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Semiconductor Science and Information Devices 2021年第2期3卷 1-11页

作者： Shaun Mc Brearty william Farrelly Kevin Curran Institute of Technology SligoIreland Letterkenny Institute of Technology LetterkennyIreland Ulster University DerryUnited Kingdom

In the absence of specialized encryption hardware,cryptographic operationsmust be performed in main memory.As such,it is common place for cybercriminals to examine the content of main memory with a view to retrievinghigh-value data in plaintext form and/or the associated decryption key.Inthis paper,the author presents a number of simple methods for identifyingand extracting crypfographic keys from memory dumps of softwareapplications that utilize the *** Framework,as well as source-code level countermeasures to protect against same.Given the EXE file ofan application and a basic knowledge of the cryptographic libraries utilizedin the NET Framework,the author shows how to create a memory dumpof a running application and how to extract cryptographic keys from sameusing WinDBG-without any prior knowledgel of the cryptographic keyutilized.Whilst the proof-of-concept application utilized as part of thispaper uses an implementation of the DES cipher,it should be noted that thesteps shown can be utilized against all three generations of symmetric andasymmetric ciphers supported within the NET Framework.

关键词： cryptography Cryptanalysis Memory dump analysis Memory hygiene Key finding attack Secure coding .NET framework

A Blind Threshold Proxy Signature Scheme with Revoking Anonymity

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通讯和计算机（中英文版） 2005年第9期2卷 41-45页

作者： Xiaoming Wang Department of Computer Science Jinan University Guangzhou 510632 China

A blind threshold proxy signature scheme with revoking anonymity is proposed according to the benefit of the original signer and the proxy signer. In the proposed scheme, the actual threshold proxy signer is unidentified, but when we need the system authority, it can revoke these actual proxy signers anonymity. Therefore, the proposed scheme can indirectly supervise the proxy signers and prevent the abuse of signing capability. Furthermore, the proposed scheme can withstand the conspiracy attack and could revoke the proxy signer s proxy signing capability if the original signer needs.

关键词： cryptography Digital Signature Proxy Signature Threshold Proxy Signature

A Time Slices Information Concealed Cryptosystem Model

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A Time Slices Information Concealed Cryptosystem Model

Modified Harn Authentication Key Exchange Scheme

2007年国际电子商务、工程及科学领域的分布式计算和应...

作者： Zhichao Yan Qingping Guo Yifan Huang Department of Computer Science and Technology Wuhan University of Technology Wuhan Hubei 430063.P.R.China

This paper introduces a cryptosystem model that conceals the information of time slices between the password characters. See the time-gap generated through the keystroke as cryptical information, we encrypt and decrypt it as invisible plaintext after been processed. So, in this paper there are two sets of plaintext, two sets of ciphertext, two sets of keys, two sets of encryption algorithm and decryption algorithm. It seems that the user had two locks to make the data protected more secure. And in this paper the author makes a particular analysis in extracting the time slices.

关键词： cryptography Encryption Plaintext Time Slices Two Locks

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The Journal of China Universities of Posts and Telecommunications 2000年第1期7卷 75-77页

作者： LIZi-chen LIZhong-xian 等 InformationSecurityCenter BeijingUniversityofPostsandTelecommunicationsBeijing100876P.R.China Infor

Recently, Harn proposed one digital signature scheme for Diffie-Hellman key exchange system. In this paper, we point out at first that there is a weakness in Harn's system and then we propose two modified schemes to a... 详细信息

关键词： Digital signature Key exchange cryptography

Comparative Study of Different Cryptographic Algorithms

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Journal of Information Security 2020年第3期11卷 138-148页

作者： Baha Eldin Hamouda Hassan Hamouda Department of Information Technology Gulf Colleges Hafar Al-Batin KSA

With the increasing interconnection of computer networks and sophistication of cyber-attacks, cryptography is one way to make sure that confidentiality, authentication, integrity, availability, and identification of data user can be maintained as well as security and privacy of data provided to the user. Symmetric key cryptography is a part of the cryptographic technique which ensures high security and confidentiality of data transmitted through the communication channel using a common key for both encryption and decryption. In this paper I have analyzed comparative encryption algorithms in performance, three most useful algorithms: Data Encryption Standard (DES), Triple DES (3DES) also known as Triple Data Encryption Algorithm (TDEA), and Advanced Encryption Standard (AES). They have been analyzed on their ability to secure data, time taken to encrypt data and throughput the algorithm requires. The performance of different algorithms differs according to the inputs.

关键词： cryptography DES 3DES AES Encryption Decryption Ciphertext Plaintext

Design and Implementation of End to End Encrypted Short Message Service (SMS) Using Hybrid Cipher Algorithm

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Journal of Software Engineering and Applications 2020年第3期13卷 25-40页

作者： Emmanuel Nwabueze Ekwonwune Victor Chibunna Enyinnaya Department of Computer Science Imo State University Owerri Nigeria Department of Computer Science Abia State College of Health Sciences and Management Technology Aba Abia State Nigeria

The study on design and implementation of end to end encrypted Short Message Service (SMS) using hybrid cipher algorithm is motivated by high rate of insecurity of data observed during Short Message Service (SMS) on Mobile devices. SMS messages are one of the popular ways of communication. The aim therefore is to design a software for end to end encryption short message service (SMS) that can conceal message while on transit to another mobile device using Hybrid Cipher Algorithm on Android Operating System and implement it for security of mobile SMS. Hybrid encryption incorporates a combination of asymmetric and symmetric encryption to benefit from the strengths of each form of encryption. Various encryption algorithms have been discussed. Secondary sources were employed in gathering useful data. In this research work three methodologies are employed—Structured System Analysis Design Methodology (SSADM), Object Oriented Analysis Design Methodology (OOADM) and prototyping. With the help of the three cryptographic algorithms employed—Message digest 5 (MD5), Blowfish and Rivest-Shamir Adleman (RSA);integrity, confidentiality, authentication and security of messages were achieved. The messages encrypted by developed application are also resistant to brute force attack. The implementing programs were coded in Java.

关键词： Encryption Hybrid Security Integrity Authentication Vulnerability cryptography Short Message Service (SMS) Global System for Mobile Communication (GSM) Message Digest 5 (MD5) Blowfish and Rivest-Shamir Adleman (RSA)

GMW sequences over Galois rings and their linear complexities

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Frontiers of Electrical and Electronic Engineering in China 2009年第2期4卷 141-144页

作者： Nigang SUN Lei HU Department of Computer Science and Engineering East China University of Science and TechnologyShanghai 200237China State Key Laboratory of Information Security Graduate University of Chinese Academy of SciencesBeijing 100049China

A new family of GMW sequences over an arbitrary Galois ring was defined by using the trace functions and permutations.This generalizes the concept of GMW sequences over finite fields.Utilizing the Fourier representation,we derived an estimate of the linear complexities of this family of GMW sequences.And the result shows that such sequences have large linear complexities.

关键词： cryptography GMW sequence linear complexity Galois ring

Modified Harn Authentication Key Exchange Scheme

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The Journal of China Universities of Posts and Telecommunications 2000年第Z1期 75-77页

作者： LI Zi-chen, LI Zhong-xian, YANG Yi-xian (Information Security Center, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China)

Recently, Harn proposed one digital signature scheme for Diffie-Hellman key exchange system. In this paper, we point out at first that there is a weakness in Harn’s system and then we propose two modified schemes to ... 详细信息

关键词： Digital signature Key exchange cryptography

Security Framework for Distributed Database System

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Journal of Data Analysis and Information Processing 2019年第1期7卷 1-13页

作者： Allajabu Dafalla Khamis Saad Subair College of Computer and Information Science Faculty of Graduate Studies Alzaem Alazhari University Khartoum Sudan College of Computer Studies International University of Africa Khartoum Sudan

This research aims to study various Symmetrical Algorithms, while the main objective of this study is to find out a suitable algorithm for the encryption of any specific size of text file where the experiment of each algorithm is based on encryption of different sizes of the text files, which are in “10 KB to 5 MB”, and also to calculate the time duration that each algorithm takes to encrypt or to decrypt the particular size of each text file. There are many types of encryption algorithm, which can be used to encrypt the computerized information in different Organizations, whose all algorithms can encrypt and decrypt any size of text file, but the time duration of each Algorithm during the encryption or decryption process of specific file size is not fixed. Some of the algorithms are suitable for encryption of specific ranges of the file size, or some of algorithms are functional while encryption small size of files, and others algorithms are functional for encryption of big size of text files, based on the time duration disparity among symmetric algorithms during encryption of text files. In this study five symmetrical algorithms are merged in one program using classes and concept of inheritance in the form that if encryption is needed, the program will select the file and it checks the size of the text file. After this process the program automatically will select the suitable encryption algorithm to encrypt the specific text file according to the range of the file size. Knowing that the file size before or after encryption will not change or is stable, in this case of the decryption algorithm will apply the same process of encryption while decrypting files, the program of encryption and decryption code will write using visual Studio 2013. The result will be analyzed with R program (R software), the cipher text will appear in the format of UTF8 which means Unicode Transformation Format, “8” Means “8” bits to represent a character, the size format that will apply in the program will be in format of KB (kilo Byte

关键词： cryptography Encryption Decryption Time Duration AES DES 3DES Rijndael RC2