Vietnam listening posts?
And many other places they have gathered intelligence...
Actually, rereading the abstract, it seems that GP was spot on:P
Interesting idea, I wonder if that's ever been tried? I guess the feasibility depends on what the angular motions of these objects are.
In this case though, they "simply" take a lot of short-exposure images of the same region and add them together. From the abstract:
The technique relies on a combined use of a novel data processing approach and a new generation of high-speed cameras which allow taking short exposures of moving objects at high frame rates, effectively ``freezing'' their motion. Although the signal to noise ratio (SNR) of a single short exposure is insufficient to detect the dim object in one frame, by shifting successive frames relative to each other and then co-adding the shifted frames in post-processing, we synthetically create a long-exposure image as if the telescope were tracking the object with a significantly higher SNR.
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How is this in principle different from the known plaintext attacks (https://en.wikipedia.org/wiki/Known-plaintext_attack)?
These assume that the attacker knows both the encrypted version of the text and the original it was based on, and tries to glean information from their correlation.
Modern ciphers are made resistant even to chosen plaintext attacks, where the analyst knows the key and can tailor-make pairs of plain- and ciphertext.
On the other hand ANCHORY is an actual NSA system (http://www.fas.org/irp/program/disseminate/anchory.htm)
I guess they use both COTS and in-house developed software at NSA too...
They're claiming it will be ice free _by_ 2050, not spontaneously in that year! You can verify their claim every summer up to that year.
If their model says the trend is linear and they are right, half the ice is gone in 2032 (they'll probably have some feedback, so check their trend prediction).
Not true. The probability that the next letter in the OTP is (say) an A is always 1/26 when you have no prior knowledge about how the cipher clerk selected it. This is the optimal case, and any changes in how it is selected will only reduce the entropy of the pad.
*or did I just hear a whoosh over my head?*
But voters could see this (for all good it did them). With a closed computer system recognizing fraud is much more difficult.
The corrupted blood incident is actually better described as emergent behavior in a complex system.
The Blizzard developers didn't make a mistake, they just didn't think about all the consequences that debuff would cause in a world-like environment. And researchers had a field day studying the CB spread of the epidemic:)
The circuit Moon eventually built consisted of four sensors for four different molecules that fed into three two-input AND gates. If all four molecules were present, all three AND gates turned on and the last one produced a reporter protein that fluoresced red, so that the operation of the circuit could be easily monitored."
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When Bruce Schneier first published Applied Cryptographyin 1994, it was a watershed event, given that is was one of the first comprehensive texts on the topic that existed outside of the military.
In the nearly 20 years since the book came out, a lot has changed in the world of encryption and cryptography. A number of books have been written to fill that gap and Everyday Cryptography: Fundamental Principles and Applicationsis one of them that have recently been published.
While the title Everyday Cryptographymay give the impression that this is an introductory text; that is not the case. Author Keith Martin is the director of the information security group at Royal Holloway, a division of the University of London, and the book is meant for information security professionals in addition to being used as a main reference for a principles of cryptography course. The book is also a great reference for those studying for the CISSP exam.
While the book notes that almost no prior knowledge of mathematics is required since the book deliberately avoids the details of the mathematical techniques underpinning cryptographic mechanisms. That might be a bit of a misnomer as the book does get into the mathematics of cryptography. While the mathematics in the book is not overwhelming, they are certainly not underwhelming. For those that want a deeper look, the book includes an appendix for many of the mathematical concepts detailed in the book.
Two benefits of the book are that it stresses practical aspects of cryptography and real-world scenarios. The mathematics detailed avoids number throaty with a focus on practicability. It also shows how cryptography is used as the underlying technology behind information security, rather than simply focusing on the abstracts of the potential of cryptography.
With that, the books 13 (made up of 4 parts) chapters provide a comprehensive overview of the theory and practice around all as aspects of contemporary cryptography. Each of the chapters end with a summary, detailed lists of items for further reading, and sets of penetration questions that challenge the reader. Readers are advised to spend time on these questions as it is often easy for the reader to feel that they understand the material. The questions can quickly humble the reader and show them that it may not be the case.
Part 1 is titled Setting the Sceneand provides a comprehensive introduction to the fundamental of cryptography. Chapter 1 (freely available here) details the basic principles about cryptography and provides a high-level introduction.
Chapter 2 provides a good overview of the history of cryptography. It details a number of obsolete, yet historically relevant ciphers, such as the Vigenère cipher from the 1500's, to the Playfair cipher from the mid-1800's and others. Martin provides a good overview of the cryptanalysis of the Vigenère cipher and lessons learned from it.
Chapters 4-9 comprise part 2, and provide a thorough overview of the various forms of encryption (symmetric and asymmetric) and digital signatures. This section gets into some of the deeper mathematics of cryptography. While the author states that almost no prior knowledge of mathematics is needed; those without a background will surely be confused by some of the material.
Chapter 7 closes with a good overview of the relationship between digital signatures and handwritten signatures. The author notes the importance of resisting any temptation to consider digital signatures as a direct electronic equivalentof handwritten signatures. He then provides a detailed outline of the environmental, security, practical and flexibility differences between them.
Key management is one of the most important aspects of cryptography and often the most difficult to execute on. Part of the difficulty around key management is at the user level, with key updates, passphrase management and more. Ultimately, effective key management is essential to the underlying security of the cryptosystem. The 2 chapters in part 3 provide a thorough synopsis of the fundamentals of key management.
Part 4 closes the book with two chapters on practical cryptographic applications. Chapter 12 details how cryptography can be used on the internet, secure payment cards, video broadcasting and more.
The book concludes with an appendix on the mathematics of cryptography, which takes a look at the basic mathematical concepts the underlie some of the material in the book.
This book is not for the fainthearted and is not an introductory text on the topic. It is meant for the advanced reader or someone taking a college level course. For such a reader serious about a significant overview of the essentials on the topic, Everyday Cryptography: Fundamental Principles and Applicationsis an excellent reference.
Ben Rothkeis the author of Computer Security: 20 Things Every Employee Should Know."
According to Einstein’s theory of general relativity, a black hole’s mass and spin determine how close material can orbit before becoming unstable and falling in toward the event horizon. The team was able to measure this innermost stable orbit and found that it’s only 5.5 times the size of the black hole’s event horizon. This size suggests that the accretion disk is spinning in the same direction as the black hole.
The observations were made by linking together radio telescopes in Hawaii, Arizona, and California to create a virtual telescope called the Event Horizon Telescope, or EHT. The EHT is capable of seeing details 2,000 times finer than the Hubble Space Telescope."
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