def main():
keys = generate_keys("lqjxliang")
plaintext_list = []
ciphertext_list = []
for i in range(256):
t = [1]
diff = random.randint(1, 63)
for j in range(63):
if j == diff:
t.append(1)
else:
t.append(0)
plaintext_list.append(t)
for plaintext in plaintext_list:
ciphertext_list.append(DES(plaintext, 0, 64, keys))
# Do statistics
count = []
rate = []
for i in range(64):
t = 0
for ciphertext in ciphertext_list:
if ciphertext[i] == '0':
t += 1
count.append(t)
rate.append(t / 256.0)
print(count)
print(rate)
def encrypt(plaintext, key_text, iv_bits): keys = generate_keys(key_text) text_bits = get_bits(plaintext) text_bits = add_pads_if_necessary(text_bits) results = map(int, iv_bits) for i in text_bits: text_bits[i] ^= results[i] final_cipher = '' for i in range(0, len(text_bits), 64): final_cipher += DES(text_bits, i, (i+64), keys)
def encrypt(plaintext, key_text):
keys = generate_keys(key_text)
text_bits = get_bits(plaintext)
text_bits = add_pads_if_necessary(text_bits)
final_cipher = ''
for i in range(0, len(text_bits), 64):
final_cipher += DES(text_bits, i, (i + 64), keys)
# conversion of binary cipher into hex-decimal form
hex_cipher = ''
i = 0
while i < len(final_cipher):
hex_cipher += bin_to_hex(final_cipher[i:i + 4])
i = i + 4
return hex_cipher
def encrypt(plaintext, key_text): keys = generate_keys(key_text) text_bits = get_bits(plaintext) text_bits = add_pads_if_necessary(text_bits) final_cipher = '' for i in range(0, len(text_bits), 64): final_cipher += DES(text_bits, i, (i+64), keys) # conversion of binary cipher into hex-decimal form hex_cipher = '' i = 0 while i < len(final_cipher): hex_cipher += bin_to_hex(final_cipher[i:i+4]) i = i+4 return hex_cipher
def encrypt(plaintext, iv_bits): key_text = "kij12345" keys = generate_keys(key_text) text_bits = get_bits(plaintext) text_bits = add_pads_if_necessary(text_bits) results = map(int, iv_bits) for i in text_bits: text_bits[i] ^= results[i] final_cipher = '' for i in range(0, len(text_bits), 64): final_cipher += DES(text_bits, i, (i+64), keys) hex_cipher = '' i = 0 while i < len(final_cipher): hex_cipher += bin_to_hex(final_cipher[i:i+4]) i = i+4 return hex_cipher, final_cipher
def main():
keys = generate_keys('lqjxliang')
plaintext = str(raw_input('Enter the first message to be encrypted\n'))
text_bits = get_bits(plaintext)
text_bits = add_pads_if_necessary(text_bits)
CIPHERS1 = []
for i in range(0, len(text_bits), 64):
DES(text_bits, i, (i + 64), keys, CIPHERS1)
text_bits = []
plaintext = str(raw_input('Enter the second message to be encrypted\n'))
text_bits = get_bits(plaintext)
text_bits = add_pads_if_necessary(text_bits)
CIPHERS2 = []
for i in range(0, len(text_bits), 64):
DES(text_bits, i, (i + 64), keys, CIPHERS2)
print("for plaintext one:")
for i in range(16):
ans = ""
for each in CIPHERS1[i]:
ans += str(each)
print("The cipher after " + str(i) + " rounds is " + ans)
print("for plaintext two:")
for i in range(16):
ans = ""
for each in CIPHERS2[i]:
ans += str(each)
print("The cipher after " + str(i) + " rounds is " + ans)
for i in range(16):
count = 0
for j in range(64):
if not CIPHERS2[i][j] == CIPHERS1[i][j]:
count += 1
print("After " + str(i) + " round differnt bits is: " + str(count))
def decrypt(cipher, key_text):
keys = generate_keys(key_text)
text_bits = []
ciphertext = ''
for i in cipher:
# conversion of hex-decimal form to binary form
ciphertext += hex_to_bin(i)
for i in ciphertext:
text_bits.append(int(i))
text_bits = add_pads_if_necessary(text_bits)
keys.reverse()
bin_mess = ''
for i in range(0, len(text_bits), 64):
bin_mess += DES(text_bits, i, (i + 64), keys)
i = 0
text_mess = ''
while i < len(bin_mess):
text_mess += bin_to_text(bin_mess[i:i + 8])
i = i + 8
return text_mess.rstrip('\x00')
def decrypt(cipher, key_text):
keys = generate_keys(key_text)
text_bits = []
ciphertext = ''
for i in cipher:
# conversion of hex-decimal form to binary form
ciphertext += hex_to_bin(i)
for i in ciphertext:
text_bits.append(int(i))
text_bits = add_pads_if_necessary(text_bits)
keys.reverse()
bin_mess = ''
for i in range(0, len(text_bits), 64):
bin_mess += DES(text_bits, i, (i+64), keys)
i = 0
text_mess = ''
while i < len(bin_mess):
text_mess += bin_to_text(bin_mess[i:i+8])
i = i+8
return text_mess.rstrip('\x00')
def decrypt(cipher): #cipher hexadecimal dan key 8 character
key_text = "kij12345"
keys = generate_keys(key_text) # key dirubah ke biner
text_bits = []
ciphertext = ''
ciphertemp = []
for i in cipher:
# conversion of hex-decimal form to binary form
ciphertext += hex_to_bin(i)
ciphertemp = str(ciphertext)
for i in ciphertemp:
text_bits.append(i)
xx = 0
text_temp = []
for xx in range(0,len(text_bits)/64):
ho = len(text_bits)/64
temp = []
aa = 0
while aa < 64:
temp += text_bits.pop(0)
aa = aa + 1
temp_new = []
for i in temp:
temp_new.append(int(i))
#print "keys sebelum reverse->",keys
if xx == 0:
keys.reverse()
bin_mess = ''
for i in range(0, len(temp_new), 64):
bin_mess += DES(temp_new, i, (i+64), keys)
i = 0
text_mess = ''
while i < len(bin_mess):
text_mess += bin_to_text(bin_mess[i:i+8])
i = i+8
# print "ini text mess bawah->", text_mess
final_gan = []
final_gan.append(text_mess.rstrip('\x1c'))
#print "ini hasil iterasi ke ", xx+1, final_gan
text_temp.append(text_mess)
final_temp = ''.join(text_temp)
return final_temp.rstrip('\x00')
for i in temp:
# conversion of hex-decimal form to binary form
ciphertext += hex_to_bin(i)
for i in ciphertext:
text_bits.append(int(i))
text_bits = add_pads_if_necessary(text_bits)
keys.reverse()
bin_mess = ''
for i in range(0, len(text_bits), 64):
bin_mess += DES(text_bits, i, (i+64), keys)
i = 0
text_mess = ''
while i < len(bin_mess):
text_mess += bin_to_text(bin_mess[i:i+8])
i = i+8
return text_mess.rstrip('\x00')
def decrypt(cipher, key_text): #cipher hexadecimal dan key 8 character keys = generate_keys(key_text) # key dirubah ke biner text_bits = [] ciphertext = ''
def decrypt(temp, key_text): keys = generate_keys(key_text)
bin_list = []
for i in range(0, len(text_bits), 64):
bin_list += DES(text_bits, i, (i + 64), keys)
if i > 0:
for j in range(i, i + 64):
bin_list[j] = str(int(bin_list[j]) ^ text_bits[j - 64])
else:
for j in range(i, i + 64):
bin_list[j] = str(int(bin_list[j]) ^ iv[j])
bin_mess = "".join(bin_list)
text_mess = header_str + bin_mess
i = 0
fo = open("decrypted_cbc.bmp", 'ab')
print("The length of final_cipher")
print(len(text_mess))
while i < len(text_mess) - 8:
val = bin_to_dec(text_mess[i:i + 4]) * 16 + bin_to_dec(
text_mess[i + 4:i + 8])
fo.write(struct.pack('B', val))
i += 8
fo.close()
print('the original image has been saved in decrypted_cbc.bmp')
if __name__ == '__main__':
keys = generate_keys('lqjxliang')
encode('img.bmp', keys)
#decode('leena.bmp', keys)
