Unmesh phalak (phalak)

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Unmesh phalak (phalak)

Terra: a virtual machine-based platform for trusted computing. ACM Press, The need arose from trying to isolate applications that require different security levels and use the same system. It was concluded that the closed-box VM abstraction is the basis of general-purpose trusted computing platform. Questions How does Revocation exactly work? How is hardware platform made tamper resistant?

Summary : The authors in this paper present the idea of trusted computing and also present Terra an implementation of arch based on this idea and trusted virtual machines TVMM.

The issues in commodity systems are poor isolation and absence of trust between application and user.

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Terra on the other hand is a secure, trusted and is a virtualized computing platform that overcomes these issues. Tamper resistant general purpose platform is partitioned in Terra to facilitate the running of both open-box and closed-box VMs that provides flexibility to applications in terms of their security needs. TVMM provides attestation capabilities and trusted path and in combination with hardware act as a trusted party that facilitate VMs to present the softwares they run to remote entities using cryptographic mechanisms.

The authors also evaluate Terra by using a varied range of applications. Confusion : Attestation process in more detail especially certification signing?

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Effect of TVMMs on performance? Summary The paper presents an architecture for trusted computing called Terra which allows applications of different security requirements to run simultaneously. Terra used trusted virtual machine monitors to partition a hardware platform into multiple, isolated virtual machines. This provides the semantics of running on separate dedicated dedicated hardware platform for closed systems while running side by side with normal applications open systems.

Terra provides a hardware interface, allowing an application designer to completely specify what software runs inside a VM based on security, compatibility and performance desired. Confusion What is tamper free hardware? What are the limitations in commodity OS that limit security and isolation? Could you discuss the steps of attestation in detail? The paper presents a trusted VMM that partitions tamper resistent hardware platform into multiple isolated virtual machines VMproviding appearance of multiple box on single general purpose platform.

This is done to provide two platforms"open" general purpose platform like todays PCs and "closed box" an opaque special purpose platform that protects privacy and integrity of its contents. Summary This paper describes Terra that is a flexible architecture for trusted computing. The main aim of Terra is to allow applications with different security requirements to run simultaneously on commodity hardware.

Initially, the authors describe the shortcomings of commodity hardware such as poor isolation, no mechanism to establish trusted paths etc. One of the key features of VMM is the way it provides attestation all the way the software stack via the use of certificate chains.Anubhavnidhi Abhashkumar anubhavnidhi cs. Krati Agrawal kagrawal cs. Naman Agrawal namanagr cs. Syed Suleman Ahmad suleman cs. Ainur Ainabekova ainabekova cs. Akanksha Akanksha aakanksha cs.

Aditya Kumar Akash aka cs. Mushahid Alam mushahid cs. Scott Anderson standerson cs. Jatin Arora jatinarora cs. Mukilan Ashok mukilan cs. Arjun Balasubramanian balarjun cs. Sakshi Bansal sakshi cs. Yelun Bao joezrock cs. Vanshika Baoni vbaoni cs. Aubrey Barnard barnard cs. Edward Barton eabarton cs. Kedar Bastakoti bastakoti cs. Karan Bavishi kbavishi cs. Timothy Becker tbecker cs. Tarun Bedi tarunbedi cs. Srilakshmi Bharadwaj smbharadwaj cs. Shubham Bharti skbharti cs.

Akshata Bhat akshatabhat cs. Prajna Bhat prajna27 cs.Usenix NSDI Summary : It is expensive to design highly available system to survive hardware failure as it involves using redundant special-purpose hardware and re-engineering software to include complicated recovery logic. They hence propose Remus - a virtual machine VM based whole system replication where the whole VM state is frequently checkpointed and the protected and backup VMs are located on different physical hosts.

Remus employs speculative execution where the state is buffered to synchronous backup later and execution is continued ahead of synchronous point. In addition to the above asynchronous replication is used where output at primary server is buffered allowing replication asynchronously and primary VM execution overlaps state transmission. The failure model of Remus is tolerable, protected system's data is left in crash-cosistent state and data is not visible until associated system is committed.

At every failure there was an observed drop in network throughput, outbound packet latency and performance whereas backup of disk image continued to be consistent. Confusion : 1 Which live migration approach pre-copy or post-copy is being used? Which approach would fair better for contributions such as pipelined checkpointing?

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Summary: This paper talks about Remus, a high availability service that allows unmodifed exisiting software to be protected from physical machine failures. Remus runs the application in a VM on a physical machine paired with another as backup host, it asynchronously propagates changed state to backup using checkpointinguses speculative execution to concurrently run active VM wiht backup.

At failure backup starts and resumes with the last checkpoint state. Remus guarentees to not lose any externally visible state regardless of the moment at which primary fails. Confusion: How the execution starts back again from failure? Does latency is taken into account during recovery?

Summary Remus was designed to provide high availability HA service that require no special purpose hardware or any modifications to existing OS. This uses speculative execution and VM-based asynchronous system replication with generality, transparency, seamless failure recovery being its primary goals.

Dirtied pages are replicated in four steps with this epoch-based pipelined checkpoint system for live migration. Since this was primarily designed for physical disaster recovery, there's a 25ms checkpoint with a 1s network delay in the evaluation carried out on top of Xen X Crash consistency is maintained in the failure of both the machines.

With its low cost and transparency, paired configuration provides HA dynamically with some performance overhead for low latency applications.

unmesh phalak (phalak)

Question Specific on Xen architecture: domain 0. What are lightweight copy-on-write snapshots used by Parallax? Summary This paper presents Remus, a general and transparent high availability service offered by a virtualization platform that protects existing unmodified software from failure when run on commodity hardware.

Dr. Sameer A Phalak

The whole state of the primary VM is asynchronously and frequently checkpointed to a backup VM on a different physical host they maintain the same system stateusing speculative execution the primary continues execution beyond the synchronous state. Outbound network packets are queued until checkpoint is acknowledged thus external state is synchronous and writes to active VM disks is configured to be write through to backup memory buffer.

The system functionality is validated as backup takes over for primary upon failure,and the performance is evaluated using different workloads. Posted by: shreya kamath April 21, AM. Remus is designed to allow applications to survive hardware failures.

It is a transparent because the application need not be changed at all and high availability complete replication service that allows existing unmodified software to be protected from failure of physical machine on which it runs.

It asynchronously propagates changed state to a backup host at frequencies as high as forty times a second, uses speculative execution to run the active VM ahead of the replicated system state. The network buffering required to ensure consistent replication imposes a performance overhead on applications that require very low latency.Construction work also suddenly got stalled on the project estimated to have a current worth of Rs 2, crores.

Work to construct the project began way back in and it was supposed to be built by As of now, Kohinoor Square can be seen as half-completed glass twin towers. However, in the plan changed and the builder decided to build twin towers. One of them would be for residential purposes while the other would consist of a five-star hotel along with commercial space for offices.

Construction work was normal until when there was a legal battle around the floor space index for a car park with the Brihanmumbai Municipal Corporation. It also underwent a change in design from an office project to a mixed-use building.

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The construction on the residential tower commenced in late and finished in While SSA and Kohinoor Group refused to comment on the development, a source from Edelweiss source stated that work will revive on Kohinoor Square from January 26 this year. The aim is to wrap it up within the next 18 months.

According to an Edelweiss executive, the completion of Kohinoor Square will be funded through its distress assets fund.

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Residential News 1 month ago. RealtyGURU 1 month ago. Special Reports 1 month ago.Improving the Reliability of Commodity Operating Systems. Michael M. Swift, Brian N. Bershad, and Henry M. Summary: The paper presents Nook, a reliability subsystem that aims to improve OS reliability by isolating the OS from driver failures. It emphasizes on preventing the majority of driver-caused crashes by minimal change to existing driver and system code, compared to assuring complete fault tolerance through new OS driver architecture which can lead to issues such as incompatibility.

It contains lightweight protection domains inside the kernel address space which comprise the isolated drivers, which prevents them to corrupt the kernel. The authors evaluate Nook by implementing it in the Linux OS. They present results that show Nook offers a considerable increase in reliability of OS, identifying and recovering from faults, hence preventing system crashes.

unmesh phalak (phalak)

A plus point for Nook is that even though it is designed for drivers, it can be extended to other kernel resource reliability. The authors state this by using it to isolate file system and in-Kernel internet service. Finally as it can run on commodity systems and supports existing C-language extensions it definitely fairs better than legacy specialized architecture and type safe languages.

Confusion: 1. Impact on memory due to the bookkeeping of various information for protection domains, threads, kernel state etc. Control flow between the various components.

Summary The authors have attempted to isolate the kernel extensions such as device drivers from the kernel in order to achieve fault resistance in the system. Nooks works within lightweight protection domains inside the kernel address space and is backward compatible requiring little code changes to driver or kernel. Extension Procedure Call XPC mechanism for isolation is similar to lrpc, this is for all extension-to-kernel and kernel-to-extension control flow.

For data flow, Nooks object tracking mechanism is enforced to avoid DMA misuse. Recovery functions detect and recover from faults: processor raises exception, extension improperly invokes a kernel function.


Wrappers are used for accessing all kernel structures. Overall, the solution provides isolation with compatibility and transparency for the commodity systems. This paper describes Nooks, a new operating system subsystem that aims to enhance OS reliability by isolating the OS from driver failures.

unmesh phalak (phalak)

Initially, the authors provide motivation for the proposed work by giving details regarding extensions being the major contributors to failures. Next, the authors describe the main goals of Nooks - isolation, recovery and backward compatibility, and move on to describe various features of the subsystem such as isolation, interposition, object tracking and recovery.

Lastly, the authors evaluate the proposed solution by implementing it Linux and the initial results seem promising.They love tranquility. They give in easily. They lack initiative. They like the opposite sex. Person with Phalak having 2 as Personality number give undue importance to family. More Numerology. Character Analysis of Phalak : Persons with the name Phalak, are seeker of wisdom and knowledge.

They have a deep desire and yearning to learn and they possess the abilities that will assist them in being a great teacher in any field. Love Life of Phalak : Persons are sexually free, love very much the appearance.

Persons like partner should attract them visually prior to be intellectual and communicative. Name Letter Analysis of Phalak. Acoording to vedic astrologyRashi for the name Phalak is Kanya and Moon sign associated with the name Phalak is Virgo. The name Phalak has Earth element. Mercury is the Ruling Planet for the name Phalak. Normally, people with the name Phalak listen to their heart rather than using their brain. Such people are shy and hesitant.

The name Phalak is suitable for baby born in Purva Ashadha nakshatra. The ratio of birth mark among babies is very high i. Baby girls have more probability of birth marks than baby boys.

Yes, diaper changing sessions for babies is a long tern procedure which goes on till the baby is around 2 - 3 years of age. This means that on an average a baby changes about diapers till it is trained for toilet.He attended and graduated from medical school inhaving over 11 years of diverse experience, especially in Internal Medicine.

Sameer A Phalak accepts Medicare-approved amount as payment in full. Call to request Dr. Sameer A Phalak the information Medicare information, advice, payment, Contact Dr. Sameer A Phalak by phone: for verification, detailed information, or booking an appointment before going to.

Home Physician Texas Humble Dr. Sameer A Phalak. Map and Directions.

Phalak Lekhan (फलक लेखन)

Accepts Medicare Assignment He does accept the payment amount Medicare approves and not to bill you for more than the Medicare deductible and coinsurance. In countries that follow the tradition of the United States, it is a first professional graduate degree awarded upon graduation from medical school. Sameer A Phalak has been primarily specialized in Internal Medicine for over 11 years of experience. A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly.

Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Most visited doctors.

Kanchan Phalak, M.D.

Recently added doctors. Accepts Medicare Assignment. He does accept the payment amount Medicare approves and not to bill you for more than the Medicare deductible and coinsurance. Broward Health Imperial Point. Broward Health Medical Center.

Holy Cross Hospital Inc. North Shore Medical Center. Plantation General Hospital.


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