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    The SecretBox class encrypts and decrypts messages using the given secret
    key.

    The ciphertexts generated by :class:`~nacl.secret.Secretbox` include a 16
    byte authenticator which is checked as part of the decryption. An invalid
    authenticator will cause the decrypt function to raise an exception. The
    authenticator is not a signature. Once you've decrypted the message you've
    demonstrated the ability to create arbitrary valid message, so messages you
    send are repudiable. For non-repudiable messages, sign them after
    encryption.

    :param key: The secret key used to encrypt and decrypt messages
    :param encoder: The encoder class used to decode the given key

    :cvar KEY_SIZE: The size that the key is required to be.
    :cvar NONCE_SIZE: The size that the nonce is required to be.
    :cvar MACBYTES: The size of the authentication MAC tag in bytes.
    :cvar MESSAGEBYTES_MAX: The maximum size of a message which can be
                            safely encrypted with a single key/nonce
                            pair.
    cC`sk|j|�}t|t�s0tjd��nt|�|jkr^tjd|j��n||_dS(Ns'SecretBox must be created from 32 bytess%The key must be exactly %s bytes long(	tdecodet
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        Encrypts the plaintext message using the given `nonce` (or generates
        one randomly if omitted) and returns the ciphertext encoded with the
        encoder.

        .. warning:: It is **VITALLY** important that the nonce is a nonce,
            i.e. it is a number used only once for any given key. If you fail
            to do this, you compromise the privacy of the messages encrypted.
            Give your nonces a different prefix, or have one side use an odd
            counter and one an even counter. Just make sure they are different.

        :param plaintext: [:class:`bytes`] The plaintext message to encrypt
        :param nonce: [:class:`bytes`] The nonce to use in the encryption
        :param encoder: The encoder to use to encode the ciphertext
        :rtype: [:class:`nacl.utils.EncryptedMessage`]
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        Decrypts the ciphertext using the `nonce` (explicitly, when passed as a
        parameter or implicitly, when omitted, as part of the ciphertext) and
        returns the plaintext message.

        :param ciphertext: [:class:`bytes`] The encrypted message to decrypt
        :param nonce: [:class:`bytes`] The nonce used when encrypting the
            ciphertext
        :param encoder: The encoder used to decode the ciphertext.
        :rtype: [:class:`bytes`]
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