Haidar Jabbar | Anna University (original) (raw)

Papers by Haidar Jabbar

Research paper thumbnail of A Secure Designated Signature Scheme

Annotation: This paper presents a threshold designated receiver signature scheme that includes ce... more Annotation: This paper presents a threshold designated receiver signature scheme that includes certain characteristic in which the signature can be verified by the assistance of the signature recipient only. The aim of the proposed signature scheme is to protect the privacy of the signature recipient. However, in many applications of such signatures, the signed document holds data which is sensitive to the recipient personally and in these applications usually a signer is a single entity but if the document is on behalf of the company the document may need more than one signer. Therefore, the threshold technique is employed to answer this problem. In addition, we introduce its use to shared signature scheme by threshold verification. The resultant scheme is efficient and dynamic.

Research paper thumbnail of An Efficient RSA Public Key Encryption Scheme

In this paper, we propose an efficient RSA public key encryption scheme, which is an improved ver... more In this paper, we propose an efficient RSA public key encryption scheme, which is an improved version of original RSA scheme. The proposed RSA encryption scheme is based on linear group over the ring of integer mod a composite modulus n which is the product of two distinct prime numbers. In the proposed scheme the original message and the encrypted message are h h u square matrices with entities in n z indicated via ) , ( n z h l . Since the original RSA Scheme is a block cipher in which the original message and cipher message are integer in the interval ] 1 , 0 [ n for some integer modulus n .Therefore, in this paper, we generalize RSA encryption scheme in order to be implemented in the general linear group on the ring of integer mod n . Furthermore, the suggested encryption scheme has no restriction in encryption and decryption order and is claimed to be efficient, scalable and dynamic.

Research paper thumbnail of An Integrated Quantitative Assessment Model For Usability Engineering

Journal of Computer Science, 2007

Many different quantitative assessment models have been proposed to measure and report the usabil... more Many different quantitative assessment models have been proposed to measure and report the usability of a general software product for various business and design purposes. However, there are several problems coupled with existing models that consequently bias and affect the process and results of the usability assessment. Moreover, they do not aid their usage by analysts who are not experienced in the filed of usability. Therefore, an integrated, accurate, consolidated and simple usability assessment model is required, to provide an entire construct of usability for general software products. In this paper, we proposed an Integrated Quantitative Assessment Model for Usability Engineering (IQAMUE) for measuring and reporting usability for general software products. The contribution of the IQAMUE has been done at several points: (1) The investigation into existing models that represents usability factors, either by standard bodies or by well-known researches in the field of usability. As a result, we have proposed an improved comprehensive model, which integrates potential and general usability factors, and measure their related metrics in a standard way (2) We have proposed an adjustable sample size estimation model for usability assessment, which enhances the estimation process, by using historical data to gain an initial idea of the software product, and on present data to predict the complexity of the software product (3) For the applicability purpose of the proposed model, we have conducted an empirical case study for a local e-mail system (Eudora V7) to examine and practice the proposed model.

Research paper thumbnail of A Secure Designated Signature Scheme

Annotation: This paper presents a threshold designated receiver signature scheme that includes ce... more Annotation: This paper presents a threshold designated receiver signature scheme that includes certain characteristic in which the signature can be verified by the assistance of the signature recipient only. The aim of the proposed signature scheme is to protect the privacy of the signature recipient. However, in many applications of such signatures, the signed document holds data which is sensitive to the recipient personally and in these applications usually a signer is a single entity but if the document is on behalf of the company the document may need more than one signer. Therefore, the threshold technique is employed to answer this problem. In addition, we introduce its use to shared signature scheme by threshold verification. The resultant scheme is efficient and dynamic.

Research paper thumbnail of An Efficient RSA Public Key Encryption Scheme

In this paper, we propose an efficient RSA public key encryption scheme, which is an improved ver... more In this paper, we propose an efficient RSA public key encryption scheme, which is an improved version of original RSA scheme. The proposed RSA encryption scheme is based on linear group over the ring of integer mod a composite modulus n which is the product of two distinct prime numbers. In the proposed scheme the original message and the encrypted message are h h u square matrices with entities in n z indicated via ) , ( n z h l . Since the original RSA Scheme is a block cipher in which the original message and cipher message are integer in the interval ] 1 , 0 [ n for some integer modulus n .Therefore, in this paper, we generalize RSA encryption scheme in order to be implemented in the general linear group on the ring of integer mod n . Furthermore, the suggested encryption scheme has no restriction in encryption and decryption order and is claimed to be efficient, scalable and dynamic.

Research paper thumbnail of An Integrated Quantitative Assessment Model For Usability Engineering

Journal of Computer Science, 2007

Many different quantitative assessment models have been proposed to measure and report the usabil... more Many different quantitative assessment models have been proposed to measure and report the usability of a general software product for various business and design purposes. However, there are several problems coupled with existing models that consequently bias and affect the process and results of the usability assessment. Moreover, they do not aid their usage by analysts who are not experienced in the filed of usability. Therefore, an integrated, accurate, consolidated and simple usability assessment model is required, to provide an entire construct of usability for general software products. In this paper, we proposed an Integrated Quantitative Assessment Model for Usability Engineering (IQAMUE) for measuring and reporting usability for general software products. The contribution of the IQAMUE has been done at several points: (1) The investigation into existing models that represents usability factors, either by standard bodies or by well-known researches in the field of usability. As a result, we have proposed an improved comprehensive model, which integrates potential and general usability factors, and measure their related metrics in a standard way (2) We have proposed an adjustable sample size estimation model for usability assessment, which enhances the estimation process, by using historical data to gain an initial idea of the software product, and on present data to predict the complexity of the software product (3) For the applicability purpose of the proposed model, we have conducted an empirical case study for a local e-mail system (Eudora V7) to examine and practice the proposed model.