Data encryption standard (DES) algorithm implementation in Python.
- DES (Data Encryption Standard) is a block cipher that encrypts in blocks of 64 bits. For a 64-bit input block, a 64-bit output block is obtained.
- DES is a symmetric algorithm. That means the same key is used for encryption and decryption.
- The algorithm is a combination of two techniques. These are referred to as confusion and diffusion. The application of a simple combination of these techniques on a block is called a round. DES has 16 loops.
- More precisely, these two techniques are applied 16 times on a block of plain text.
print("--------------------------- 64bits message --------------------------")
text = "you are " # 64bits text
binary_text = get_binary_message(text)
cipher = des_encrypt.encrypt(binary_text)
print("Encrypted message of 'you are ': ", cipher)
decrypted_cipher = des_decrypt.encrypt(cipher)
print("Decrypted message in binary: ", decrypted_cipher)
print("Decrypted message: ", get_ascii_message(decrypted_cipher))
print("--------------------------- 3688bits message --------------------------")
text2 = ""
with open("text.txt", "r") as t:
text2 = t.read()
print(text2)
binary_text = get_binary_message(text2)
cipher = des_encrypt.text_encrypt(binary_text)
print("Encrypted message of 'text ': ", cipher)
decrypted_cipher = des_decrypt.text_encrypt(cipher)
print("Decrypted message in binary: ", decrypted_cipher)
print("Decrypted message: ", get_ascii_message(decrypted_cipher))- Output of the code above
