Analysis of El-Gamal with Diffie-Hellman Scheme using Hash-Function for Message Security (original) (raw)
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Chaudhai “An Approach for SMS Security using Authentication Functions
2016
Asymmetric algorithm like Diffie-Hellman can be used to encrypt the SMS message in M-commerce or mobile banking system. Password key exchange protocol based on Diffie-Hellman key exchange algorithm allows users to exchange a secret key that can be used in message encryption. The security of this protocol can be increased by using the MAC (message authentication code) or hash function with the encryption. These functions act as an error detecting code or checksum. This paper throws a light on the comparative analysis of both the authentication functions separately in password key exchange protocol. By analyzing some of the security issues viz. (i) brute force attach and (ii) cryptanalysis, it can be very well shown that the MAC function is more secure than hash.
An Approach for SMS Security using Authentication Functions
IJCA, Published by Foundation of Computer Science, New York, USA, 2012
Asymmetric algorithm like Diffie-Hellman can be used to encrypt the SMS message in M-commerce or mobile banking system. Password key exchange protocol based on Diffie-Hellman key exchange algorithm allows users to exchange a secret key that can be used in message encryption. The security of this protocol can be increased by using the MAC (message authentication code) or hash function with the encryption. These functions act as an error detecting code or checksum. This paper throws a light on the comparative analysis of both the authentication functions separately in password key exchange protocol. By analyzing some of the security issues viz. (i) brute force attach and (ii) cryptanalysis, it can be very well shown that the MAC function is more secure than hash.
An Extended Approach for SMS Security using Authentication Functions
2012
Nowadays, security of SMS is a crucial aspect because it plays an important role in value added services and mobile commerce. Asymmetric algorithm like Diffie-Hellman can be used to encrypt the SMS message in M-commerce or mobile banking system. We use authentication functions to maintain the integrity of data. Password key exchange protocol based on Diffie-Hellman algorithm generates a secret shared key which can be used in message encryption and in MAC function. MAC (message authentication code) or hash functions are used maintain the integrity of message and can be used with the encryption. These functions also act as an error detecting code or checksum. This paper discusses the comparative analysis of both the authentication functions separately for password key exchange protocol by analyzing some of the security issues. The discussion of this paper concludes that MAC functions are more secure than hash function, but having greater complexity and take more to execute. So, it's better to use hash function for maintaining the integrity of message over a network where the transmitted amount of message is very small (SMS). Here, digital signature is generated with RSA to show the functionality of MD5 and SHA1, which prevents SMS from message modification and non-repudiation attack.
A Study on Diffie-Hellman Key Exchange Protocols
International Journal of Pure and Apllied Mathematics, 2017
Securing network traffic has always been a must requirement for any network application that employs insecure communication channel. The reason is to provide protection for the transmitted data over the network against unauthorized disclosure and modification of the messages between communicating parties. A Key exchange protocol is the cryptographic primitive that can establish a secure communication. The first Key exchange protocol was introduced by Diffie-Hellman. The purpose of the Diffie-Hellman protocol is to enable two parties to securely exchange a session key which can then be used for next symmetric encryption of messages. However, Diffie-Hellman itself does not authenticate the communicating entities. In this paper, we study on Diffie-Hellman Key exchange protocol. Subsequently describe authenticated key exchange protocol and One-pass key exchange protocol, which are the variants of Diffie-Hellman protocol.
International Journal of Security and Its Applications, 2017
In today's era ubiquitous computing is worldwide adopted. Internet is the main root for providing a ubiquitous network for communication between different people across the world, such communications can be through a wireless channel or wired channel that helps in getting messages or confidential information exchanged between different groups of people. Data security is of utmost importance because of wireless communications on insecure network. So the concept of cryptography is emerged which is nothing but known as an art of writing a secret code and it provide diverse set of services for protecting data over network such as authentication, confidentiality, non-repudiation and integrity. Cryptography offers wide range of algorithms which can help to guard communications over an insecure network such as symmetric encryption techniques which uses one key for encryption and decryption. For a symmetric cipher security can be compromised as it uses a single key, with this an advantage comes out while using an asymmetric security technique that makes use of a pair of keys to secure communications over unsafe channels. In this paper the positive characteristics of both the techniques discussed above are taken and a hybrid approach is used to guard messages on timid wireless medium. AES which is known as symmetric algorithm is combined with ECDH algorithm that is asymmetric by nature and is an amalgam of ECC and Diffie-Hellmananonymous key agreement protocol. Different text files are taken as input to the model with varying sizes. Encryption and decryption is performed using Advance encryption standard (AES) whereas ECDH will help in securing the communication for a session set up between client and server by generating key for AES. Also Diffie-Hellman will provide security by establishing a shared secret between client and server after successful key agreement. At last analysis of proposed model is done on the basis of different metrics like storage, encryption time, decryption time, correlation and avalanche effect. Proposed approach has been proven effective in reducing the gaps discovered in the present literature.
This paper aims at improving the security feature of One Time Password (OTP). Since all transactions are conducted in an open network, there is a high risk of confidential data attack by Man in the Middle or unauthorized users. Online service providers such as banks have developed a new security framework called One Time Password (OTP) to prevent sensitive information attack by MITM and other unauthorized users. OTP provides additional online protection for users. However, this approach can be hacked by MITM if the OTP is not properly protected. In this paper, a new security model is proposed to enhance the existing OTP approach using Deffie Hellman Key Exchange (DHKE) encryption and Advanced Encryption Standard (AES) algorithm. The proposed security model ensures that the OPT is encrypted using DHKE and AES before it is sent to the user's registered mobile number. The encrypted OTP is decrypted on the user's mobile phone, such that if there is an attack by MITM, it's the encrypted data that will be captured but not the original content.
An Approach to Cryptosystem through a Proposed and Secured Protocol
International Journal of Computer Applications, 2012
The Diffie-Hellman key algorithm was the first proposed public key algorithm by which two parties can communicate with each other without having any prior knowledge of each other over an insecure communication channel proposed by Harn.et.al. Diffie-Hellman key exchange algorithm is the most famous algorithm to exchange keys over a network but it has some false and drawbacks. So in our work we have proposed a new agreement protocol based on key confirmation as well as Diffie-Hellman algorithm. This protocol also works on the elliptic curve cryptography in asymmetric encryption.
Development of Cryptography-Based Secure Messaging System
Journal of Telecommunications System & Management, 2016
Today data communication is a modern technology that contains a powerful computer processor to exchange information. But brute force attacks are made to break the encryption techniques and these attacks are the main drawbacks of older algorithms. This paper is concerned with the development of a secure messaging system based on cryptographic algorithms that is which is more faster, better immune to attacks, more complex, easy to encrypt and many more advanced security feature included. This project work is designed and developed for a secure messaging both in web and android platforms. The application is well featured and provides encryption/decryption that can protect message from unauthorized access and disclosure over networks. To send message, a recipient or registered user types and encrypts a text message using keyword mono-alphabetic substitution algorithm with a key, selected from key list. The encrypted message is stored in the database and receiver's inbox with serial number of key (not the value). The receiver, after log into his/her own account, selects the key value and then decrypts the encrypted message with the key to see the original message. With compared to other messaging systems, the proposed secure messaging system can be used for chat, messaging, video conferencing and real time file sharing in both web and android platforms.
International Journal of Advances in Scientific Research and Engineering (ijasre), 2019
The key exchange process is a very important feature for many parts in cryptography. In data encryption, symmetric encryption techniques need to share the same secret key securely between two parties before encryption and this is a challenging task for secure data transmission. Most symmetric key encryptions and key management systems widely use Diffie-Hellman Key Exchange (DHKE) algorithm for the purpose of key distribution because it has simple computation and supports forward security. However, there is no key authentication and Man-In-The-Middle (MITM) attack has occurred during the key generation process. To overcome this problem, a new hash function is proposed to get the public key integrity during the public key sharing process of DHKE algorithm. This hash function is created by using six bitwise operators and operated in a variable length of the rounds depending on message length. Thus, the proposed system improves the security of DHKE and grantees the user authentication requirements.
A Secure Wireless Communication Protocol using Diffie - Hellman Key Exchange
International Journal of Computer Applications, 2015
In 1976, Diffie and Hellman in their path breaking paper [5] proposed a two party key agreement protocol based on finite field. Diffie-Hellman Key Exchange Protocol [DH protocol] has unique importance in two party wireless communication scenarios. After this protocol several protocols have been proposed bases on DH protocol but the Man in the middle attack raises a serious security concern on this protocol. Researchers have been working to overcome this security concern to design a new protocol. This paper proposes an authenticated key agreement protocol which is secure against Man in the middle attack. The authors also prove security issues of this protocol.