Efficiently protecting the privacy of multi-recipient emails is not as trivial as it seems. The approach proposed by S/MIME is to concatenate all ciphertexts. However, it suffers from poor scalability due to its linear computation and communication cost. In this paper, we propose a new practical and secure scheme, called multiplex encryption. By combining the ideas of identity-based mediated RSA and re-encryption mix network, our framework only requires constant computation and communication cost to encrypt a multi-recipient email.
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机译：有效保护多收件人电子邮件的隐私并不像看起来那么微不足道。 S / MIME提出的方法是连接所有密文。 然而，由于其线性计算和通信成本，它具有差的可扩展性。 在本文中，我们提出了一种新的实用和安全的方案，称为多路复用加密。 通过组合基于身份的介导的RSA和重新加密混合网络的想法，我们的框架仅需要恒定的计算和通信成本来加密多收件人电子邮件。
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