为优化HTTPS性能,研究了TCP特性对TLS性能的影响.通过数学模型分析,指出了2种不同条件下,TLS Record Size选择对用户首数据响应延时(TTFB)、首页面响应延时(TTFP)、网络效益、吞吐率等参数指标的影响.大的TLS Record Size提高网络吞吐...为优化HTTPS性能,研究了TCP特性对TLS性能的影响.通过数学模型分析,指出了2种不同条件下,TLS Record Size选择对用户首数据响应延时(TTFB)、首页面响应延时(TTFP)、网络效益、吞吐率等参数指标的影响.大的TLS Record Size提高网络吞吐和利用率,但增加了用户首数据响应延时,适合需要高吞吐但响应延时不敏感的场景;小的TLS Record Size降低用户响应延时却降低了网络吞吐和利用率,适合对用户响应时间敏感的场景.展开更多
Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. A new...Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. A new code match scheme for WCDMA code tree management was proposed. The code match scheme is similar to the existing crowed-first scheme. When choosing a code for a user, the code match scheme only compares the one up layer of the allocated codes, unlike the crowed-first scheme which perhaps compares all up layers. So the operation of code match scheme is simple, and the average time delay is decreased by 5.1%. The simulation results also show that the code match strategy can decrease the average code blocking probability by 8.4%.展开更多
This paper describes a new specialized Reconfigurable Cryptographic for Block ciphersArchitecture(RCBA).Application-specific computation pipelines can be configured according to thecharacteristics of the block cipher ...This paper describes a new specialized Reconfigurable Cryptographic for Block ciphersArchitecture(RCBA).Application-specific computation pipelines can be configured according to thecharacteristics of the block cipher processing in RCBA,which delivers high performance for crypto-graphic applications.RCBA adopts a coarse-grained reconfigurable architecture that mixes the ap-propriate amount of static configurations with dynamic configurations.RCBA has been implementedbased on Altera’s FPGA,and representative algorithms of block cipher such as DES,Rijndael and RC6have been mapped on RCBA architecture successfully.System performance has been analyzed,andfrom the analysis it is demonstrated that the RCBA architecture can achieve more flexibility and ef-ficiency when compared with other implementations.展开更多
We design a practical and provablysecure block ciper over small domain and non-binary inputs,which is also can be considered as a pseudorandom permutation on N elements.Our work is based on a relation we found between...We design a practical and provablysecure block ciper over small domain and non-binary inputs,which is also can be considered as a pseudorandom permutation on N elements.Our work is based on a relation we found between the small domain ciper and the negative hypergeometric probability(NHG) distribution.We prove that our block ciper achieves ideal security,that is,it is indistinguishable from a random permutation even if the adversary had already observed N plaintext-cipertext pairs.In particular,we initiate an efficient and sufficiently precise sampling algorithm for negative hypergeometric distribution.展开更多
文摘为优化HTTPS性能,研究了TCP特性对TLS性能的影响.通过数学模型分析,指出了2种不同条件下,TLS Record Size选择对用户首数据响应延时(TTFB)、首页面响应延时(TTFP)、网络效益、吞吐率等参数指标的影响.大的TLS Record Size提高网络吞吐和利用率,但增加了用户首数据响应延时,适合需要高吞吐但响应延时不敏感的场景;小的TLS Record Size降低用户响应延时却降低了网络吞吐和利用率,适合对用户响应时间敏感的场景.
基金Project(60202005) supported by the National Natural Science Foundation of China
文摘Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. A new code match scheme for WCDMA code tree management was proposed. The code match scheme is similar to the existing crowed-first scheme. When choosing a code for a user, the code match scheme only compares the one up layer of the allocated codes, unlike the crowed-first scheme which perhaps compares all up layers. So the operation of code match scheme is simple, and the average time delay is decreased by 5.1%. The simulation results also show that the code match strategy can decrease the average code blocking probability by 8.4%.
文摘This paper describes a new specialized Reconfigurable Cryptographic for Block ciphersArchitecture(RCBA).Application-specific computation pipelines can be configured according to thecharacteristics of the block cipher processing in RCBA,which delivers high performance for crypto-graphic applications.RCBA adopts a coarse-grained reconfigurable architecture that mixes the ap-propriate amount of static configurations with dynamic configurations.RCBA has been implementedbased on Altera’s FPGA,and representative algorithms of block cipher such as DES,Rijndael and RC6have been mapped on RCBA architecture successfully.System performance has been analyzed,andfrom the analysis it is demonstrated that the RCBA architecture can achieve more flexibility and ef-ficiency when compared with other implementations.
基金National 973 Fundamental Basic Research Program under grant No.2014CB340600 and by the National Natural Science Foundations of China
文摘We design a practical and provablysecure block ciper over small domain and non-binary inputs,which is also can be considered as a pseudorandom permutation on N elements.Our work is based on a relation we found between the small domain ciper and the negative hypergeometric probability(NHG) distribution.We prove that our block ciper achieves ideal security,that is,it is indistinguishable from a random permutation even if the adversary had already observed N plaintext-cipertext pairs.In particular,we initiate an efficient and sufficiently precise sampling algorithm for negative hypergeometric distribution.
