带延迟的分组密码算法密钥结合模式设计
A Key Delay Design on Block Cipher Algorithm
罗岚 瞿泽辉 周世杰 张凤荔 秦志光 魏正耀
提出了一种分组密码算法的延迟结合模式,进行了基于信息论原则的安全性证明,并对加入延迟后的密钥执行效率进行了评估.对于算法公开的分组密码,使用密钥延迟技术加强密码体制本身的强度,弱化种子密钥通过互联网公开分发造成的信息泄漏,特别可以有效阻止中间人唯密文进行的算法还原攻击.[著者文摘]
A key delay design on block cipher is proposed and is demonstrated based on provable security with information theory. Furthermore, we evaluate the result of key delay module. For the published block cipher, the key delay technology can enforce the cryptography system and decrease the information leak from key distribution through internet. Especially, this model can prevent the only cipher-text attack by middle attack.[著者文摘]
经典密码通信与量子密码通信的现状及发展趋势
Present status and development trends of the classical security communication and quantum cryptography
李同山 王善斌
对现有3种经典保密通信体系，即对称密钥体系、非对称密钥体系、Vernam密钥体系的现状和发展趋势进行了分析，指出了经典保密通信的局限性，重点阐述了绝对安全的量子密码通信的现状和发展趋势．[著者文摘]
Cryptographic technique is the core of information security technology. The three cryptosystems （symmetry, no-symmetry and vernam） and quantum cryptography＇s theory and recent technology were introduced. Limitation of the classic cryptography communication was analyzed, and security of the quantum cryptography was given in this paper.[著者文摘]
实际量子密钥分配扩展BB84协议窃听下的安全性分析
Practical Security Problem of Six States QKD Protocol
陈志新[1] 唐志列[1] 廖常俊[2] 刘颂豪[2]
考虑强衰减激光脉冲技术实现的准单光子源和量子信道损耗以及窃听者Eve窃听能力有限等实际情况，提出了一种窃听装置；同时对扩展BB84协议的各种窃听做了全面分析，计算得出发送者Alice／窃听者Eve所获得的交互信息量和发送者Alice／接收者Bob所能容忍的误码率上限，以此作为检测量子信道安全性的标准，同时得出Breidbart基／分柬攻击相结合的方法是比截取／重发更为有效的窃听方案．[著者文摘]
It is used attenuated laser pulses as the signal source rather than single photons in practical QKD system. The channels is used to transmit are lossy. Eve＇s eavesdropping ability is limited. On the basis of above three points, a eavesdropping device is presented. Meanwhile, the study is analyzed the calculation of the effective average Alice/Eve mutual information and Alice/Bob error fate＇s upper limit in six states QKD protocol. It shows that Breidbart eavesdropping/beamsplitter is the more effective one compared with Breidbart eavesdropping （B/B strategy）.[著者文摘]
RSA公钥密码系统算法的研究
戚勇 叶哲江 刘晓杰
在当今社会中，计算机网络通信已广泛应用到社会的各个领域，利用计算机网络进行商务活动时，其信息安全和信息的真实性极其重要。本文对计算机密码体制中非对称密码体制－RSA公开密钥密码体制进行了理论研究和阐述，并分析了其安全性。[著者文摘]
穷举法破解EXCEL、WORD文档密码
Approach to Deciphering the Cipher of Excel files ＆ word files in Chain-example
伍文运
本文讨论了如何使用VB编程，通过穷举法解除EXCEL文档和WORD文档的密码。并在破解过程中加入了中断，以方便用户随时中断破解过程。[著者文摘]
This paper claims how to apply VB program in Chain-examples to decipher of Excel files ,Word files.In the process of deciphering,it involves a termination, set for users to break Off the process at anytime if necessary.[著者文摘]
简便高效的希尔密码
亓传伟
希尔密码是一种较为常用的古典密码，具有相同的明文加密成不同的密文的特点，因此较移位密码、仿射密码等更为安全实用。本算法可简便高效地实现所有ASCII字符的希尔加密和解密，其中求逆矩阵的算法简洁实用。[著者文摘]
基于PIC的智能防盗型密码输入器设计
Design of password security input set of PIC-based intelligent cipher burglarproof
郑小真[1] 王艳[1] 邱放[2]
针对现实生活中人们输入重要密码时因被窥视而发生密码被盗现象,本文以输入按键和数码随机动态显示的形式,给出了一个智能型密码输入器的设计实现方法。利用伪随机数发生器原理,以微控制器PIC16F877为核心,配合按键和数码显示实现随机数的产生,对0-9十个数码位置的随机排列,并实现输入和显示相一致的效果。[著者文摘]
Due to the phenomenon of important passwords stolen when people input their passwords,thin paper discussed intelligent design method by pressing the buttons with the digital keys in dynamic random display.By use of principle of pseudo-random number generator,based on PIC16F877 Micro-controller,with buttons and digital display of random numbers generated from 0 - 9 in random order,get the consistent results of input and display.[著者文摘]
USB密码钥匙漏洞分析及防御策略的研究
Analysis of USB Key＇s Vulnerability and Research of Defense Strategy
张轶辉 王昭顺
随着我国网络银行业务的不断普及,网络上的金融犯罪也日益猖獗。因此,以PKI系统为基础的安全身份认证体系也在逐步得到广泛的关注。PKI系统的一个关键安全因素是私钥的保密,但用于存储证书和私钥的USB密码钥匙仍然存在着安全漏洞,使得系统很可能成为木马攻击的对象。首先分析了基于USB密码钥匙的PKI系统的工作原理及其存在的安全漏洞,其次针对这些漏洞提出切实可行的防御策略。[著者文摘]
ecently, along with the development of e-Bank business, more and more financial crime arises. So the security Identity authentication system based on PKI is becoming wide attention. The key of PKI system is security of private key. While the USB Key used to store certification and private key still has vulnerabilities in security, which makes the system tend to be attacked by Troy horse. This paper first analyzes the principle of USB Key base PKI system and its security vulnerability, and then provides some efficient defense strategies against the attacks.[著者文摘]
电子商务中混沌密码算法的研究
Research of Cipher Based on Chaos in Electronic Business
赵耿[1] 李杨[1] 方锦清[2]
主要综述国内外在混沌序列密码和单向Hash函数及对称分组密码和公钥分组密码的一些研究进展，并各举1～2例予以说明，同时比较性地分析了混沌密码算法与常规密码算法的异同，提出了目前存在的问题和可能的解决方法．[著者文摘]
Some research progresses of sequence ciphers, Hash functions, symmetrical block ciphers and public key ciphers all which are based on chaos are summarized. One or two examples are separately given to explain each of them. The similarities and differences between chaos cipher and conventional cipher are analyzed comparatively. Lastly ,immediate problems occurred and methods for solving these problems are proposed.[著者文摘]