User profile matching can establish social relationships between different users in the social network.If the user profile is matched in plaintext,the user's privacy might face a security challenge.Although there ...User profile matching can establish social relationships between different users in the social network.If the user profile is matched in plaintext,the user's privacy might face a security challenge.Although there exist some schemes realizing privacypreserving user profile matching,the resource-limited users or social service providers in these schemes need to take higher computational complexity to ensure the privacy or matching of the data.To overcome the problems,a novel privacy-preserving user profile matching protocol in social networks is proposed by using t-out-of n servers and the bloom filter technique,in which the computational complexity of a user is reduced by applying the Chinese Remainder Theorem,the matching users can be found with the help of any t matching servers,and the privacy of the user profile is not compromised.Furthermore,if at most t-1 servers are allowed to collude,our scheme can still fulfill user profile privacy and user query privacy.Finally,the performance of the proposed scheme is compared with the other two schemes,and the results show that our scheme is superior to them.展开更多
To extensively deploy quantum key distribution（QKD） systems, copropagating with classical channels on the same fiber using wavelength division multiplexing（WDM） technology becomes a critical issue. We propose a us...To extensively deploy quantum key distribution（QKD） systems, copropagating with classical channels on the same fiber using wavelength division multiplexing（WDM） technology becomes a critical issue. We propose a user-based channel-interleaving WDM scheme with unequal frequency spacing（UFS-i WDM） to reduce the impairment on the quantum channels induced by four-wave mixing（FWM）, and theoretically analyze its impact on quantum bit error rate（QBER）. Numerical simulation results show that a UFS-i WDM can significantly reduce the FWM noise and improve QBER compared with the corresponding WDM scheme with equal frequency spacing（EFS）, especially in the case of nonzero dispersion shifted fiber.展开更多
基金supported in part by the Natural Science Foundation of Beijing(no.4212019,M22002)the National Natural Science Foundation of China(no.62172005)+1 种基金the Open Research Fund of Key Laboratory of Cryptography of Zhejiang Province(No.ZCL21014)the Foundation of Guizhou Provincial Key Laboratory of Public Big Data(no.2019BDKF JJ012)。
文摘User profile matching can establish social relationships between different users in the social network.If the user profile is matched in plaintext,the user's privacy might face a security challenge.Although there exist some schemes realizing privacypreserving user profile matching,the resource-limited users or social service providers in these schemes need to take higher computational complexity to ensure the privacy or matching of the data.To overcome the problems,a novel privacy-preserving user profile matching protocol in social networks is proposed by using t-out-of n servers and the bloom filter technique,in which the computational complexity of a user is reduced by applying the Chinese Remainder Theorem,the matching users can be found with the help of any t matching servers,and the privacy of the user profile is not compromised.Furthermore,if at most t-1 servers are allowed to collude,our scheme can still fulfill user profile privacy and user query privacy.Finally,the performance of the proposed scheme is compared with the other two schemes,and the results show that our scheme is superior to them.
基金supported by the National Natural Science Foundation of China under Grant No.61331008
文摘To extensively deploy quantum key distribution（QKD） systems, copropagating with classical channels on the same fiber using wavelength division multiplexing（WDM） technology becomes a critical issue. We propose a user-based channel-interleaving WDM scheme with unequal frequency spacing（UFS-i WDM） to reduce the impairment on the quantum channels induced by four-wave mixing（FWM）, and theoretically analyze its impact on quantum bit error rate（QBER）. Numerical simulation results show that a UFS-i WDM can significantly reduce the FWM noise and improve QBER compared with the corresponding WDM scheme with equal frequency spacing（EFS）, especially in the case of nonzero dispersion shifted fiber.
