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Rsa key example4/6/2024 Run the above code example: obtained digital signature is an integer in the range of the RSA key length [0. Signature = pow(hash, keyPair.d, keyPair.n) Hash = int.from_bytes(sha512(msg).digest(), byteorder= 'big') Msg = b'A message for signing' from hashlib import sha512 In Python we have modular exponentiation as built in function pow(x, y, n): # RSA sign the message It will fit in the current RSA key size (1024). Calculate its hash and raise the hash to the power d modulo n (encrypt the hash by the private key). Next, generate a 1024-bit RSA key-pair: from Crypto.PublicKey import RSA After the keys are generated, we shall compute RSA digital signatures and verify signatures by a simple modular exponentiation (by encrypting and decrypting the message hash). We shall use the pycryptodome package in Python to generate RSA keys. Let's demonstrate in practice the RSA sign / verify algorithm.
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