Browsing by Author "Rahman, M. Lutfar"

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A SECURED MESSAGE TRANSACTION APPROACH BY DYNAMIC HILL CIPHER GENERATION AND MESSAGE DIGEST CONCATENATION
(2010-01-01) Jabiullah, M. Ismail; Sarker, Md. Zakaria; Rahman, Anisur; Rahman, M. Lutfar
Secured message transactions are very much desirable for electronic communications in so many ways. A secured message transaction technique has been designed, developed and implemented using Java programming language. For this, a symmetric key encryption technique dynamic Hill cipher has been used for message encryption-decryption with a dynamic key length. A square-matrix of the given key length has been generated with the property that modulo operation of the product of the matrix and the inverse of that matrix is identity. The intended message is converted into binary form. Performs the bitwise-XOR operation of the equal two halves of the binary form and repeats the operations 3 times to generate the message digest (MD), and concatenate it with the message. Encrypts them using the Hill cipher technique with the key matrix and then send them to the destination. In the receiving end, the reverse process is performed to retrieve the message in secured manner. This process can be applied in many cryptographic applications as well as research works.
Network architecture and security issues in campus networks
(IEEE Xplore, 2014-01-30) Nadir Bin Ali, Mohammed; Rahman, M. Lutfar; Hossain, Syed Akhter
Network architecture with its security is a growing concern in the present time. A campus network faces challenges to address core issues of security which are governed by network architecture. This paper is mainly targeted towards campus networks which deliver required security. This is essential because, it prevents the institution from suffering any significant attacks associated with network. A university network has a number of uses such as teaching, learning, research, management, e-library, and connections with the external uses. Therefore, network architecture and its security are vital issues for any university. In this work, a network infrastructure is proposed on the basis of the practical and experimental requirements. The proposed network infrastructure is realizable with adaptable infrastructure. Full Text Link: http://doi.org/10.1109/ICCCNT.2013.6726595
Perception of Vowels and Dental Consonants in Bangla Speech Processing
(IGI Global, 2013) Hossain, Syed Akhter; Rahman, M. Lutfar; Ahmed, Faruk; Sobhan, M. Abdus
The aim of this chapter is to clearly understand the salient features of Bangla vowels and the sources of acoustic variability in Bangla vowels, and to suggest classification of vowels based on normalized acoustic parameters. Possible applications in automatic speech recognition and speech enhancement have made the classification of vowels an important problem to study. However, Bangla vowels spoken by different native speakers show great variations in their respective formant values. This brings further complications in the acoustic comparison of vowels due to different dialect and language backgrounds of the speakers. This variation necessitates the use of normalization procedures to remove the effect of non-linguistic factors. Although several researchers found a number of acoustical and perceptual correlates of vowels, acoustic parameters that work well in a speaker-independent manner are yet to be found. Besides, study of acoustic features of Bangla dental consonants to identify the spectral differences between different consonants and to parameterize them for the synthesis of the segments is another problem area for study. The extracted features for both Bangla vowels and dental consonants are tested and found with good synthetic representations that demonstrate the quality of acoustic features. Full Text Link: http://doi.org/10.4018/978-1-4666-3970-6.ch011