One of the most critical issue to the wide adoption of cloud-based services is the concern about the client data confidentiality and computation integrity. Research work [Wang et al., 2015][Vasudevan et al., 2016] in the past on cloud platforms security has predominantly focused either on protecting these platforms from malicious cloud clients or on protecting cloud clients from each others unwanted activities. The problem of protecting clients from the possible malicious acts of insiders such as cloud providers is not adequately addressed. In this dissertation, we present a practical approach to protect client data confidentiality and computation integrity from cloud insiders, such as cloud administrator, in an infrastructure-as-a-service (IaaS) based cloud environment. Our approach makes use of remote attestation[Coker et al., 2011], and a late launch based technique, called Flicker[McCune et al., 2008], to verify the integrity of the cloud platform. This technique secures the virtual machine (VM) launch operation and further allows the launched VM to perform operations on sensitive data in full isolation. We have demonstrated through a real-world scenario of how the origin integrity and authenticity of health-care multimedia content processed on the cloud providers platform can be verified using digital watermarking in a secure and isolated execution environment without revealing the watermark details to the cloud administrator. We have also demonstrated using formal verification tool ProVerif that cryptographic operations and protocol communication cannot be compromised using a realistic attacker model. Performance analysis of our implementation demonstrates that it adds negligible overhead. In this dissertation, we have also presented a framework to rank cloud platform nodes according to the security guarantees they provide. Platform ranking helps to meet the needs of organizations with different security requirements. The framework introduces averification is indirectly perform Trusted Party (TP) for the verification of security properties of a cloud platform to the clients. The given framework is also thin client friendly as platform attestation and verification is indirectly performed through TP without the direct involvement of clients. Performance analysis shows that the cost of our presented approach is lower in order of magnitude when compared with traditional trusted computing based solutions.
مولانا مناظر احسن گیلانی حضرت الاستاذ رحمۃ اﷲ علیہ کا حادثہ وفات ابھی فراموش نہ ہوا تھا کہ آسمان علم و ادب کا ایک اور آفتاب غروب ہوگیا اور مولانا مناظر احسن گیلانی نے ۵؍ جون ۱۹۵۶ء کو انتقال کیا، وہ اپنے اوصاف و کمالات میں علمائے سلف کی یادگار اور علوم کی جامعیت، ذہانت و ذکاوت، دین و تقویٰ اور اخلاق و سیرت میں اس دور میں یگانہ تھے، جو اسلامی علوم میں ان کی نگاہ نہایت وسیع اور اس کی ہر شاخ میں ان کے قلم و زبان کی روانی یکساں تھی، اپنی ذہانت و اطباعی سے ایسے ایسے گوشوں سے معلومات و مسائل کا استنباط اور معمولی معمولی باتوں میں ایسے ایسے لطائف و نکات پیدا کرتے تھے کہ حیرت ہوتی تھی، علم ان کے تابع تھا وہ علم کے تابع نہ تھے ان کی ذہانت کتابوں کے انبار سے بے نیاز تھی، وہ تھوڑے معلومات سے ایسے مطول مضامین اور ضخیم کتابیں لکھ دیتے تھے جس کے لیے دوسرے مصنفین کو بڑے بڑے کتب خانوں کی ضرورت ہوتی ہے، ان کا نکتہ آفریں دماغ اور موّاج قلم جدھر رخ کردیتاتھا، تحریر کا دریا بہادیتا تھا، اور اپنے زور میں لعل و جواہر اور خس و خاشاک سب کو بہالے جاتا تھا۔ وہ ایک عرصہ تک جامعہ عثمانیہ کے شعبۂ دینیات کے صدر رہے، اور چوتھائی صدی سے زیادہ، ان کا علمی و تعلیمی فیض جاری رہا، اس زمانہ میں انھوں نے اپنے تلامذہ سے جو علمی و تحقیقی مقالات لکھوائے وہ اسلامی علوم کو جدید رنگ میں پیش کرنے کا ایک نمونہ ہیں، اس کے ذریعہ انھوں نے اس موضوع پر کام کرنے والوں کے لئے ایک شاہراہ قائم کردی۔ جامعہ عثمانیہ کے طلبہ میں اسلامی علوم پر تحقیقات اور جدید علوم سے ان کے موازنہ کا جو ذوق پیدا ہوا، اس...
This study aims to describe the effectiveness of the application of the jigsaw model in learning to write Indonesian exposition texts for class VIII SMP Negeri 4 Sendana in Majene. The type of research used is a quasi-experimental type experiment with two groups, namely the control group and the experimental group who were given a pretest and posttest. These two groups aim to prove whether the jigsaw learning model is effectively used or not in class VIII of SMP Negeri 4 Sendana. Before implementing Jigsaw Model, the results of the study suggest less successful, as shown by the 17 pupils who can only answer the questions that have been presented. As demonstrated by 51 students who were able to answer questions, the outcomes of studying exposition texts using the jigsaw learning approach in class VIII were successful.
Distance education can be regarded as mediated form of education relying on various forms media and technologies. At present, it encompasses emerging technologies such as computers, Internet, World Wide Web, Educational Television and Video- conferencing. Distance teaching institutions are using these technologies to make teaching learning process more effective. The present study was conducted with the main objectives (i) to evaluate the effectiveness of emerging technologies in teaching learning process in Pakistan (ii) to evaluate the impact of emerging technologies on teaching learning process, (iii) to identify the problems involved in the use of emerging technologies in distance education. The study was delimited to the graduate level (BCS) final semester students, tutors and academicians enrolled in semester spring 2003 at UKOU, STOU and V.U. of Pakistan. Clustered sampling technique was used and 70% students, 100% tutors and 60% academicians from each of the universities were taken as viisamples. For each sample, individual questionnaire was developed on five point (Likert) scale to elicit their opinions. Data collected from the questionnaire of students was analyzed also by Chi Square (χ 2 ) alongwith percentage and mean score and the data collected from questionnaires of tutors and academicians was analyzed by applying percentage and mean score. From the analysis of data it was found that emerging technologies have facilitated distance education as an interactive process. Computers had disseminated theoretical and practical activities for remedial teaching and learning providing text and graphics. Learning through interest and work as effective and students got a variety of relevant material on the topic. ETV has created awareness to adopt good learning experiences from other countries. Video-conferencing influenced more human resources and promoted active participation of students. Students faced problems in having access to them. Therefore, it was concluded that emerging technologies have made distance education more effective and efficient in promoting individual learning, improving intellectual level of students and pedagogical skills of tutors and academicians. On the basis of conclusions, it was recommended that (i) long-term and short- term training and retraining of tutors and academicians may be made necessary (ii) students may be provided opportunities of orientation sessions in order to develop skills of using these technologies efficiently (iii) study centers may be equipped with emerging technologies having efficient guidance and counseling services cell.