How do I encrypt an RSA public key using a DES algorithm which uses a Diffie-Hellman key

Python
1

I am very new to python and for my assignment i have been asked to “Encrypt a public key using the DES/AES algorithm. The secret DES/AES key (Ks) used is from step 2.” Step 2 asks me to negotiate a shared key (Ks) using Diffie-Hellman protocol with p = 23 and g =17. How is this supposed to be done? I’ve looked through countless youtube videos and I have no idea how the shared key can be used in the code. PLS HELP…

2

What have you tried so far? It’s easier to help if you show us what code you’ve tried.

3

step 2:

(public_key, private_key) = rsa.newkeys(2048)

p = 23
g = 17

alice_key = 8

a = (g**alice_key) % p

conn = socket.socket()
conn.connect((socket.gethostname(), 12345))
bob_key = conn.recv(1024).decode("utf-8")
conn.send(str(a).encode('utf-8'))

final = (int(bob_key)**a) % p
print("shared key: " + str(final))
key = token_bytes(final)

the shared key was 16.

i have no idea how accurate the usage of the following code (taken from DES Encryption In Python - YouTub) is but it is the only one i’ve seen which allowed me to use the shared key in any capacity as key = token_bytes(final). i am getting alot of errors tho. but i reiterate i’m very new to python.

cipher = DES.new(key, DES.MODE_EAX)
nonce = cipher.nonce
ciphertext, tag = cipher.encrypt_and_digest(public_key.encode('ascii'))
4

Does your assignment require the use of the socket stuff? I don’t think I understand the parameters of your assignment.

5

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