Carbon dots(CDs)-based composites have shown impressive performance in fields of information encryption and sensing,however,a great challenge is to simultaneously implement multi-mode luminescence and room-temperature...Carbon dots(CDs)-based composites have shown impressive performance in fields of information encryption and sensing,however,a great challenge is to simultaneously implement multi-mode luminescence and room-temperature phosphorescence(RTP)detection in single system due to the formidable synthesis.Herein,a multifunctional composite of Eu&CDs@p RHO has been designed by co-assembly strategy and prepared via a facile calcination and impregnation treatment.Eu&CDs@p RHO exhibits intense fluorescence(FL)and RTP coming from two individual luminous centers,Eu3+in the free pores and CDs in the interrupted structure of RHO zeolite.Unique four-mode color outputs including pink(Eu^(3+),ex.254 nm),light violet(CDs,ex.365 nm),blue(CDs,254 nm off),and green(CDs,365 nm off)could be realized,on the basis of it,a preliminary application of advanced information encoding has been demonstrated.Given the free pores of matrix and stable RTP in water of confined CDs,a visual RTP detection of Fe^(3+)ions is achieved with the detection limit as low as 9.8μmol/L.This work has opened up a new perspective for the strategic amalgamation of luminous vips with porous zeolite to construct the advanced functional materials.展开更多
随着信息技术在自然资源数字化场景领域的广泛应用,信息安全的重要性日益凸显。聚焦商用密码技术在自然资源数字化场景中的应用实践,深入剖析其关键作用与现实意义。通过调研分析、技术研究及实地验证等方法,详细阐述了透明加解密、软...随着信息技术在自然资源数字化场景领域的广泛应用,信息安全的重要性日益凸显。聚焦商用密码技术在自然资源数字化场景中的应用实践,深入剖析其关键作用与现实意义。通过调研分析、技术研究及实地验证等方法,详细阐述了透明加解密、软件开发工具包(Software Development Kit,SDK)集成等关键商用密码技术在自然资源数字化场景中的实践应用。研究表明,SM2、SM3、SM4、SM9等算法,以及数据库透明加密、安全认证网关等技术在保障用户身份认证、数据存储与传输安全等方面成效显著,有效提升了自然资源数字化场景统一服务平台的安全性与合规性,为商用密码技术在自然资源数字化应用场景中的深入应用提供了系统与实践经验,有望推动该领域信息安全水平的进一步提升。展开更多
Security of databases has always been a hot topic in the field of information security.Privacy protection can be realized by encrypting data,while data copyright can be protected by using digital watermarking technolo...Security of databases has always been a hot topic in the field of information security.Privacy protection can be realized by encrypting data,while data copyright can be protected by using digital watermarking technology.By combining these two technologies,a database’s copyright and privacy problems in the cloud can be effectively solved.Based on order-preserving encryption scheme(OPES),circular histogram and digital watermarking technology,this paper proposes a new robust watermarking scheme for protection of databases in the encrypted domain.Firstly,the OPES is used to encrypt data to avoid exposing the data in the cloud.Then,the encrypted data are grouped and modified by the use of a circular histogram for embedding a digital watermark.The common data query operations in database are available for the encrypted watermarking database.In receivers,the digital watermark and the original data can be restored through a secret key and a key table.Experimental results have shown that the proposed algorithm is robust against common database attacks in the encrypted domain.展开更多
基金supported by the National Natural Science Foundation of China(No.22288101)the 111 Project(No.B17020)。
文摘Carbon dots(CDs)-based composites have shown impressive performance in fields of information encryption and sensing,however,a great challenge is to simultaneously implement multi-mode luminescence and room-temperature phosphorescence(RTP)detection in single system due to the formidable synthesis.Herein,a multifunctional composite of Eu&CDs@p RHO has been designed by co-assembly strategy and prepared via a facile calcination and impregnation treatment.Eu&CDs@p RHO exhibits intense fluorescence(FL)and RTP coming from two individual luminous centers,Eu3+in the free pores and CDs in the interrupted structure of RHO zeolite.Unique four-mode color outputs including pink(Eu^(3+),ex.254 nm),light violet(CDs,ex.365 nm),blue(CDs,254 nm off),and green(CDs,365 nm off)could be realized,on the basis of it,a preliminary application of advanced information encoding has been demonstrated.Given the free pores of matrix and stable RTP in water of confined CDs,a visual RTP detection of Fe^(3+)ions is achieved with the detection limit as low as 9.8μmol/L.This work has opened up a new perspective for the strategic amalgamation of luminous vips with porous zeolite to construct the advanced functional materials.
文摘随着信息技术在自然资源数字化场景领域的广泛应用,信息安全的重要性日益凸显。聚焦商用密码技术在自然资源数字化场景中的应用实践,深入剖析其关键作用与现实意义。通过调研分析、技术研究及实地验证等方法,详细阐述了透明加解密、软件开发工具包(Software Development Kit,SDK)集成等关键商用密码技术在自然资源数字化场景中的实践应用。研究表明,SM2、SM3、SM4、SM9等算法,以及数据库透明加密、安全认证网关等技术在保障用户身份认证、数据存储与传输安全等方面成效显著,有效提升了自然资源数字化场景统一服务平台的安全性与合规性,为商用密码技术在自然资源数字化应用场景中的深入应用提供了系统与实践经验,有望推动该领域信息安全水平的进一步提升。
基金This work was supported by the National Natural Science Foundation of China(Grant No.61772234)the Special Funds for the Cultivation of Guangdong College Students’Scientific and Technological Innovation(pdjh2020a0060).
文摘Security of databases has always been a hot topic in the field of information security.Privacy protection can be realized by encrypting data,while data copyright can be protected by using digital watermarking technology.By combining these two technologies,a database’s copyright and privacy problems in the cloud can be effectively solved.Based on order-preserving encryption scheme(OPES),circular histogram and digital watermarking technology,this paper proposes a new robust watermarking scheme for protection of databases in the encrypted domain.Firstly,the OPES is used to encrypt data to avoid exposing the data in the cloud.Then,the encrypted data are grouped and modified by the use of a circular histogram for embedding a digital watermark.The common data query operations in database are available for the encrypted watermarking database.In receivers,the digital watermark and the original data can be restored through a secret key and a key table.Experimental results have shown that the proposed algorithm is robust against common database attacks in the encrypted domain.
