def main():
keys = generate_keys("guogaoyang")
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 main():
keys = generate_keys("guogaoyang")
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 main():
keys = generate_keys('guogaoyang')
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 main():
keys = generate_keys('guogaoyang')
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))
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", 'wb')
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('guogaoyang')
encode('lena.bmp', keys)
decode('encrypted_cbc.bmp', keys)
header_bits = cipher_bits[0:HEADER_LENGTH]
text_bits = cipher_bits[HEADER_LENGTH:]
for i in header_bits:
header_str += str(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)
text_mess = header_str + bin_mess
i = 0
fo = open("decrypted_ecb.bmp", 'wb')
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_ecb.bmp')
if __name__ == '__main__':
keys = generate_keys('guogaoyang')
encode('lena.bmp', keys)
decode('encrypted_ecb.bmp', keys)
