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Encrypts and returns the message ``message`` with the secret ``key`` and
the nonce ``nonce``.
:param message: bytes
:param nonce: bytes
:param key: bytes
:rtype: bytes
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Decrypt and returns the encrypted message ``ciphertext`` with the secret
``key`` and the nonce ``nonce``.
:param ciphertext: bytes
:param nonce: bytes
:param key: bytes
:rtype: bytes
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