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by lying, claims new book.
An important new book explains why some countries have become economic tigers in East Asia while others are relative failures or paper tigers. How Asia Works by Joe Studwell is essential reading for anyone interested in understanding the ingredients for economic success in the continent.
It challenges key tenets of the so-called Washington consensus, which prescribes free market solutions for all economies regardless of their level of development. Studwell establishes that a nation's development destiny is shaped most decisively by government action. History, writes the author, shows that markets are created, shaped and re-shaped by political power.
Studwell presents his case unambiguously, backing it by evidence. "No significant economy has developed successfully through policies of free trade and deregulation from the get-go." "Proactive interventions" have been essential in all cases of economic transformation as they fostered early accumulation of capital and technological learning.
The book does two important things. First, by a historical recall of the East Asian and Chinese experience it shows that for all the talk of an 'Asian miracle', countries in the region have followed different trajectories and policies, with sharply different outcomes. While Northeast Asian states achieved extraordinary progress and prosperity, Southeast Asian nations lagged behind, in part because they took poor advice from multilateral financial institutions and failed to heed the lessons of history. China, Japan, South Korea and Taiwan are all remarkable economic success stories. But the Philippines, Thailand and Indonesia, despite initial spurts in economic growth, slipped back and have remained relatively poor. This has created what the author calls "a tale of two East Asias".
Second, the book draws a distinction between the 'economics of development' and the 'economics of efficiency'. The first is like an education process where poor nations, lacking technological capacity and adequate human capital, acquire the skills necessary to compete globally. This requires investible funds, which in turn needs state intervention, "nurturing and protection as well as competition". However at a later stage of development, countries have to transition to the 'economics of efficiency' to achieve profitability. This requires less state intervention, more deregulation and freer markets.
From this emerges the author's central argument that economic development is a "stages game" with different policy solutions suited for different phases of development. Studwell delves into China and East Asia's varying experiences to substantiate this thesis. This leads to a provocative conclusion: "Poor states can only become rich by lying" — publicly supporting 'free market economics' advocated by the developed world, while pursuing "interventionist policies that are essential to become rich in the first place".
Studwell identifies three critical interventions that successful East Asian countries and China (after 1978) employed to achieve accelerated economic development. The first, "often ignored", and now "off the political agenda" in developing countries, is land reform. This restructured agriculture into highly labour-intensive household farming. In the early phase of development, with the necessary institutional support, this helped to generate a surplus, create markets and unlock great social mobility.
The second intervention, as countries cannot sustain growth only on agriculture and must transition to the next phase, is to direct entrepreneurs and investment to industrial manufacturing. Manufacturing allows for trade and technology learning. Studwell then demonstrates how nurturing and protection, along with instituting "export discipline", builds the capacity to compete globally.
The third intervention necessary for accelerated development is in the financial sector, aimed at directing capital initially to intensive, small-scale agriculture and to manufacturing rather than services. Studwell argues persuasively that it was the close alignment of finance with agriculture and industrial policy that produced Northeast Asia's success.
For Studwell, the 1997 Asian crisis underscored that these three interventions made the difference between sustained economic success and failure. But in Southeast Asian states, there was neither any real land reform nor creation of globally competitive manufacturing firms. This caused these countries to regress when their investment funds dried up.
Finally the author emphasises that these interventions take countries only to a certain development stage. Over time, these policies create problems and have to change as countries transition to the next phase, when the 'economics of efficiency' has to kick in.
The writer has served as Pakistan's ambassador to the US and United Kingdom. This article has been reproduced from Khaleej Times.


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Back To CourseHigh School US History: Help and Review
25 chapters | 307 lessons
African American, or black, history is a subject that has been largely repressed, rewritten, and condensed in the cataloging of American history. The colonization of Africa, the centuries of slavery, and the subsequent discrimination and marginalization of people of African descent have all contributed to an under-representation of black voices in the mainstream historical record. It is for these reasons that students are encouraged to study black history in its own right, as opposed to accepting the fragmented account provided in textbooks and broader overviews of American and world history.
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Study.com has a number of history courses with lessons in African American history and politics. The chapters and courses listed below offer video lessons, articles and quizzes to help students navigate through important eras in the complex history of Black America.
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Inflation in Czech Republic
Czech Republic - Inflation (end of period)
Inflation remains at Central Bank's target in December
Consumer prices rose 0.1% from the previous month in December, rebounding from November's 0.1% dip. Data released by the Czech Statistical Office (CSO) revealed that December's uptick was largely due to higher prices for food and non-alcoholic beverages.
Meanwhile, inflation was unchanged at November's 2.0% in December. As a result, it remained at the midpoint of the Central Bank's 1.0%–3.0% tolerance band. Similarly, annual average inflation remained stable at 2.2% for the third consecutive month in December.
Czech Republic Inflation Forecast
The Central Bank expects average inflation of 2.6% for 2019 and 2.0% for 2020. Met the why particular Consensus Forecast panelists project that inflation will average 2.3% in 2019, unchanged from last month's forecast, and 2.0% in 2020.
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Czech Republic: Inflation remains at Central Bank's target in December
January 11, 2019
Consumer prices rose 0.1% from the previous month in December, rebounding from November's 0.1% dip.
Czech Republic: Industrial production growth moderates in November
January 8, 2019
Industrial production rose 4.8% year-on-year in November, below October's strong 6.7% increase.
Czech Republic: Manufacturing sector contracts for the first time since July 2016
January 2, 2019
The manufacturing Purchasing Managers' Index (PMI) produced by IHS Markit slipped from 51.8 in November to 49.7 in December, the sixth consecutive monthly fall and the first contraction in over two years.
Czech Republic: Economic sentiment drops for the second consecutive month in December
December 27, 2018
The economic sentiment indicator, a composite confidence indicator published by the Czech Statistical Office (CSO), dipped from 99.3 points in November to 98.6 in December, the lowest reading since July 2017.
Czech Republic: Central Bank stands pat at last meeting of the year after four consecutive rate hikes
December 20, 2018
At its 20 December meeting, the Bank Board of the Czech National Bank (CNB) decided to keep the two-week repo rate unchanged at 1.75%, following four consecutive rate hikes.


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Limit Break - Let's discuss game clones.
Noteworthy News - Yonder coming to Nintendo Switch [http://rpgamer.com/news/Q1-2018/031918a.html]
Yakuza 6 demo is back out in the wild [http://rpgamer.com/news/Q1-2018/032018a.html]
Ys VIII Switch release date [http://rpgamer.com/news/Q1-2018/032118d.html]
West of Loathing is a Switch system exclusive [https://gematsu.com/2018/03/stick-figure-rpg-west-loathing-coming-switch]
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Today I got an email from one of the executives in charge of a project we are working on with our agency partner, Sage Growth. Sage Growth is a health and medical communications firm headquartered in Baltimore, Maryland. The email was short and sweet but screams a huge amount of success to me.
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It is the beginning of another year and the time when most of us make a resolution that we would like to achieve for both physical and emotional well-being. As a mother, it is natural to want the best for your little one. There is nothing more important than ensuring overall wellness for both you and your little one. This New Year, celebrate motherhood with a few simple tips thatll help you adopt a safe and gentle skin care regimen.
New York, June 19: Plant-based diets can be beneficial for diabetes as a new study has found that it may improve glycemic control, cholesterol and lead to weight loss in people with Type 2 diabetes.
New York, June 18: Gut bacteria plays a key role in infusing negative feelings in the brains of obese people, causing depression and anxiety, researchers say.
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New York, June 14: Finding it hard to get a proper night sleep? A higher religious involvement can reduce stress levels and lead to healthier sleep outcomes, say researchers.
New York, June 14: Girls who binge on alcohol may fail to reach their peak bone mass, increasing their risk of fractures in adulthood as well as osteoporosis -- a condition in which bones become weak and brittle, according to researchers.
London, June 13: A high blood pressure level but still below the usual threshold for treating hypertension can put 50-year-olds at increased risk of developing dementia later, revealed a study led by an Indian-origin researcher.
© 2019 Forsythe Media Group, LLC. All Rights Reserved.


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Forty five bodies will be taken to an interdenominational prayer meeting in Solai on Wednesday.
President Uhuru Kenyatta and DP William Ruto are expected at the service in honour of people who died after Patel Dam burst and water swept through a village.
Forty eight people died while many were displaced as their houses were destroyed. The search for bodies has been going on since the incident took place last Wednesday night.
Also read: 40 still missing as Solai deaths hit 48
Twelve of the victims will be buried at the public cemetery while one will be buried in Kitale on Friday. Other funeral services will take place at the farms in the area.
There is a row over the body of an eight-year-old that was found on Monday, as two families have claimed it.
The relatives of people killed in the Solai dam tragedy collect their bodies ahead of an interdenominational prayer meeting, May 16, 2018. /RITA DAMARY
Speaking at the mortuary today, Nakuru Public Health Officer Samuel Kingori said the government pathologist had taken samples for tests.
Security was beefed up in the area ahead of the prayers as families collected the bodies.
On Tuesday, Patel Dam owner Mansukh Patel said the burst pointed to heavy rainfall in Dundori Forest.
The farmer explained further that the rains eroded the soil.
"With high pressure, water accompanied by dead stumps, logs and big boulders hit the wall of the dam causing a huge gush of water into the farm and outlying settlements," he said.
Last week, the water authority said the was built illegally. The dam is one of a number on a sprawling farm near Solai.
More on this: Heavy rainfall caused Solai Dam burst, Patel says, promises help
Read: Patel Dam was built illegally - water authority


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कृपया लॉगिन या पंजीकरण करे.


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Information Hiding by Stochastic Diffusion and its Application to Printed Document Authentication
- Beverly Berry
- 3 years ago
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1 ISSC 2009, UCD, June 10-11th Information Hiding by Stochastic Diffusion and its Application to Printed Document Authentication SFI Stokes Professor of DSP Faculty of Engineering Dublin Institute of Technology Jonathan Blackledge and Eugene Coyle School of Electrical Engineering Systems Faculty of Engineering Dublin Institute of Technology Abstract The use of image based information exchange has grown rapidly over the years in terms of both e-to-e image storage and transmission and in terms of maintaining paper documents in electronic form. Further, with the dramatic improvements in the quality of COTS (Commercial-Off-The-Shelf) printing and scanning devices, the ability to counterfeit electronic and printed documents has become a widespread problem. Consequently, there has been an increasing demand to develop digital watermarking, information hiding and covert encryption methods which can be applied to both electronic and printed images (and documents) for the purposes of authentication, prevent unauthorized copying and, in the case of printed documents, withstand abuse and degradation before and during scanning. In this paper we consider the background to a new method to hiding image based information by diffusing it with a stochastic field (uniformly distributed noise). This diffusion only approach is used specifically to design a system for authenticating printed information that is robust to a low resolution print-scan cycle. Keywords Information Hiding, Stochastic Diffusion, Print Authentication. I Introduction In this paper, an approach to image information hiding is presented and some possible applications considered. It is based on computing a scrambled image by diffusing an input image with a stochastic field (a cipher). For e-to-e applications, a cover image (covertext) can be applied subject to a user defined diffusion-to-covertext ratio. The information is subsequently recovered by removing the covertext and then correlating the output with the original (key dependent) cipher. This approach provides the user with a method of hiding imagebased information in a host image before transmission of the data. In this sense, the method provides a steganographic approach to transmitting encrypted information that is not apparent during an intercept [1]. Decryption is based on knowledge of the key(s) and access to the host image. With regard to digital image analysis and e-to-e communications, the method provides a way of embedding information in an image that can be used for authentication from an identifiable source, a method that is relatively insensitive to lossy compression, making it well suited to digital image transmission. However, with regard to document authentication, use of a covertext is not robust. The reason for this is that the registration of pixels associated with a covertext can not be assured when the composite image is printed and scanned. We therefore consider a diffusion only approach to document authentication. This is because the process of diffusion (i.e. the convolution of information with a cipher) is compatible with the physical principles of an imaging systems and thus, with image capture devices (digital cameras and scanners, for example) that, by default, conform to the physics of optical image formation [2]. The diffusion of plaintext (in this case, an image) with a stochastic field (the cipher) has a synergy with the encryption of plaintext using a cipher and an XOR operation (when both the plaintext and cipher are represented as binary streams) [3], [4]. However, decryption of a convolved im-
2 age (deconvolution) is not as simple as XORing the ciphertext with the appropriate cipher. Here, we consider an approach which is based on preconditioning the original cipher in such a way that decryption (de-diffusion) can be undertaken by correlating the ciphertext with the cipher. The output ciphertexts generated for printed document authentication are textures of a type that are determined by the spectral characteristics of the plaintext which can be applied using low resolution Commercial-Off-The-Shelf (COTS) printers and scanners. In this sense, the approach is based on a form of texture coding. II Stochastic Diffusion and Confusion In terms of plaintexts, diffusion is concerned with the issue that, at least on a statistical basis, similar plaintexts should result in completely different ciphertexts even when encrypted with the same key. This requires that any element of the input block influences every element of the output block in an irregular fashion. In terms of a key, diffusion ensures that similar keys result in completely different ciphertexts even when used for encrypting the same block of plaintext. This requires that any element of the input should influence every element of the output in an irregular way. This property must also be valid for the decryption process because otherwise an intruder may be able to recover parts of the input from an observed output by a partly correct guess of the key used for encryption. The diffusion process is a function of the sensitivity to initial conditions, conditions that all cryptographic systems should have. Further, all cryptographic systems should exhibit an inherent topological transitivity causing the plaintext to be mixed through the action of the encryption process. The process of confusion ensures that the (statistical) properties of plaintext blocks are not reflected in the corresponding ciphertext blocks. Every ciphertext must have a random appearance to any observer and be quantifiable through appropriate statistical tests. Diffusion and confusion are processes that are of fundamental importance in the design and analysis of cryptological systems, not only for the encryption of plaintexts but for data transformation in general. Consider the fundamental imaging equation given by [6] u(x, y) = p(x, y) 2 u 0 (x, y) + n(x, y) where u 0 is the input (information associated with the object plane ) u is the output (information associated with the image plane ), p is the Point Spread Function (PSF), n is the noise function (where Pr[n(x, y)] is, ideally, known a priori 1 ) 1 Pr denotes the Probability Density Function. and 2 denotes the two-dimensional convolution integral. In optics, both the operator 2 and the functional form of p are derived from solving a physical problem (using a Green s function solution) compounded in a particular Partial Differential Equation (e.g. the wave equation or the diffusion equation) [5]. For example, if u is taken to be due to the diffusion of light through an optical diffuser and thereby a solution to the diffusion equation (with initial condition u 0 ), then at a time T ( x 2 + y 2 ) p(x, y) = exp 4DT where D is the Diffusivity of the diffuser. This is an example of Gaussian diffusion since the characteristic Point Spread Function is a Gaussian function. However, in general, a variety of PSFs are possible with regard to the fundamental imaging equation and the imaging systems to which it applies as a basic model. The PSF of an imaging system is fundamental to its characterisation and may be derived theoretically and/or experimentally. However, in Cryptology, we are free to choose any PSF. Stochastic diffusion involves interchanging the roles of p and n, i.e. replacing p(x, y) - a deterministic PSF - with n(x, y) - a stochastic function. Thus, stochastic or noise diffusion is compounded in the result u(x, y) = n(x, y) 2 u 0 (x, y) + p(x, y) where p can now be any function including a stochastic function, i.e. u(x, y) = n 1 (x, y) 2 u 0 (x, y) + n 2 (x, y) where both n 1 and n 2 are stochastic functions which may be of the same type (i.e. have the same PDFs) or of different types (with different PDFs). The simplest form of stochastic diffusion is based on the equation u(x, y) = n(x, y) 2 u 0 (x, y). There are two approaches to solving the inverse problem: Given u and n, obtain u 0. We can deconvolve by using the convolution theorem giving [ u 0 (x, y) = F2 1 U(kx, k y )N ] (k x, k y ) N(k x, k y ) 2 where N is the Fourier transform of n, U is the Fourier transform of u, F2 1 denotes the (twodimensional) inverse Fourier transform and k x and k y are the spatial frequencies in the Fourier plane. However, this approach requires regularization in order to eliminate any singularities when N 2 0 through application of a constrained deconvolution filter such as the Wiener filter [7]. Alternatively, if n is the result of some random number generating algorithm, we can construct the
3 stochastic field m(x, y) = F 1 2 [ N ] (k x, k y ) N(k x, k y ) 2 where N(k x, k y ) 2 > 0, the diffused field now being given by u(x, y) = m(x, y) 2 u 0 (x, y). The inverse problem is then solved by correlating (denoted by 2 ) u with n, since 2 and n(x, y) 2 u(x, y) N (k x, k y )U(k x, k y ) N (k x, k y )U(k x, k y ) = N (k x, k y )M(k x, k y )U 0 (k x, k y ) = N (k x, k y ) N (k x, k y ) N(k x, k y ) 2 U 0(k x, k y ) = U 0 (k x, k y ) so that u 0 (x, y) = n(x, y) 2 u(x, y). The condition that N(k x, k y ) 2 > 0 is simply achieved by implementing the following process: k x, k y, if N(k x, k y ) 2 = 0, then N(k x, k y ) 2 = 1. This result can be used to hide an image in another image as discussed in the following section. III Digital Image Watermarking Consider the case when we have two independent images i 1 (x, y) 0 x, y and i 2 (x, y) 0 x, y and we consider the case of embedding i 1 with i 2. We construct a stochastic field m(x, y) 0 x, y a priori and consider the equation where u(x, y) = rm(x, y) 2 i 1 (x, y) + i 2 (x, y) (1) m(x, y) 2 i 1 (x, y) = 1 and i 2 (x, y) = 1. By normalising the terms in this way, the coefficient 0 r 1 can be used to adjust the relative magnitudes of the terms such that the diffused image i 1 is a perturbation of the host image (covertext) i 2. This provides us with a way of digital watermarking [8] one image with another, r being referred to as the watermarking ratio 3. For applications in image watermarking, stochastic diffusion has two principal advantages: (i) a stochastic field provides more uniform diffusion than a deterministic function does; (ii) stochastic fields can be generated using random number generators that 2 Where denotes the transformation from image to Fourier space. 3 Equivalent, in this application, to the standard term Signal-to-Noise or SNR ratio as used in signal and image analysis. Fig. 1: Example of watermarking one image with another using stochastic diffusion. The host image i 2 (top-left ) is watermarked with the watermark image i 1 (top-centre) using the diffuser (top-right) which is uniformly distributed random noise n whose pixel-by-pixel values depend upon the seed used (the private key). The result of computing m 2 i 1 (bottom-left) is added to the host image for r = 0.1 in equation (1) to generate the watermarked image u (bottom-centre). Recovery of the watermark image i 1 (bottom-right) is accomplished by subtracting the host image from the watermarked image and correlating the result with n. depend on a single initial value or seed (i.e. a private key). An example of this approach is shown in Figure 1. Here, an image i 2 (the host image ) is watermarked with another image i 1 using stochastic diffusion. Because r = 0.1, the output u is only slightly perturbed by the stochastic field m(x, y) 2 i 1 (x, y) and hence u i 2 (at least from a visual perspective). a) Stochastic Field Generation The stochastic field n used to compute m, can be generated using a range of (uniformly distributed) pseudo random number generators based on conventional (substitution) encryption algorithms coupled with existing key exchange protocols. The output array n is normalized so that n = 1 and used to generate n(x, y) on a rowby-row or column-by-column basis. Recovery of the watermark image requires knowledge of two keys: (i) the key used to generate n; (ii) the host image i 2. b) Statistical Analysis The expected statistical distribution associated with stochastic diffusion is Gaussian. This can be shown if we consider i 1 to be a strictly deterministic function described by a sum of N delta functions. Thus if then i 1 (x, y) = N i=1 j=1 N δ(x x i )δ(y y j ) u(x, y) = m(x, y) 2 i(x, y)
4 N N = m(x x i, y y j ). i=1 j=1 Each function m(x x i, y y j ) is just m(x, y) shifted by x i, y j and will thus be identically distributed. Hence, from the Central Limit Theorem N N Pr[u(x, y)] = Pr m(x x i, y y j ) = i=1 j=1 N Pr[m(x, y)] Pr[m(x, y)] 2 Pr[m(x, y)] 2... i=1 and we can expect Pr[u(x, y)] to be normally distributed for large N. IV Print Authentication The approach discussed in Section III can be used generally for e-to-e type communications where there is no loss of information. Steganography and watermarking techniques for hardcopy data (print) authentication have to be robust to the significant distortions generated by the printing and scanning processes as well as general soiling incurred through day-to-day use. If a watermarked image is printed and scanned back into electronic form, then the print/scan process will yield an array of pixels that will be different from the original electronic image even though it might look similar. These differences can include the size of the image, its orientation, brightness, contrast and so on. a) Diffusion Based Method With respect to equation (1), of all the processes involved in the recovery of the watermark, the subtraction of the host image from the watermarked image is critical. If this process is not accurate on a pixel-by-pixel basis and deregistered for any of many reasons, then recovery of the watermark by correlation will not be effective. However, if we make use of the diffusion process alone, then the watermark can be recovered via a print/scan because of the compatibility of the optical processes involved (i.e. convolution of an object function with the PSF). Depending on the printing process applied, a number of distortions will occur which diffuse the information being printed. Thus, in general, we can consider the printing process to introduce an effect that can be represented by the convolution equation u print = p print 2 u. where u is the original electronic form of a diffused image (i.e. u = m 2 i where i is the input image) and p print is the PSF of the printer. An incoherent image of the data, obtained using a flat bed scanner, for example (or any other incoherent optical imaging system), will also have a characteristic PSF p scan. Thus, we can consider a scanned image to be given by u scan = p scan 2 u print where u scan is taken to be the digital image obtained from the scan. Now, because convolution is commutative, we can write where u scan = p scan/print 2 m 2 i = m 2 p scan/print 2 i p scan/print = p scan 2 p print which is the print/scan point spread function associated with the processing cycle of printing the image and then scanning it. Thus, the process u(x, y) = m(x, y) 2 i(x, y) used to generate the data u and the process i(x, y) = n(x, y) 2 u(x, y) used to recover the image i produces a reconstruction for i whose fidelity is determined by the scan/print PSF. The principal requirement to do this in practice, is to re-size the scanned image back to the size of the original digital image i. This is due to the scaling relationship (for a function f with Fourier transform F ) f(αx, βy) 1 ( αβ F kx α, k ) y. β The size of an image captured by a scanner or other device will depend on the resolution used. The size of the image obtained will inevitably be different from the original because of the resolution and window size used to print the diffused image u and the resolution used to scan the image. Since scaling in the spatial domain causes inverse scaling in the Fourier domain, the scaling effect must be inverted before the watermark can be recovered by correlation since correlation is not a scale invariant process. Re-sizing the image (using an appropriate interpolation scheme such as the bi-cubic method, for example) requires a set of two numbers N 1 and N 2 (i.e. the N 1 N 2 array used to generate n and m) that, along with the key required to regenerate n, provides the private keys needed to recover the data from the diffused image. An example of this approach is given in Figure 2 which shows the result of reconstructing four different images (a photograph, finger-print, signature and text) used in the design of an impersonalized bank card. The use of diffusion only watermarking for print security can be undertaken in colour by applying exactly the same diffusion/reconstruction methods to the red, green and blue components independently (as illustrated in Figure 2). Because this method is based on convolution alone, the reconstruction is not negated
5 Fig. 2: Example of the application of diffusion only watermarking. In this example, four images of a face, fingerprint, signature and text have been diffused using the same stochastic field m and printed on the front (top-left) and back (bottom-left) of an impersonalized identity card using a 600 dpi printer. The reconstructions (top-right and bottom-right, respectively) are obtained using a conventional flat-bed scanner operating at 300 dpi. by any distortion of the PSF associated with the print/scan process, just limited or otherwise by its characteristics. Thus, if an image is obtained of the printed data field which is out of focus due to the characteristics of pscan/print, then the reconstruction of will be out of focus to the same degree. Decryption of images with this characteristic is only possible using an encryption scheme that is based on a diffusion only approach. The tolerance of this method to printing and scanning is excellent (details of which lie beyond the scope and extent of this paper) provided the output is cropped accurately (to within a few pixels) and oriented correctly. Figure 3 shows another example of the technique applied to a composite image scanned from a passport, an application which is cheap and simple to implement with regard to authenticating a passport holders personal information. The degradation associated with the reconstruction is due to the low resolution of the printing and scanning rather than the information hiding method. Unless the correct stochastic field is used (as determined by the keys), it is not possible to reconstruct the image making counterfeiting or forgery improbable. b) Covert Information Hiding Digital watermarking is usually considered to be a method in which the watermark is embedded into a host image in an unobtrusive or near-unobtrusive way. In the context of the approach considered here, this can be achieved if we diffuse the host image with another image to generate a stochastic field. Consider two images i1 and i2. Suppose we con- Fig. 3: Example of the stochastic diffusion method applied to passport authentication: Original image scanned from a passport at 400dpi (above), printed image after applying stochastic diffusion (centre) and reconstruction after scanning the printed stochastic field at 300dpi (below).
6 struct the following function n = F 1 2 ( I1 I 1 2 I 2 where I 1 = F 2 [i 1 ] and I 2 = F 2 [i 2 ]. If we now correlate n with i 1, then from the correlation theorem ) i 1 2 n I 1 I 1 I 1 2 I 2 i 2. In other words, we can recover i 2 from i 1 with knowledge of n. Because this process is based on convolution and correlation alone, it is compatible and robust to printing and scanning, i.e. incoherent optical imaging as discussed in Section IV(a). An example of this is given in Figure 4. In this scheme, the host image can be considered to be a public key and the stochastic field n the private key required to reconstruct the hidden image. Clearly, in the context of this public/private key paradigm, the private key needs to be encrypted in order to ensure the security of any system that is based on this approach. V Application to Covert Encryption One of the principal components associated with the development of methods and algorithms to break ciphertext is the analysis of the output generated by an attempted decrypt and its evaluation in terms of an expected type. The output type is normally assumed to be plaintext, i.e. to be in the form of characters, words and phrases associated with a natural language. For e-to-e applications, if a plaintext document is converted into an image file, then the method described in Section IV(b) on Covert Information Hiding can be used to diffuse the plaintext image i 2 using any other image i 1 to produce the field n. If both i 1 and n are then encrypted, any attack on these data will not be able to make use of an analysis cycle which is based on the assumption that the decrypted output is plaintext. This approach provides the user with a relatively simple method of confusing the cryptanalyst and invalidates attack strategies that have been designed and developed on the assumption that the encrypted data have been derived from plaintext alone. VI Conclusions The approach discussed in this paper is robust to a wide variety of attacks including geometric attacks, drawing, crumpling and print/scan attacks, details of which lie beyond the scope of the paper. The method is relatively insensitive to lossy compression, filtering, amplitude adjustments, additive noise and thresholding (for a binary input). The principal weakness of the system is its sensitivity to rotation and cropping. This can be minimized by orienting the document correctly and Fig. 4: Example of a covert watermarking scheme. i 1 (top-left) is processed with i 2 (top-middle) to produce the stochastic field n (top-right). i 2 is printed at 600 dpi, scanned at 300 dpi and then re-sampled back to its original size (bottom-left). Correlating this image with n generates the reconstruction (bottom-centre). The reconstruction depends on just the host image and n. If the n and/or the host image are different or corrupted, then a reconstruction is not achieved, as in the example given (bottom-right). accurately before scanning and using automatic cropping software which is available with selected scanners (e.g. Cannon scanners). The visibility of the ciphertext generated through the process of stochastic diffusion (e.g. Figures 2 and 3) and the compatibility of this approach with the physical principles of an imaging system (convolution of an object function with the PSF), increase the robustness associated with the retrieval of the hidden information after scanning at low resolution. References [1] N. Ferguson and B. Schneier B, Practical Cryptography, Wiley, [2] M. Born and E. Wolf, Principles of Optics (6th Edition), Pergamon Press, Oxford, [3] J. Buchmann, Introduction to Cryptography, Springer, [4] O. Goldreich, Foundations of Cryptography, Cambridge University Press, [5] E. G. Steward, Fourier Optics: An Introduction, Horwood Scientific Publishing, [6] J. M. Blackledge, Digital Image Processing, Horwood Publishing, [7] M. Bertero and B. Boccacci, Introduction to Inverse Problems in Imaging, Institute of Physics Publishing, [8] I. J. Cox, M. L. Miller and J. A. Bloom, Digital Watermarking, Morgan Kaufmann, 2002.
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text:
Bessica Raiche
By: Jelisa
All About Bessica Raiche
These are something's about Bessica Raiche. People called her Bessie for short instead of calling her Bessica. She was born in 1875 and died in April 11 1932. Her favourite actives she loved to do was swimming and shooting. She was the first to fly a solo plane. Her fifth flight she crashed. When she crashed she was fine. She was the first women to crash a plane. Her first flight was in September 16 1910. These are something's about Bessica Raiche .
Bessica's Plane
Bessica Raiche got marred and moved to New York. Her and her husband decided to make a plane in New York. They build the plane pieces in their living room. They used bamboo and silk to make the plane Lighter. They putted the plane pieces together in their backyard. Then she tried the plane and it flew. Which means the plane worked!!! After her and her husband made a company called The French-American Aeroplane Company. The company made planes. One of the planes was made in Bessica's desing . That is about Bessica's plane.