We propose a protocol for converting the encryption function of a ciphertext into another encryption function while keeping the corresponding message secret. The proposed protocol allows conversions of the El Gamal and Paillier cryptosystems and has the potential to design an efficient multiparty protocol intended for circuits consisting of arithmetic and logical operations. We clarify the condition of circuits such that the multiparty protocol based on the proposed protocol provides better performance than previous approaches. In addition, we introduce some privacy-preserving statistical computations as an effective application of the proposed protocol.
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机译：我们提出了一种协议，用于将密文的加密功能转换为另一个加密功能，同时保持相应的消息机密性。所提出的协议允许转换 El Gamal 和 Paillier 密码系统，并有可能设计一种高效的多方协议，用于由算术和逻辑运算组成的电路。我们阐明了电路的条件，使得基于所提出的协议的多方协议提供了比以前的方法更好的性能。此外，我们还引入了一些保护隐私的统计计算，作为所提出的协议的有效应用。
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