检索结果-南通市图书馆

Nondegenerative ML-sequences over ring Z/(2~e)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese science Bulletin 1999年第17期44卷 1557-1561页

作者： YANG Junhui and ZHAI Qibininstitute of software , chinese academy of sciences , beijing 100080, china state key laboratory of information security , beijing 100080, china chinese Acad Sci Inst Software Beijing 100080 Peoples R China state key Lab Informat Secur Beijing 100080 Peoples R China

The so-called quasi-period of an ML-sequence has been introduced. It is noted that an ML-sequence may degenerate in the sense that it has the quasi-period shorter than its period, and the problem of constructing the n... 详细信息

关键词： nondegenerate ML-sequence quasi-period.

On constant-round zero-knowledge proofs of knowledge for NP-relations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

science china(information sciences) 2010年第4期53卷 788-799页

作者： LI HongDa1*, XU HaiXia1, LI Bao1 & FENG DengGuo2 1state key laboratory of information security, Graduate University of chinese academy of sciences, beijing 100049, china 2state key laboratory of information security, institute of software of chinese academy of sciences, beijing 100080, china state key laboratory of information security Graduate University of Chinese Academy of Sciences Beijing China state key laboratory of information security Institute of Software of Chinese Academy of Sciences Beijing China

This paper considers the existence of constant-round zero-knowledge proofs of knowledge for NP under standard assumptions. By introducing a new interactive proof model, we construct a 3-round zero-knowledge proof of knowledge system for the NP-relation under the assumption that factoring is intractable. Our construction not only shows the existence of constant-round zero-knowledge proofs of knowledge, but also gives a positive answer to the open problem of the existence of 3-round zero-knowledge proofs for NP.

关键词： zero-knowledge proof proof of knowledge constant-round NP-relation

Improved multi-pass fast correlation attacks with applications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(information sciences) 2011年第8期54卷 1635-1644页

作者： ZHANG Bin & FENG DengGuo state key laboratory of information security,institute of software,chinese academy of sciences,beijing 100190,china state key laboratory of information security Institute of Software Chinese Academy of Sciences Beijing China

In this paper we propose two new algorithms for multi-pass fast correlation attacks on stream *** first algorithm aims at fast symbol-wise decoding in the circumstances that the noise is not very high and we have little resource for *** second algorithm deals with the practical decoding problem in the high noise and limited keystream *** new algorithms are applicable to arbitrary form LFSR and compare favorably to the previously known algorithms in the scenarios under *** applications,we demonstrate new key recovery attacks on one-level Bluetooth E0 and LILI-128,*** 2 37 -bit keystream and 2 28-byte memory,our attack against one-level E0 needs 2 35.1 *** 2 24-bit keystream and 2 24.5 -byte memory,our attack on LILI-128 has time complexity 2 70.6 operations.

关键词： stream cipher fast correlation attacks linear feedback shift register (LFSR) Bluetooth E0 LILI-128

security model and modular design of fair authentication key exchange protocols

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(information sciences) 2010年第2期53卷 278-287页

作者： FENG DengGuo & CHEN WeiDong state key laboratory of information security, institute of software, chinese academy of sciences, beijing 100190, china state key laboratory of information security Institute of Software Chinese Academy of Sciences Beijing China

It is traditionally assumed that the legal two parties in authentication key exchange (AKE) communications are both credible. However, in more and more network applications nowadays, it is often required that such protocols be run under the circumstances where ones do not trust in each other. Therefore, in this paper we propose the idea of fair authentication key exchange (FAKE), which has not only the basic properties of AKE protocols, but also some new properties: the "session proof" embedded in the input of protocols by the customer; and if not revealed, the protocols have the deniability, otherwise the transcript of protocol is binding for the identifications. Such a method is capable of solving the contradiction between protecting privacy and the dissension on network service. Then the security model of FAKE protocols is formulated systematically and a flaw of the security model of current signature schemes proposed by Kudla is also corrected. Finally, a kind of FAKE protocol based on current signature schemes is designed and the mBJM-AK security, conditional deniability and fairness of FAKE protocols are proved in the random oracle model.

关键词： authentication key exchange protocols deniability fairness concurrent signature provable security

Round-optimal zero-knowledge proofs of knowledge for NP

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(information sciences) 2012年第11期55卷 2473-2484页

作者： LI HongDa1,FENG DengGuo2,LI Bao1 & XUE HaiXia1 1state key Lab of information security,Graduate University of chinese academy of sciences,beijing 100049,china 2state key Lab of information security,institute of software of chinese academy of sciences,beijing 100080,china state key Lab of information security Graduate University of Chinese Academy of Sciences Beijing China state key Lab of information security Institute of software of Chinese Academy of Sciences Beijing China

It is well known that all the known black-box zero-knowledge proofs of knowledge for NP are *** there exit constant-round black-box zero-knowledge proofs of knowledge for all NP languages under certain standard assumptions is an open *** paper focuses on the problem and gives a positive answer by presenting two constructions of constant-round(black-box) zero-knowledge proofs of knowledge for the HC(hamiltonian cycle) *** the recent result of Katz,our second construction which relies on the existence of claw-free functions has optimal round complexity(5-round) assuming the polynomial hierarchy does not collapse.

关键词： zero-knowledge proofs proofs of knowledge black-box simulation constant-round

A two-round honest-verifier zero-knowledge protocol

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(information sciences) 2010年第5期53卷 954-963页

作者： LIU HanWu 1,2 & LIN DongDai 1 1 The state key laboratory of information security, institute of software, chinese academy of sciences, beijing 100190, china 2 Graduate University of the chinese academy of sciences, beijing 100049, china The state key laboratory of information security Institute of Software Chinese Academy of Sciences Beijing China Graduate University of the chinese academy of sciences Beijing China

Since the concept of zero-knowledge protocols was introduced, it has attracted a lot of attention and in turn showed significant effect on the development of cryptography, complexity theory and other areas. The round complexity of a zero-knowledge protocol is a very important efficiency consideration, and it is required to be as small as possible. Generally, it is desirable to have zero-knowledge protocols with constant numbers of rounds. Goldreich and Oren proved that only languages in BPP have one-round and two-round zero-knowledge protocols. Moreover, they also showed that only languages in BPP have one-round honest-verifier zero-knowledge protocols. The notion of honest-verifier zero-knowledge protocols is highly non-trivial and fascinating itself, and has many other uses. Thus, the problem as to whether there exist two-round honest-verifier zero-knowledge protocols becomes an important open problem. In this paper, we introduce a new simulation technique and present a two-round honest-verifier zero-knowledge protocol for any language in N P under a standard complexity assumption based on this technique.

关键词： proof system argument system zero-knowledge witness indistinguishability black-box one-way permutation commitment scheme zap

CMQV+:An authenticated key exchange protocol from CMQV

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(information sciences) 2012年第7期55卷 1666-1674页

作者： LI Hui 1,2 & WU ChuanKun 1 1 state key laboratory of information security,institute of software,chinese academy of sciences,beijing 100190,china 2 Graduate University of chinese academy of sciences,beijing 100049,china state key laboratory of information security Institute of Software Chinese Academy of Sciences Beijing China Graduate University of chinese academy of sciences Beijing China

Ustaoglu presents a secure and efficient key exchange protocol named CMQV,based on the design rationales of HMQV and *** with the latter two protocols,on one hand,CMQV achieves high performance of HMQV,and on the other,it is proven secure in eCK model as NAXOS ***,CMQV enjoys the security proof under gap Diffie-Hellman assumption as indicated by its *** this paper,we propose a variant of CMQV,called CMQV+,which is proven secure under a weaker assumption (*** Diffie-Hellman assumption) in eCK model with random oracles while maintaining the high-performance feature of CMQV as much as possible.

关键词： key exchange eCK model trapdoor-test technique provable security CDH assumption

Privilege Flow Oriented Intrusion Detection Based on Hidden Semi-MarkovModel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural sciences 2005年第1期10卷 137-141页

作者： ZHONG An-ming 1, JIA Chun-fu 1,21.College of information Technology and sciences, Nankai University, Tianjin 300071,china 2.state key laboratory of information security, institute of software of chinese academy of science, beijing 100039,china College of information Technology and sciences Nankai University Tianjin China state key laboratory of information security Institute of Software of Chinese Academy of Science Beijing China

A privilege flow oriented intrusion detection method based on HSMM (Hidden semi-Markov Model) is discussed. The privilege flow model and HSMM are incorporated in the implementation of an anomaly detection IDS (Intrusion Detection System). Using the dataset of DARPA 1998, our experiment results reveal good detection performance and acceptable computation cost.

关键词： key words intrusion detection privilege flow model HSMM

维普期刊数据库

Black-box testing based on colorful taint analysis

在线全文

学校读者我要写书评

暂无评论

science china(information sciences) 2012年第1期55卷 171-183页

作者： CHEN Kai1,2,3,FENG DengGuo1,SU PuRui1&ZHANG YingJun1,2,3 1state key laboratory of information security,institute of software,chinese academy of science,beijing 100190,china 2state key laboratory of information security,Graduate University of chinese academy of sciences,beijing 100049,china 3National Engineering Research Center of information security,beijing 100190,china state key laboratory of information security Institute of Software Chinese Academy of Science Beijing China state key laboratory of information security Graduate University of Chinese Academy of Sciences Beijing China National Engineering Research Center of information security Beijing China

software vulnerability detection is one of the most important methods for guaranteeing software *** main classes of methods can detect vulnerabilities in binary files:white-box testing and black-box *** former needs to construct and solve path constraints to detect *** has two main drawbacks:path exploding and complexity of *** latter often aimlessly exhausts various inputs to test binary *** paper combines both testing methods to detect vulnerabilities in binary *** analyzing the input elements that aect check condition corresponding to a certain check point,we can generate one class of inputs that get to the check point to increase fuzzing *** analyzing the relationship between guard conditions and check condition,the redundant check points are *** taint analysis method(CTAM)is proposed to compute guard conditions,which is more ecient than traditional taint analysis method(TTAM).We implemented a prototype and made several experiments on *** results showed that our method could increase the eciency of black-box testing.

关键词： software testing vulnerability detection dynamic testing black-box testing colorful taint analysis