Thursday, April 27, 2017

Protecting data in the cloud

Protecting data in the cloud


A new hardware design makes data encryption more secure by disguising cloud servers’ memory-access patterns.


Cloud computing — outsourcing computational tasks over the Internet — could give home-computer users unprecedented processing power and let small companies launch sophisticated Web services without building massive server farms.

But it also raises privacy concerns. A bank of cloud servers could be running applications for 1,000 customers at once; unbeknownst to the hosting service, one of those applications might have no purpose other than spying on the other 999.

Encryption could make cloud servers more secure. Only when the data is actually being processed would it be decrypted; the results of any computations would be re-encrypted before they’re sent off-chip.

In the last 10 years or so, however, it’s become clear that even when a computer is handling encrypted data, its memory-access patterns — the frequency with which it stores and accesses data at different memory addresses — can betray a shocking amount of private information. 

At the International Symposium on Computer Architecture in June, MIT researchers described a new type of secure hardware component, dubbed Ascend, that would disguise a server’s memory-access patterns, making it impossible for an attacker to infer anything about the data being stored. Ascend also thwarts another type of attack, known as a timing attack, which attempts to infer information from the amount of time that computations take.

Computational trade-off

Similar designs have been proposed in the past, but they’ve generally traded too much computational overhead for security. “This is the first time that any hardware design has been proposed — it hasn’t been built yet — that would give you this level of security while only having about a factor of three or four overhead in performance,” says Srini Devadas, the Edwin Sibley Webster Professor of Electrical Engineering and Computer Science, whose group developed the new system. “People would have thought it would be a factor of 100.”

The “trivial way” of obscuring memory-access patterns, Devadas explains, would be to request data from every address in the memory — whether a memory chip or a hard drive — and throw out everything except the data stored at the one address of interest. But that would be much too time-consuming to be practical.

What Devadas and his collaborators — graduate students Ling Ren, Xiangyao Yu and Christopher Fletcher, and research scientist Marten van Dijk — do instead is to arrange memory addresses in a data structure known as a “tree.” A family tree is a familiar example of a tree, in which each “node” (in this example, a person’s name) is attached to only one node above it (the node representing the person’s parents) but may connect to several nodes below it (the person’s children).

With Ascend, addresses are assigned to nodes randomly. Every node lies along some “path,” or route through the tree, that starts at the top and passes from node to node, without backtracking, until arriving at a node with no further connections. When the processor requires data from a particular address, it sends requests to all the addresses in a path that includes the one it’s really after.

To prevent an attacker from inferring anything from sequences of memory access, every time Ascend accesses a particular memory address, it randomly swaps that address with one stored somewhere else in the tree. As a consequence, accessing a single address multiple times will very rarely require traversing the same path.

Less computation to disguise an address

By confining its dummy requests to a single path, rather than sending them to every address in memory, Ascend exponentially reduces the amount of computation required to disguise an address. In a separate paper, which is as-yet unpublished but has been posted online, the researchers prove that querying paths provides just as much security as querying every address in memory would.

Ascend also protects against timing attacks. Suppose that the computation being outsourced to the cloud is the mammoth task of comparing a surveillance photo of a criminal suspect to random photos on the Web. The surveillance photo itself would be encrypted, and thus secure from prying eyes. But spyware in the cloud could still deduce what public photos it was being compared to. And the time the comparisons take could indicate something about the source photos: Photos of obviously different people could be easy to rule out, but photos of very similar people might take longer to distinguish.

So Ascend’s memory-access scheme has one final wrinkle: It sends requests to memory at regular intervals — even when the processor is busy and requires no new data. That way, attackers can’t tell how long any given computation is taking.

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Perlakuan mulia terhadap perempuan menarik remaja inggris memeluk islam

Perlakuan mulia terhadap perempuan menarik remaja inggris memeluk islam


Seorang remaja perempuan di Univeristy College London (UCL) memeluk Islam sebab terpesona akan cara Islam memuliakan perempuan. Berharap dapat membantu kesalahpahaman terhadap Islam, terkhusus dalam hak-hak perempuan, ia berbagi cerita keislamannya dengan kawan kuliahnya dalam Islam Awareness Week (Pekan Kesadaran Islam).

Sara Lawler (19) yang tumbuh menjadi seorang pemeluk Kristen telah masuk Islam pada Desember tahun lalu.
“Alasan utama saya untuk berpindah ke Islam adalah karena Islam memberikan para wanita kehormatan dan hak-hak asasi yang tidak diberikan lagi oleh masyarakat,” ujar Sara kepada Lancashire Evening Post pada Jum’at (15/3/2013), seperti dikutip Onislam.

“Ini (Islam) adalah jalan hidup yang murni, damai dan menghadirkan yang terbaik dalam hidup,” katanya.
Sara lahir di Preston, Inggris, dan ia juga pernah tinggal di Tanzania, India dan Midlands.
Sara pernah sekolah di sebuah SMA Katolik khusus perempuan, Our Lady’s Catholic High School, di Preston, selama satu tahun.

Dia mengatakan ia melihat para murid sekolah meminum minuman keras (khamr) atau memilik anak di luar nikah dan ia tidak ingin menjalani hidup seperti itu. Sara tidak pernah mengkuti gaya hidup kawan-kawannya seperti meminum khamr, sehingga setelah memeluk Islam hidupnya tidak banyak berubah.

Saat tinggal di Qatar bersama orangtuanya, saat itu ia pertama kali tertarik pada Islam.
“Ketika Saya pergi ke Qatar, semua teman saya adalah Muslim, saya lebih banyak bergaul dengan Muslim daripada anak-anak Inggris,” kata mahasiswi UCL jurusan fotografi itu.

Sara mengucapkan syahadat secara resmi pada Desember lalu. Sekarang ia berusaha menjadi Muslimah yang baik, melaksanakan shalat lima waktu dan memakai kerudung.

Sara mengatakan bahwa pakaian Muslimah bukanlah sebuah penindasan terhadap Muslimah, tetapi bentuk penghormatan hak asasi wanita.

“Ini tidaklah menindas perempuan melainkan membebaskan mereka karena mereka memilih siapa yang melihat tubuh mereka daripada pria dan masyarakat yang memilih apa yang harus dilihat (sesuai keinginan mereka -red),” katanya.

“Islam memberikan perempuan ke status yang tinggi dan menekankan peran-peran perempuan serta bagaimana mereka perlu untuk dihormati dan dihargai,” katanya.

Beruntung, orangtua Sara tidak keberatan dengan keislamannya, bahkan melihat manfaatnya.
“Orangtua saya baik-baik saja tentang hal ini. Mereka tahu bahwa ini (Islam) adalah agama yang baik, merkea telah melihat kebaikan yang telah dihasilkan darinya,” katanya.

 http://www.arrahmah.com/news/2013/03/15/perlakuan-mulia-terhadap-perempuan-menarik-remaja-inggris-memeluk-islam.html#sthash.yxSzwnmF.dpuf

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Photo Opportunity Lunar Eclipse Early Saturday Morning

Photo Opportunity Lunar Eclipse Early Saturday Morning


Howdy

The diagram shows where the moon will be ink the western sky at 5 am about 20 minutes or so after the partial eclipse has started

Put your camera on a tripod, have fun, and at least enjoy the event!

Eclipse 5am

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If there are hills on your horizon, or you live in a valley...the moon may be obscured by the hills at Totality

This diagram is for 6:30 am near Mid-eclipse

Mid eclipse

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For details about the eclipse go to Sky & Telescopes web site

http://www.skyandtelescope.com/observing/highlights/A-Dawn-Eclipse-of-the-Moon-134436603.html

NewImage

 

 

 

 

 

 

 

 

 

 

 

 

You have almost an hour  when the Moon is Totally eclipsed from 6:05 to to 6:57 am

But Moon will be really low in the sky in the North West , it will set when the sun rises.

Sunrise Saturday morning is: 7:39am

December 10ths Total Lunar Eclipse
Event

UT

CSTMSTPST
Penumbra first visible?12:056:05 a.m.5:05 a.m.4:05 a.m.
Partial eclipse begins12:456:45 a.m.5:45 a.m.4:45 a.m.
Total eclipse begins14:05—7:05 a.m.6:05 a.m.
Mid-eclipse14:32—7:32 a.m.6:32 a.m.

Total eclipse ends

14:57—7:57 a.m.6:57 a.m.
Partial eclipse ends16:18———

 

Enjoy!!!

 


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Pengisian dan Pengosongan Kapasitor

Pengisian dan Pengosongan Kapasitor


Prinsip Pengisian dan Pengosongan Kapasitor 

 Kapasitor adalah komponen elektronika yang dapat menyimpan muatan listrik sehngga pada aplikasinya banyak digunakan untuk membuat osilasi, timer, serta penstabil tegangan pada rangkaian power supply.

Kapasitor dapat menyimpan muatan listrik sesuai dengan kapasitas kapasitansinya.

C = Q. V

keterangan:
C= kapasitansi kapasitor [ Farad ]
Q = Muatan Listrik [ Coulumb ]
V = tegangan [Volt]

Proses pengisian muatan kapasitor dapat dilihat pada gambar dibawah ini:
kapasitor1

Pada saat saklar / switch ditekan maka kapasitor akan membentuk loop tertutup dengan battery 9 Volt, maka kapasitor akan melakukan pengisian sampai dengan tegangan pada kapasitor sama dengan tegangan pada baterry, dapat dilihat pada tampilan grafiknya.

Proses pengosongan muatan kapasitor dapat dilihat pada gambar dibawah ini:
kapasitor2


Pada saat saklar / switch dilepas maka polaritas positf kapasitor akan terhubung singkat dengan polaritas negatif kapasitor, maka kapasitor akan melakukan pengosongan muatan sampai dengan tegangan pada kapasitor habis, dapat dilihat pada tampilan grafiknya.

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Wednesday, April 26, 2017

PhotoLine 19 free download full crack x32 x64 bit

PhotoLine 19 free download full crack x32 x64 bit


PhotoLine 19 Full Version Free Download With Crack & Serial Key
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PhotoLine 19
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PhotoLine 19 Features:
  • Included easy bar-code & calender creator.
  • Smart & perfect color management system.
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PhotoLine 19 Download Links
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