Highlights
Message b'secret message' has been signed using RSA-PSS using the following code snippet.
backend=default_backend()
private_key = rsa.generate_private_key(public_exponent=3,
key_size=512,backend=backend)
save_key(private_key, 'private_key.pem', b'yetanotherpassword')
message=b'secret message'
signature = private_key.sign(message,
padding.PSS(mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH),
hashes.SHA256()
)
Find out which of the private_key_x.pem files attached is the one from which the corresponding public key can be derived to verify the signature. The signature is as follows:
signature = b'\x1e\xde\xabn\x95\xf0\xbbv\xc37\xac=\x9eeM\xf0)\xc7 P\xb2\x8b)X\xac\xe9\x9b&\x83p\x80\x89\xbd%,Q=\xdd\xfd7\xa8j\x90\xa1\xd6\xe7\x1ef\xee\x85CLA\xb2u\xfc3\x1b5c/k\xf3\xf4'
Submit your code. The code should (a) load the pem key from the local directory using
public_key = load_key('private_key_x.pem').public_key()
where ‘private_key_x.pem’ should be replaced with the name of the correct pem file, and then (b) verify the signature.
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