With the development of electric vehicles, more and more electric vehicles have difficulties in parking and charging. One of the reasons is that the number of charging piles is difficult to support the energy supply of electric vehicles, and a large number of private charging piles have a long idle time, so the energy supply problem of electric vehicles can be solved by sharing charging piles. The shared charging pile scheme uses Paillier encryption scheme and improved scheme to effectively protect user data. The scheme has homomorphism of addition and subtraction, and can process information without decryption. However, considering that different users have different needs, the matching is carried out after calculating the needs put forward by users. This scheme can effectively protect users' privacy and provide matching mechanisms with different requirements, so that users can better match the appropriate charging piles. The final result shows that its efficiency is better than the original Paillier scheme, and it can also meet the security requirements.

翻译：随着电动汽车的发展，越来越多的电动汽车面临停车和充电困难。其原因之一在于充电桩数量难以支撑电动汽车的能源供给，而大量私人充电桩存在较长的闲置时间，因此通过共享充电桩可以解决电动汽车的能源供给问题。该共享充电桩方案采用Paillier加密方案及其改进版本，有效保护用户数据。该方案具有加法与减法的同态性，可在不解密的情况下处理信息。然而，考虑到不同用户具有不同需求，在计算用户提出的需求后进行匹配。本方案能够有效保护用户隐私，并提供满足不同需求的匹配机制，使用户能更好地匹配到合适的充电桩。最终结果表明，其效率优于原始Paillier方案，同时也能满足安全需求。