noor ikram | Hasanuddin University (original) (raw)
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Centre National de la Recherche Scientifique / French National Centre for Scientific Research
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Papers by noor ikram
Traditionally SSL/TLS protocol is used to provide secure and trusted communication by implementin... more Traditionally SSL/TLS protocol is used to provide secure and trusted communication by implementing public key cryptographic algorithms such as RSA, DSA and DH. These algorithms have several performance and scalability issues for real time (audio, video, instant messaging) streaming and messaging. Against large sized RSA keys, ECC based public key cryptography offers equivalent security with smaller key length, entailing high
Journal of Alloys and Compounds, 2010
Structural, electronic and optical properties of ternary alloy system Cd x Zn 1−x S have been stu... more Structural, electronic and optical properties of ternary alloy system Cd x Zn 1−x S have been studied using first-principles approach based on density functional theory. Electronic structure, density of states and energy band gap values for Cd x Zn 1−x S are estimated in the range 0 ≤ x ≤ 1 using both the standard local density approximation (LDA) as well as the generalized gradient approximations (GGA) of Wu-Cohen (WC) for the exchange-correlation potential. It is observed that the direct band gap E − g of Cd x Zn 1−x S decreases nonlinearly with the compositional parameter x, as observed experimentally. It is also found that Cd s and d, S p and Zn d states play a major role in determining the electronic properties of this alloy system. Furthermore, results for complex dielectric constant ε(ω), refractive index n(ω), normalincidence reflectivity R(ω), absorption coefficient˛(ω) and optical conductivity (ω) are also described in a wide range of the incident photon energy and compared with the existing experimental data.
Traditionally SSL/TLS protocol is used to provide secure and trusted communication by implementin... more Traditionally SSL/TLS protocol is used to provide secure and trusted communication by implementing public key cryptographic algorithms such as RSA, DSA and DH. These algorithms have several performance and scalability issues for real time (audio, video, instant messaging) streaming and messaging. Against large sized RSA keys, ECC based public key cryptography offers equivalent security with smaller key length, entailing high
Journal of Alloys and Compounds, 2010
Structural, electronic and optical properties of ternary alloy system Cd x Zn 1−x S have been stu... more Structural, electronic and optical properties of ternary alloy system Cd x Zn 1−x S have been studied using first-principles approach based on density functional theory. Electronic structure, density of states and energy band gap values for Cd x Zn 1−x S are estimated in the range 0 ≤ x ≤ 1 using both the standard local density approximation (LDA) as well as the generalized gradient approximations (GGA) of Wu-Cohen (WC) for the exchange-correlation potential. It is observed that the direct band gap E − g of Cd x Zn 1−x S decreases nonlinearly with the compositional parameter x, as observed experimentally. It is also found that Cd s and d, S p and Zn d states play a major role in determining the electronic properties of this alloy system. Furthermore, results for complex dielectric constant ε(ω), refractive index n(ω), normalincidence reflectivity R(ω), absorption coefficient˛(ω) and optical conductivity (ω) are also described in a wide range of the incident photon energy and compared with the existing experimental data.