
if a == "encryption":
b = str(input("Please enter a string : "))
Encryption.encryption(b)
elif a == "decryption":
Decryption.decryption()
else:
print("Wrong answer! Good bye...")
time.sleep(1)
exit()
from Encryption import Encryption
from Decryption import Decryption
from Encoding import Encoding
# Fix --- Handle One Character -> Also, Build Interface
# Instances of Classes
encryp = Encryption()
decrypt = Decryption()
encode = Encoding()
message = raw_input("Enter your message: ")
count = 0
count2 = 0
while len(message) == 0 and count2 != 1:
if count2 == 1:
print "Try again some other time."
count2 += 1
message = raw_input("Enter some text for your message: ")
print
while encode.checkCharacters(message) and count2 < 1:
if count == 1:
print "There was a character in your message that is not supported.\nPlease try again later."
break
count += 1
print "Please enter only the following characters within your message:\nA-Z\n.\n?\n,\n:\nspace\n'\n_____________________________________________"
message = raw_input("Re-enter your message: ")
if count < 2 and count2 < 2:
def Crpyto_Decryptor(
self, cipher_text, k, flag
): #this flag value will tell whether the cypher text you are giving is original (flag==0) or else its is flag==1 is appended by its length i.e whether it is extracted from the stegeo image
# encrypt it so that it gives out cypher text. which is tored in image
# after extraaction of cypher txt from stegeo img it will be given to the decryption module
# Decryptor decrypt it to yield plain txt.
#Also note the argument k is for keys
preprocessor = Preprocessing()
# #prepended the length of cypher text in front of 25 bit i.e first 25 bit shows length of cypher text
# prepended_cypher_txt = preprocessor.prepend_length_of_binary_string(cipher_text)
ct_text = cipher_text
# #padd it now this cypher txt -->prepended_cypher_txt to padded_cypher_txt
# padded_cypher_txt = preprocessor.padding_of_text(prepended_cypher_txt)
# #Now the padded cypher text -->padded_cypher_txt will go inside the image and image will be called after insertion as
# #steogo image
# #Now we have to extract LSB of whole image (or it can be modified / optimized further )
if flag == 1:
cypher_txt_after_extraction = preprocessor.extract_real_binary_string(
cipher_text)
else:
cypher_txt_after_extraction = cipher_text
#DECRYPTION
padded_pt_text = ""
keys = k
KEYS = preprocessor.Convert128_to_32bits(keys)
decryptor = Decryption()
for i in range(0, len(cypher_txt_after_extraction), 128):
cypher_128_bit = cypher_txt_after_extraction[i:i + 128]
#print("###",i , i+128 , string_128_bit)
#print('\n\n')
CT_S = preprocessor.Convert128_to_32bits(cypher_128_bit)
#keys = "11110111110000001010010111101001101111101000101000000000111111111111000000001111111011011100010101010010101101010101000010111111"
E1, E2, E3, E4 = decryptor.Decrypt(CT_S, KEYS)
padded_pt_text += E1 + E2 + E3 + E4
print("padded_pt_text\n", padded_pt_text)
print('\n')
# print("Ab bata jara ",end="")
# print(pt1_txt==padded_pt_text)
#Now extracting actual binary string from padded plain txt
#real_pt_text = preprocessor.extract_real_binary_string(padded_pt_text)
real_pt_text = padded_pt_text
#Now convert this real plain txt into Ascii text
real_plain_text = preprocessor.binary_2_string(real_pt_text)
print(
f"\n\n\n\n\n\n\n\n\n After all the actual text was :--> {real_plain_text}\n\n\n\n\n\n\n\n\n"
)
return (ct_text, real_plain_text)
