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des_dna.py
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#TRIPLE-DES-CODE
#get the input message
# Function to convert input string to ASCII values and pad if necessary
def convert_to_ascii(input_string):
ascii_values = ""
for char in input_string:
ascii_val = str(ord(char))
ascii_values += ascii_val
if len(ascii_values) < 32:
ascii_values = ascii_values.ljust(32, '0') # Appending zeros at the end if length is less than 32
return ascii_values
# Function to read message from a file
def read_message_from_file(file_path):
with open(file_path, 'r') as file:
message = file.read().strip() # Read the message and remove leading/trailing whitespace
return message
# Read the input message from the file
file_path = "input_message.txt" # Specify your file path here
input_string_original = read_message_from_file(file_path)
# Convert the message to ASCII values
hex_input_message = convert_to_ascii(input_string_original)
print("ASCII values:", hex_input_message)
#get three input keys
hex_input_key_1=input("enter the key 1:");
hex_input_key_2=input("enter the key 2:");
hex_input_key_3=input("enter the key 3:");
#Encryption function
def Encryption(hex_input_message,hex_input_key):
# Function to convert a given hexadecimal message and key to binary
def hex_to_binary(hex_str):
hex_to_bin_mapping = {
'0': '0000',
'1': '0001',
'2': '0010',
'3': '0011',
'4': '0100',
'5': '0101',
'6': '0110',
'7': '0111',
'8': '1000',
'9': '1001',
'A': '1010',
'B': '1011',
'C': '1100',
'D': '1101',
'E': '1110',
'F': '1111'
}
binary_str = ""
for value in hex_str:
binary_str += hex_to_bin_mapping[value]
return binary_str
# Function to convert the converted binary message or key to DNA sequence
def binary_to_dna(binary_str):
binary_dna_mapping= {
'00': 'A',
'01': 'C',
'10': 'G',
'11': 'T'
}
dna_seq = ''
for i in range(0, len(binary_str), 2):
dna_seq += binary_dna_mapping[binary_str[i:i+2]]
return dna_seq
#to get the inputfor the key
binary_output_key = hex_to_binary(hex_input_key)
dna_sequence_key = binary_to_dna(binary_output_key)
print("DNA Sequence for key:", dna_sequence_key)
binary_output_message = hex_to_binary(hex_input_message)
dna_sequence_message = binary_to_dna(binary_output_message)
print("DNA Sequence for message:", dna_sequence_message)
def permute(key, permutation):
return ''.join(key[i - 1] for i in permutation)
def generate_round_keys(dna_sequence_key):
#permutation 1 table for round key generation
PC1 = [57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4]
#permutation 2 table for round key generation
PC2 = [14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53,
46, 42, 50, 36, 29, 32]
#shifting based on the rounds
rotations = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
round_keys = []
key = permute(dna_sequence_key, PC1)
#dividing the 56 bits into two 28 bits
C = key[:28]
D = key[28:]
for i in range(16):
C = C[rotations[i]:] + C[:rotations[i]]
D = D[rotations[i]:] + D[:rotations[i]]
CD = C + D
round_key = permute(CD, PC2)
round_keys.append(round_key)
return round_keys
#round key generation
round_keys = generate_round_keys(dna_sequence_key)
print("THE KEYS AFTER ROUND KEY GENERATION ARE")
for i, key in enumerate(round_keys):
print(f"K{i+1} =", key)
#initial permutation
def initial_permutation(dna_sequence_message):
initial_perm = [58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7]
initial_permutation_messages=[];
initial_permutation_message = permute(dna_sequence_message, initial_perm)
initial_permutation_messages.append(initial_permutation_message)
return(initial_permutation_message)
initial_permutation_output=initial_permutation(dna_sequence_message)
print("After initial_permutation_output:");
print(initial_permutation_output)
#dividing the initial permutation output
length=len(initial_permutation_output)//2
L0=initial_permutation_output[:length]
R0=initial_permutation_output[length:]
print("L0=",L0)
print("R0=",R0)
#performing the expansion d permutation on the right side part
def expansion_function(R0):
exp_d = [32, 1, 2, 3, 4, 5, 4, 5,
6, 7, 8, 9, 8, 9, 10, 11,
12, 13, 12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21, 20, 21,
22, 23, 24, 25, 24, 25, 26, 27,
28, 29, 28, 29, 30, 31, 32, 1]
expansion_permutation_messages=[];
expansion_permutation_message = permute(R0,exp_d)
expansion_permutation_messages.append(expansion_permutation_message)
return(expansion_permutation_message)
expansion_permutation_output=expansion_function(R0)
print("After expansion_permutation_output:");
print(expansion_permutation_output)
#performing dna xor function
def dna_xor(nucleotide1, nucleotide2):
xor_table = {
('A', 'A'): 'A',
('A', 'C'): 'C',
('A', 'G'): 'G',
('A', 'T'): 'T',
('C', 'A'): 'C',
('C', 'C'): 'A',
('C', 'G'): 'T',
('C', 'T'): 'G',
('G', 'A'): 'G',
('G', 'C'): 'T',
('G', 'G'): 'A',
('G', 'T'): 'C',
('T', 'A'): 'T',
('T', 'C'): 'G',
('T', 'G'): 'C',
('T', 'T'): 'A'
}
return xor_table[(nucleotide1, nucleotide2)]
# Assuming expansion_permutation_output and round_keys[0] are sequences of nucleotides
xor_result = ''.join(dna_xor(n1, n2) for n1, n2 in zip(expansion_permutation_output, round_keys[0]))
print("XOR result:", xor_result)
# DNA S-Box tables
s_box_s1= {
'A': {'AA':'TG', 'AC':'AA', 'AG': 'CA', 'AT': 'TT', 'CA': 'TC', 'CC': 'CT', 'CG': 'AC', 'CT': 'CA',
'GA': 'AG', 'GC': 'TG', 'GG': 'TT', 'GT': 'AG', 'TA': 'GT', 'TC': 'TC', 'TG': 'GA', 'TT': 'AC'},
'C': {'AA': 'AT', 'AC': 'GG', 'AG': 'GG', 'AT': 'CG', 'CA': 'CG', 'CC': 'TA', 'CG': 'TA', 'CT': 'GT',
'GA': 'CC', 'GC': 'GC', 'GG': 'GC', 'GT': 'CC', 'TA': 'AA', 'TC': 'AT', 'TG': 'CT', 'TT': 'GA'},
'G': {'AA': 'CA', 'AC': 'TT', 'AG': 'AC', 'AT': 'TA', 'CA': 'TG', 'CC': 'GA', 'CG': 'GA', 'CT': 'AG',
'GA': 'TC', 'GC': 'CA', 'GG': 'CG', 'GT': 'GC', 'TA': 'AG', 'TC': 'AC', 'TG': 'GT', 'TT': 'CT'},
'T': {'AA': 'TT', 'AC': 'CC', 'AG': 'TA', 'AT': 'GT', 'CA': 'GC', 'CC': 'AT', 'CG': 'CT', 'CT': 'TG',
'GA': 'AT', 'GC': 'GG', 'GG': 'GG', 'GT': 'AA', 'TA': 'CC', 'TC': 'CG', 'TG': 'AA', 'TT':'TC'}}
s_box_s2= {
'A': {'AA': 'TT', 'AC': 'AT', 'AG': 'AC', 'AT': 'TC', 'CA': 'GA', 'CC': 'CA', 'CG': 'TG', 'CT': 'CT',
'GA': 'CG', 'GC': 'TT', 'GG': 'GT', 'GT': 'AG', 'TA': 'AT', 'TC': 'GA', 'TG': 'CA', 'TT': 'TG'},
'C': {'AA': 'GC', 'AC': 'TA', 'AG': 'CT', 'AT': 'AA', 'CA': 'AG', 'CC': 'AC', 'CG': 'TC', 'CT': 'GG',
'GA': 'TA', 'GC': 'CG', 'GG': 'AA', 'GT': 'GC', 'TA': 'CC', 'TC': 'GT','TG': 'GG', 'TT': 'CC'},
'G': {'AA': 'AA', 'AC': 'TC', 'AG': 'TG', 'AT': 'GA', 'CA': 'CT', 'CC': 'GG', 'CG': 'GT', 'CT': 'AC',
'GA': 'GG', 'GC': 'AT', 'GG': 'CA', 'GT': 'TT', 'TA': 'TC', 'TC': 'CA', 'TG': 'AC', 'TT': 'AG'},
'T': {'AA': 'CC', 'AC': 'GT', 'AG': 'GA', 'AT': 'CG', 'CA': 'TA', 'CC': 'CT', 'CG': 'CG', 'CT': 'TA',
'GA': 'GC', 'GC': 'AA', 'GG': 'AT', 'GT': 'CC', 'TA': 'AG', 'TC': 'TG', 'TG': 'TT', 'TT':'GC'}}
s_box_s3= {
'A': {'AA': 'GG', 'AC': 'TC', 'AG': 'AA', 'AT': 'CT', 'CA': 'GC', 'CC': 'AA', 'CG': 'TG', 'CT': 'GC',
'GA': 'CG', 'GC': 'AT', 'GG': 'AT', 'GT': 'CA', 'TA': 'TT', 'TC': 'CG', 'TG': 'CC', 'TT': 'GG'},
'C': {'AA': 'AC', 'AC': 'AG', 'AG': 'TC', 'AT': 'GA', 'CA': 'TA', 'CC': 'CC', 'CG': 'CT', 'CT': 'TG',
'GA': 'GT', 'GC': 'TA', 'GG': 'CA', 'GT': 'GT', 'TA': 'AG', 'TC': 'TT', 'TG': 'GA', 'TT': 'AC'},
'G': {'AA': 'TC', 'AC': 'AC', 'AG': 'CG', 'AT': 'GG', 'CA': 'CA', 'CC': 'TC', 'CG': 'GC', 'CT': 'AA',
'GA': 'GA', 'GC': 'CG', 'GG': 'TT', 'GT': 'GC', 'TA': 'AT', 'TC': 'GA', 'TG': 'AA', 'TT': 'CT'},
'T': {'AA': 'GT', 'AC': 'CA', 'AG': 'AC', 'AT': 'TT', 'CA': 'AG', 'CC': 'TG', 'CG': 'TA', 'CT': 'AT',
'GA': 'CC', 'GC': 'GT', 'GG': 'GG', 'GT': 'CC', 'TA': 'TG', 'TC': 'AG', 'TG': 'CT', 'TT':'TA'}}
s_box_s4 = {
'A': {'AA': 'CT', 'AC': 'TC', 'AG': 'TC', 'AT': 'GA', 'CA': 'TG', 'CC': 'GT', 'CG': 'AT', 'CT': 'CC',
'GA': 'AA', 'GC': 'CG', 'GG': 'CG', 'GT': 'TT', 'TA': 'GC', 'TC': 'AA', 'TG': 'GG', 'TT': 'AT'},
'C': {'AA': 'AC', 'AC': 'CA', 'AG': 'AG', 'AT': 'CT', 'CA': 'GA', 'CC': 'AG', 'CG': 'CC', 'CT': 'TA',
'GA': 'GT', 'GC': 'AC', 'GG': 'TA', 'GT': 'GG', 'TA': 'CA', 'TC': 'TG', 'TG': 'TT', 'TT': 'GC'},
'G': {'AA': 'GG', 'AC': 'AT', 'AG': 'CG', 'AT': 'TT', 'CA': 'GC', 'CC': 'AA', 'CG': 'AA', 'CT': 'CG',
'GA': 'TA', 'GC': 'GG', 'GG': 'GT', 'GT': 'AC', 'TA': 'CT', 'TC': 'TC', 'TG': 'TC', 'TT': 'GA'},
'T': {'AA': 'TT', 'AC': 'GC', 'AG': 'AC', 'AT': 'CA', 'CA': 'AT', 'CC': 'CC', 'CG': 'TG', 'CT': 'GT',
'GA': 'CC', 'GC': 'TA', 'GG': 'AG', 'GT': 'CT', 'TA': 'GA', 'TC': 'AG', 'TG': 'CA', 'TT':'TG'}}
s_box_s5= {
'A': {'AA': 'AG', 'AC': 'TG', 'AG': 'TA', 'AT': 'GT', 'CA': 'CA', 'CC': 'AG', 'CG': 'AC', 'CT': 'TA',
'GA': 'CT', 'GC': 'CA', 'GG': 'GG', 'GT': 'CT', 'TA': 'GT', 'TC': 'TC', 'TG': 'CG', 'TT': 'AC'},
'C': {'AA': 'GA', 'AC': 'CC', 'AG': 'CC', 'AT': 'AA', 'CA': 'AT', 'CC': 'TT', 'CG': 'TT', 'CT': 'GG',
'GA': 'TC', 'GC': 'AT', 'GG': 'AA', 'GT': 'GC', 'TA': 'TG', 'TC': 'GA', 'TG': 'GC', 'TT': 'CG'},
'G': {'AA': 'CA', 'AC': 'GT', 'AG': 'AG', 'AT': 'GA', 'CA': 'AC', 'CC': 'TA', 'CG': 'GT', 'CT': 'CT',
'GA': 'GG', 'GC': 'AC', 'GG': 'TC', 'GT': 'TG', 'TA': 'CT', 'TC': 'AG', 'TG': 'GA', 'TT': 'TC'},
'T': {'AA': 'TT', 'AC': 'CG', 'AG': 'GC', 'AT': 'TT', 'CA': 'TA', 'CC': 'AA', 'CG': 'CC', 'CT': 'GC',
'GA': 'CG', 'GC': 'GG', 'GG': 'AT', 'GT': 'CA', 'TA': 'AA', 'TC': 'CC', 'TG': 'TG', 'TT':'AT'}}
s_box_s6= {
'A': {'AA': 'TA', 'AC': 'GG', 'AG': 'AC', 'AT': 'TT', 'CA': 'GG', 'CC': 'CA', 'CG': 'TT', 'CT': 'AG',
'GA': 'GC', 'GC': 'CT', 'GG': 'AG', 'GT': 'TA', 'TA': 'CG', 'TC': 'GC', 'TG': 'GA', 'TT': 'CC'},
'C': {'AA': 'AA', 'AC': 'CG', 'AG': 'TC', 'AT': 'AC', 'CA': 'AT', 'CC': 'TC', 'CG': 'CA', 'CT': 'TG',
'GA': 'TG', 'GC': 'AA', 'GG': 'CT', 'GT': 'GT', 'TA': 'CC', 'TC': 'AT', 'TG': 'GT', 'TT': 'GA'},
'G': {'AA': 'GC', 'AC': 'CA', 'AG': 'TG', 'AT': 'AT', 'CA': 'TT', 'CC': 'AG', 'CG': 'CC', 'CT': 'TA',
'GA': 'AG', 'GC': 'GC', 'GG': 'GA', 'GT': 'CC', 'TA': 'TA', 'TC': 'TT', 'TG': 'AT', 'TT': 'GG'},
'T': {'AA': 'CT', 'AC': 'GT', 'AG': 'AA', 'AT': 'TG', 'CA': 'CA', 'CC': 'AC', 'CG': 'GG', 'CT': 'CT',
'GA': 'AC', 'GC': 'CG', 'GG': 'TC', 'GT': 'AA', 'TA': 'GT', 'TC': 'GA', 'TG': 'CG', 'TT':'TC'}}
s_box_s7 = {
'A': {'AA': 'CA', 'AC': 'TC', 'AG': 'GT', 'AT': 'AA', 'CA': 'AG', 'CC': 'GT', 'CG': 'TG', 'CT': 'CT',
'GA': 'TT', 'GC': 'CA', 'GG': 'AA', 'GT': 'GC', 'TA': 'GA', 'TC': 'AC', 'TG': 'TC', 'TT': 'GG'},
'C': {'AA': 'AT', 'AC': 'TG', 'AG': 'TA', 'AT': 'AT', 'CA': 'GC', 'CC': 'CC', 'CG': 'CT', 'CT': 'TA',
'GA': 'CC', 'GC': 'AG', 'GG': 'GG', 'GT': 'TT', 'TA': 'CG', 'TC': 'GA', 'TG': 'AC', 'TT': 'CG'},
'G': {'AA': 'AC', 'AC': 'CG', 'AG': 'CA', 'AT': 'GT', 'CA': 'GT', 'CC': 'TC', 'CG': 'TC', 'CT': 'GA',
'GA': 'TA', 'GC': 'AC', 'GG': 'AT', 'GT': 'CA', 'TA': 'CT', 'TC': 'GG', 'TG': 'TG', 'TT': 'CT'},
'T': {'AA': 'GG', 'AC': 'GC', 'AG': 'TT', 'AT': 'CC', 'CA': 'CG', 'CC': 'AA', 'CG': 'GA', 'CT': 'TT',
'GA': 'AA', 'GC': 'TG', 'GG': 'CC', 'GT': 'AG', 'TA': 'GC', 'TC': 'AT', 'TG': 'AG', 'TT':'TA'}}
s_box_s8 = {
'A': {'AA': 'TC', 'AC': 'AC', 'AG': 'AG', 'AT': 'TT', 'CA': 'GA', 'CC': 'TC', 'CG': 'CA', 'CT': 'GA',
'GA': 'CG', 'GC': 'GG', 'GG': 'TT', 'GT': 'AT', 'TA': 'GT', 'TC': 'CT', 'TG': 'AC', 'TT': 'CA'},
'C': {'AA': 'GG', 'AC': 'TA', 'AG': 'GC', 'AT': 'CC', 'CA': 'AT', 'CC': 'CG', 'CG': 'TG', 'CT': 'GT',
'GA': 'CC', 'GC': 'AA', 'GG': 'AA', 'GT': 'TG', 'TA': 'TA', 'TC': 'GC', 'TG': 'CT', 'TT': 'AG'},
'G': {'AA': 'CT', 'AC': 'AG', 'AG': 'GT', 'AT': 'AC', 'CA': 'CA', 'CC': 'TG', 'CG': 'AC', 'CT': 'CT',
'GA': 'GC', 'GC': 'CA', 'GG': 'TA', 'GT': 'GG', 'TA': 'TG', 'TC': 'GA', 'TG': 'AG', 'TT': 'TC'},
'T': {'AA': 'AA', 'AC': 'TT', 'AG': 'CG', 'AT': 'TA', 'CA': 'GG', 'CC': 'GC', 'CG': 'TC', 'CT': 'AA',
'GA': 'TT', 'GC': 'AT', 'GG': 'AT', 'GT': 'CC', 'TA': 'CC', 'TC': 'CG', 'TG': 'GA', 'TT':'GT'}}
def divide_input(input_str):
nucleotides = [input_str[i:i+3] for i in range(0, len(input_str), 3)]
return nucleotides
nucleotides = divide_input(xor_result)
print("Divided nucleotides:", nucleotides)
def get_sbox_output(s_box, input_str):
output = ""
for i in range(0, len(input_str), 3):
block = input_str[i:i+3]
row = block[0]
col = block[1:]
output += s_box[row][col]
return output
def apply_sbox_to_nucleotides(nucleotides, s_boxes):
output = ""
for i, nucleotide in enumerate(nucleotides, start=1):
s_box_index = (i - 1) % len(s_boxes) # Calculate the index of the corresponding s-box
s_box = s_boxes[s_box_index]
output += get_sbox_output(s_box, nucleotide)
return output
s_boxes = [s_box_s1, s_box_s2, s_box_s3, s_box_s4, s_box_s5, s_box_s6, s_box_s7, s_box_s8] # List of S-boxes
output = apply_sbox_to_nucleotides(nucleotides, s_boxes)
print("Result after applying S-boxes:", output)
def apply_pbox(input_str, pbox_indices):
output_p = ''
for index in pbox_indices:
output_p += input_str[index - 1] # Subtract 1 to convert from 1-based to 0-based index
return output_p
pbox_indices = [
16, 7, 20, 21,
29, 12, 28, 17,
1, 15, 23, 26,
5, 18, 31, 10,
2, 8, 24, 14,
32, 27, 3, 9,
19, 13, 30, 6,
22, 11, 4, 25
]
permutated_output = apply_pbox(output, pbox_indices)
print("Permutated Output:", permutated_output)
def xor_with_L0(permutated_output, L0):
result = ''
for i in range(len(permutated_output)):
result += dna_xor(permutated_output[i], L0[i])
return result
R1=xor_with_L0(permutated_output,L0)
L1=R0
print("R1:",xor_with_L0(permutated_output,L0))
print("L1:",R0)
#function for printing key from k2 to k16
def round_function(L_prev, R_prev, round_key):
expanded_R = expansion_function(R_prev)
xor_result = ''.join(dna_xor(n1, n2) for n1, n2 in zip(expanded_R, round_key))
nucleotides = divide_input(xor_result)
s_box_output = apply_sbox_to_nucleotides(nucleotides, [s_box_s1,s_box_s2,s_box_s3,s_box_s4,
s_box_s5, s_box_s6, s_box_s7, s_box_s8])
permuted_output = apply_pbox(s_box_output, pbox_indices)
R_new = xor_with_L0(permuted_output, L_prev)
L_new = R_prev
return L_new, R_new
# Start from round 2 and go up to round 16
for i in range(2, 17):
round_key = round_keys[i-1] # Round keys are zero-indexed in the list
L1, R1 = round_function(L1, R1, round_key)
print(f"Round {i}:")
print("L{} =".format(i), L1)
print("R{} =".format(i), R1)
#function for final permutation
final_output = R1 + L1
print("Final Output:", final_output)
def final_permutation(final_output):
final_perm = [40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25]
final_permutation_messages=[];
final_permutation_message = permute(final_output,final_perm)
final_permutation_messages.append(final_permutation_message)
return(final_permutation_message)
final_permutation_output=final_permutation(final_output)
return final_permutation_output
def Decryption(final_output,hex_input_key):
# Function to convert a given hexadecimal message and key to binary
def hex_to_binary(hex_str):
hex_to_bin_mapping = {
'0': '0000',
'1': '0001',
'2': '0010',
'3': '0011',
'4': '0100',
'5': '0101',
'6': '0110',
'7': '0111',
'8': '1000',
'9': '1001',
'A': '1010',
'B': '1011',
'C': '1100',
'D': '1101',
'E': '1110',
'F': '1111'
}
binary_str = ""
for value in hex_str:
binary_str += hex_to_bin_mapping[value]
return binary_str
# Function to convert the converted binary message or key to DNA sequence
def binary_to_dna(binary_str):
binary_dna_mapping= {
'00': 'A',
'01': 'C',
'10': 'G',
'11': 'T'
}
dna_seq = ''
for i in range(0, len(binary_str), 2):
dna_seq += binary_dna_mapping[binary_str[i:i+2]]
return dna_seq
binary_output_key = hex_to_binary(hex_input_key)
dna_sequence_key = binary_to_dna(binary_output_key)
def permute(key, permutation):
return ''.join(key[i - 1] for i in permutation)
def generate_round_keys(dna_sequence_key):
#permutation 1 table for round key generation
PC1 = [57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4]
#permutation 2 table for round key generation
PC2 = [14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53,
46, 42, 50, 36, 29, 32]
#shifting based on the rounds
rotations = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
round_keys = []
key = permute(dna_sequence_key, PC1)
#dividing the 56 bits into two 28 bits
C = key[:28]
D = key[28:]
for i in range(16):
C = C[rotations[i]:] + C[:rotations[i]]
D = D[rotations[i]:] + D[:rotations[i]]
CD = C + D
round_key = permute(CD, PC2)
round_keys.append(round_key)
return round_keys
round_keys = generate_round_keys(dna_sequence_key)
round_keys=round_keys[::-1]
print("THE KEYS AFTER ROUND KEY GENERATION ARE")
for i, key in enumerate(round_keys):
print(f"K{i+1} =", key)
def initial_permutation(final_output):
initial_perm = [58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7]
initial_permutation_messages=[];
initial_permutation_message = permute(final_output, initial_perm)
initial_permutation_messages.append(initial_permutation_message)
return(initial_permutation_message)
initial_permutation_output=initial_permutation(final_output)
print("After initial_permutation_output:");
print(initial_permutation_output)
#dividing the initial permutation output
length=len(initial_permutation_output)//2
L0=initial_permutation_output[:length]
R0=initial_permutation_output[length:]
print("L0=",L0)
print("R0=",R0)
#performing the expansion d permutation on the right side part
def expansion_function(R0):
exp_d = [32, 1, 2, 3, 4, 5, 4, 5,
6, 7, 8, 9, 8, 9, 10, 11,
12, 13, 12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21, 20, 21,
22, 23, 24, 25, 24, 25, 26, 27,
28, 29, 28, 29, 30, 31, 32, 1]
expansion_permutation_messages=[];
expansion_permutation_message = permute(R0,exp_d)
expansion_permutation_messages.append(expansion_permutation_message)
return(expansion_permutation_message)
expansion_permutation_output=expansion_function(R0)
print("After expansion_permutation_output:");
print(expansion_permutation_output)
def dna_xor(nucleotide1, nucleotide2):
xor_table = {
('A', 'A'): 'A',
('A', 'C'): 'C',
('A', 'G'): 'G',
('A', 'T'): 'T',
('C', 'A'): 'C',
('C', 'C'): 'A',
('C', 'G'): 'T',
('C', 'T'): 'G',
('G', 'A'): 'G',
('G', 'C'): 'T',
('G', 'G'): 'A',
('G', 'T'): 'C',
('T', 'A'): 'T',
('T', 'C'): 'G',
('T', 'G'): 'C',
('T', 'T'): 'A'
}
return xor_table[(nucleotide1, nucleotide2)]
# Assuming expansion_permutation_output and round_keys[0] are sequences of nucleotides
xor_result = ''.join(dna_xor(n1, n2) for n1, n2 in zip(expansion_permutation_output, round_keys[0]))
print("XOR result:", xor_result)
# DNA S-Box tables
s_box_s1= {
'A': {'AA':'TG', 'AC':'AA', 'AG': 'CA', 'AT': 'TT', 'CA': 'TC', 'CC': 'CT', 'CG': 'AC', 'CT': 'CA',
'GA': 'AG', 'GC': 'TG', 'GG': 'TT', 'GT': 'AG', 'TA': 'GT', 'TC': 'TC', 'TG': 'GA', 'TT': 'AC'},
'C': {'AA': 'AT', 'AC': 'GG', 'AG': 'GG', 'AT': 'CG', 'CA': 'CG', 'CC': 'TA', 'CG': 'TA', 'CT': 'GT',
'GA': 'CC', 'GC': 'GC', 'GG': 'GC', 'GT': 'CC', 'TA': 'AA', 'TC': 'AT', 'TG': 'CT', 'TT': 'GA'},
'G': {'AA': 'CA', 'AC': 'TT', 'AG': 'AC', 'AT': 'TA', 'CA': 'TG', 'CC': 'GA', 'CG': 'GA', 'CT': 'AG',
'GA': 'TC', 'GC': 'CA', 'GG': 'CG', 'GT': 'GC', 'TA': 'AG', 'TC': 'AC', 'TG': 'GT', 'TT': 'CT'},
'T': {'AA': 'TT', 'AC': 'CC', 'AG': 'TA', 'AT': 'GT', 'CA': 'GC', 'CC': 'AT', 'CG': 'CT', 'CT': 'TG',
'GA': 'AT', 'GC': 'GG', 'GG': 'GG', 'GT': 'AA', 'TA': 'CC', 'TC': 'CG', 'TG': 'AA', 'TT':'TC'}}
s_box_s2= {
'A': {'AA': 'TT', 'AC': 'AT', 'AG': 'AC', 'AT': 'TC', 'CA': 'GA', 'CC': 'CA', 'CG': 'TG', 'CT': 'CT',
'GA': 'CG', 'GC': 'TT', 'GG': 'GT', 'GT': 'AG', 'TA': 'AT', 'TC': 'GA', 'TG': 'CA', 'TT': 'TG'},
'C': {'AA': 'GC', 'AC': 'TA', 'AG': 'CT', 'AT': 'AA', 'CA': 'AG', 'CC': 'AC', 'CG': 'TC', 'CT': 'GG',
'GA': 'TA', 'GC': 'CG', 'GG': 'AA', 'GT': 'GC', 'TA': 'CC', 'TC': 'GT','TG': 'GG', 'TT': 'CC'},
'G': {'AA': 'AA', 'AC': 'TC', 'AG': 'TG', 'AT': 'GA', 'CA': 'CT', 'CC': 'GG', 'CG': 'GT', 'CT': 'AC',
'GA': 'GG', 'GC': 'AT', 'GG': 'CA', 'GT': 'TT', 'TA': 'TC', 'TC': 'CA', 'TG': 'AC', 'TT': 'AG'},
'T': {'AA': 'CC', 'AC': 'GT', 'AG': 'GA', 'AT': 'CG', 'CA': 'TA', 'CC': 'CT', 'CG': 'CG', 'CT': 'TA',
'GA': 'GC', 'GC': 'AA', 'GG': 'AT', 'GT': 'CC', 'TA': 'AG', 'TC': 'TG', 'TG': 'TT', 'TT':'GC'}}
s_box_s3= {
'A': {'AA': 'GG', 'AC': 'TC', 'AG': 'AA', 'AT': 'CT', 'CA': 'GC', 'CC': 'AA', 'CG': 'TG', 'CT': 'GC',
'GA': 'CG', 'GC': 'AT', 'GG': 'AT', 'GT': 'CA', 'TA': 'TT', 'TC': 'CG', 'TG': 'CC', 'TT': 'GG'},
'C': {'AA': 'AC', 'AC': 'AG', 'AG': 'TC', 'AT': 'GA', 'CA': 'TA', 'CC': 'CC', 'CG': 'CT', 'CT': 'TG',
'GA': 'GT', 'GC': 'TA', 'GG': 'CA', 'GT': 'GT', 'TA': 'AG', 'TC': 'TT', 'TG': 'GA', 'TT': 'AC'},
'G': {'AA': 'TC', 'AC': 'AC', 'AG': 'CG', 'AT': 'GG', 'CA': 'CA', 'CC': 'TC', 'CG': 'GC', 'CT': 'AA',
'GA': 'GA', 'GC': 'CG', 'GG': 'TT', 'GT': 'GC', 'TA': 'AT', 'TC': 'GA', 'TG': 'AA', 'TT': 'CT'},
'T': {'AA': 'GT', 'AC': 'CA', 'AG': 'AC', 'AT': 'TT', 'CA': 'AG', 'CC': 'TG', 'CG': 'TA', 'CT': 'AT',
'GA': 'CC', 'GC': 'GT', 'GG': 'GG', 'GT': 'CC', 'TA': 'TG', 'TC': 'AG', 'TG': 'CT', 'TT':'TA'}}
s_box_s4 = {
'A': {'AA': 'CT', 'AC': 'TC', 'AG': 'TC', 'AT': 'GA', 'CA': 'TG', 'CC': 'GT', 'CG': 'AT', 'CT': 'CC',
'GA': 'AA', 'GC': 'CG', 'GG': 'CG', 'GT': 'TT', 'TA': 'GC', 'TC': 'AA', 'TG': 'GG', 'TT': 'AT'},
'C': {'AA': 'AC', 'AC': 'CA', 'AG': 'AG', 'AT': 'CT', 'CA': 'GA', 'CC': 'AG', 'CG': 'CC', 'CT': 'TA',
'GA': 'GT', 'GC': 'AC', 'GG': 'TA', 'GT': 'GG', 'TA': 'CA', 'TC': 'TG', 'TG': 'TT', 'TT': 'GC'},
'G': {'AA': 'GG', 'AC': 'AT', 'AG': 'CG', 'AT': 'TT', 'CA': 'GC', 'CC': 'AA', 'CG': 'AA', 'CT': 'CG',
'GA': 'TA', 'GC': 'GG', 'GG': 'GT', 'GT': 'AC', 'TA': 'CT', 'TC': 'TC', 'TG': 'TC', 'TT': 'GA'},
'T': {'AA': 'TT', 'AC': 'GC', 'AG': 'AC', 'AT': 'CA', 'CA': 'AT', 'CC': 'CC', 'CG': 'TG', 'CT': 'GT',
'GA': 'CC', 'GC': 'TA', 'GG': 'AG', 'GT': 'CT', 'TA': 'GA', 'TC': 'AG', 'TG': 'CA', 'TT':'TG'}}
s_box_s5= {
'A': {'AA': 'AG', 'AC': 'TG', 'AG': 'TA', 'AT': 'GT', 'CA': 'CA', 'CC': 'AG', 'CG': 'AC', 'CT': 'TA',
'GA': 'CT', 'GC': 'CA', 'GG': 'GG', 'GT': 'CT', 'TA': 'GT', 'TC': 'TC', 'TG': 'CG', 'TT': 'AC'},
'C': {'AA': 'GA', 'AC': 'CC', 'AG': 'CC', 'AT': 'AA', 'CA': 'AT', 'CC': 'TT', 'CG': 'TT', 'CT': 'GG',
'GA': 'TC', 'GC': 'AT', 'GG': 'AA', 'GT': 'GC', 'TA': 'TG', 'TC': 'GA', 'TG': 'GC', 'TT': 'CG'},
'G': {'AA': 'CA', 'AC': 'GT', 'AG': 'AG', 'AT': 'GA', 'CA': 'AC', 'CC': 'TA', 'CG': 'GT', 'CT': 'CT',
'GA': 'GG', 'GC': 'AC', 'GG': 'TC', 'GT': 'TG', 'TA': 'CT', 'TC': 'AG', 'TG': 'GA', 'TT': 'TC'},
'T': {'AA': 'TT', 'AC': 'CG', 'AG': 'GC', 'AT': 'TT', 'CA': 'TA', 'CC': 'AA', 'CG': 'CC', 'CT': 'GC',
'GA': 'CG', 'GC': 'GG', 'GG': 'AT', 'GT': 'CA', 'TA': 'AA', 'TC': 'CC', 'TG': 'TG', 'TT':'AT'}}
s_box_s6= {
'A': {'AA': 'TA', 'AC': 'GG', 'AG': 'AC', 'AT': 'TT', 'CA': 'GG', 'CC': 'CA', 'CG': 'TT', 'CT': 'AG',
'GA': 'GC', 'GC': 'CT', 'GG': 'AG', 'GT': 'TA', 'TA': 'CG', 'TC': 'GC', 'TG': 'GA', 'TT': 'CC'},
'C': {'AA': 'AA', 'AC': 'CG', 'AG': 'TC', 'AT': 'AC', 'CA': 'AT', 'CC': 'TC', 'CG': 'CA', 'CT': 'TG',
'GA': 'TG', 'GC': 'AA', 'GG': 'CT', 'GT': 'GT', 'TA': 'CC', 'TC': 'AT', 'TG': 'GT', 'TT': 'GA'},
'G': {'AA': 'GC', 'AC': 'CA', 'AG': 'TG', 'AT': 'AT', 'CA': 'TT', 'CC': 'AG', 'CG': 'CC', 'CT': 'TA',
'GA': 'AG', 'GC': 'GC', 'GG': 'GA', 'GT': 'CC', 'TA': 'TA', 'TC': 'TT', 'TG': 'AT', 'TT': 'GG'},
'T': {'AA': 'CT', 'AC': 'GT', 'AG': 'AA', 'AT': 'TG', 'CA': 'CA', 'CC': 'AC', 'CG': 'GG', 'CT': 'CT',
'GA': 'AC', 'GC': 'CG', 'GG': 'TC', 'GT': 'AA', 'TA': 'GT', 'TC': 'GA', 'TG': 'CG', 'TT':'TC'}}
s_box_s7 = {
'A': {'AA': 'CA', 'AC': 'TC', 'AG': 'GT', 'AT': 'AA', 'CA': 'AG', 'CC': 'GT', 'CG': 'TG', 'CT': 'CT',
'GA': 'TT', 'GC': 'CA', 'GG': 'AA', 'GT': 'GC', 'TA': 'GA', 'TC': 'AC', 'TG': 'TC', 'TT': 'GG'},
'C': {'AA': 'AT', 'AC': 'TG', 'AG': 'TA', 'AT': 'AT', 'CA': 'GC', 'CC': 'CC', 'CG': 'CT', 'CT': 'TA',
'GA': 'CC', 'GC': 'AG', 'GG': 'GG', 'GT': 'TT', 'TA': 'CG', 'TC': 'GA', 'TG': 'AC', 'TT': 'CG'},
'G': {'AA': 'AC', 'AC': 'CG', 'AG': 'CA', 'AT': 'GT', 'CA': 'GT', 'CC': 'TC', 'CG': 'TC', 'CT': 'GA',
'GA': 'TA', 'GC': 'AC', 'GG': 'AT', 'GT': 'CA', 'TA': 'CT', 'TC': 'GG', 'TG': 'TG', 'TT': 'CT'},
'T': {'AA': 'GG', 'AC': 'GC', 'AG': 'TT', 'AT': 'CC', 'CA': 'CG', 'CC': 'AA', 'CG': 'GA', 'CT': 'TT',
'GA': 'AA', 'GC': 'TG', 'GG': 'CC', 'GT': 'AG', 'TA': 'GC', 'TC': 'AT', 'TG': 'AG', 'TT':'TA'}}
s_box_s8 = {
'A': {'AA': 'TC', 'AC': 'AC', 'AG': 'AG', 'AT': 'TT', 'CA': 'GA', 'CC': 'TC', 'CG': 'CA', 'CT': 'GA',
'GA': 'CG', 'GC': 'GG', 'GG': 'TT', 'GT': 'AT', 'TA': 'GT', 'TC': 'CT', 'TG': 'AC', 'TT': 'CA'},
'C': {'AA': 'GG', 'AC': 'TA', 'AG': 'GC', 'AT': 'CC', 'CA': 'AT', 'CC': 'CG', 'CG': 'TG', 'CT': 'GT',
'GA': 'CC', 'GC': 'AA', 'GG': 'AA', 'GT': 'TG', 'TA': 'TA', 'TC': 'GC', 'TG': 'CT', 'TT': 'AG'},
'G': {'AA': 'CT', 'AC': 'AG', 'AG': 'GT', 'AT': 'AC', 'CA': 'CA', 'CC': 'TG', 'CG': 'AC', 'CT': 'CT',
'GA': 'GC', 'GC': 'CA', 'GG': 'TA', 'GT': 'GG', 'TA': 'TG', 'TC': 'GA', 'TG': 'AG', 'TT': 'TC'},
'T': {'AA': 'AA', 'AC': 'TT', 'AG': 'CG', 'AT': 'TA', 'CA': 'GG', 'CC': 'GC', 'CG': 'TC', 'CT': 'AA',
'GA': 'TT', 'GC': 'AT', 'GG': 'AT', 'GT': 'CC', 'TA': 'CC', 'TC': 'CG', 'TG': 'GA', 'TT':'GT'}}
def divide_input(input_str):
nucleotides = [input_str[i:i+3] for i in range(0, len(input_str), 3)]
return nucleotides
nucleotides = divide_input(xor_result)
print("Divided nucleotides:", nucleotides)
def get_sbox_output(s_box, input_str):
output = ""
for i in range(0, len(input_str), 3):
block = input_str[i:i+3]
row = block[0]
col = block[1:]
output += s_box[row][col]
return output
def apply_sbox_to_nucleotides(nucleotides, s_boxes):
output = ""
for i, nucleotide in enumerate(nucleotides, start=1):
s_box_index = (i - 1) % len(s_boxes) # Calculate the index of the corresponding s-box
s_box = s_boxes[s_box_index]
output += get_sbox_output(s_box, nucleotide)
return output
s_boxes = [s_box_s1, s_box_s2, s_box_s3, s_box_s4, s_box_s5, s_box_s6, s_box_s7, s_box_s8] # List of S-boxes
output = apply_sbox_to_nucleotides(nucleotides, s_boxes)
print("Result after applying S-boxes:", output)
def apply_pbox(input_str, pbox_indices):
output_p = ''
for index in pbox_indices:
output_p += input_str[index - 1] # Subtract 1 to convert from 1-based to 0-based index
return output_p
pbox_indices = [
16, 7, 20, 21,
29, 12, 28, 17,
1, 15, 23, 26,
5, 18, 31, 10,
2, 8, 24, 14,
32, 27, 3, 9,
19, 13, 30, 6,
22, 11, 4, 25
]
permutated_output = apply_pbox(output, pbox_indices)
print("Permutated Output:", permutated_output)
def xor_with_L0(permutated_output, L0):
result = ''
for i in range(len(permutated_output)):
result += dna_xor(permutated_output[i], L0[i])
return result
R1=xor_with_L0(permutated_output,L0)
L1=R0
print("R1:",xor_with_L0(permutated_output,L0))
print("L1:",R0)
#function for printing key from k2 to k16
def round_function(L_prev, R_prev, round_key):
expanded_R = expansion_function(R_prev)
xor_result = ''.join(dna_xor(n1, n2) for n1, n2 in zip(expanded_R, round_key))
nucleotides = divide_input(xor_result)
s_box_output = apply_sbox_to_nucleotides(nucleotides, [s_box_s1,s_box_s2,s_box_s3,s_box_s4,
s_box_s5, s_box_s6, s_box_s7, s_box_s8])
permuted_output = apply_pbox(s_box_output, pbox_indices)
R_new = xor_with_L0(permuted_output, L_prev)
L_new = R_prev
return L_new, R_new
# Start from round 2 and go up to round 16
for i in range(2, 17):
round_key = round_keys[i-1] # Round keys are zero-indexed in the list
L1, R1 = round_function(L1, R1, round_key)
print(f"Round {i}:")
print("L{} =".format(i), L1)
print("R{} =".format(i), R1)
#function for final permutation
final_output = R1 + L1
print("Final Output:", final_output)
def final_permutation(final_output):
final_perm = [40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25]
final_permutation_messages=[];
final_permutation_message = permute(final_output,final_perm)
final_permutation_messages.append(final_permutation_message)
return(final_permutation_message)
final_permutation_output=final_permutation(final_output)
print("After final_permutation_output:");
#final permutation output
print(final_permutation_output)
def dna_to_bin(final_permutation_output):
dna_binary_mapping= {
'A': '00',
'C': '01',
'G': '10',
'T': '11'
}
bin_seq = ''
for i in range(0, len(final_permutation_output), 1):
bin_seq += dna_binary_mapping[final_permutation_output[i:i+1]]
return bin_seq
message=dna_to_bin(final_permutation_output)
def bin_to_hex(bin_seq):
bin_to_hex_mapping = {
'0000':'0',
'0001':'1',
'0010':'2',
'0011':'3',
'0100':'4',
'0101':'5',
'0110':'6',
'0111':'7',
'1000':'8',
'1001':'9',
'1010':'A',
'1011':'B',
'1100':'C',
'1101':'D',
'1110':'E',
'1111':'F'
}
hex_seq = ''
for i in range(0, len(bin_seq), 4):
hex_seq += bin_to_hex_mapping[bin_seq[i:i+4]]
return hex_seq
main_message=bin_to_hex(message)
return main_message
#final output message
final_output_1=Encryption(hex_input_message,hex_input_key_1)
i_result=Decryption(final_output_1,hex_input_key_2)
final_output=Encryption(i_result,hex_input_key_3)
print(final_output)
#final output verification
final_output_verification=Decryption(final_output,hex_input_key_3)
i_result_verification=Encryption(final_output_verification,hex_input_key_2)
original_message=Decryption(i_result_verification,hex_input_key_1)
print(original_message)
def convert_to_string(ascii_values):
input_string = ""
i = 0
while i < len(ascii_values):
ascii_val = int(ascii_values[i:i+2])
if ascii_val == 0:
break
input_string += chr(ascii_val)
i += 2
return input_string
input_string = convert_to_string(original_message)
print("**************")
print("Original string:", input_string)
print("****************")
"""# New Section"""