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and number of components, the traditional installation method installing the OS one component at a time, with each component having its own set of con guration steps was going to result in extremely long installation times for Windows Vista It was decided instead to rst perform the installation of Windows Vista at Microsoft, and then a SYSPREP installation would be captured to an image An image-based installation would then be performed for end users and businesses This meant Microsoft needed an image format of its own and a method to distribute the image for both home and business users Microsoft created the Windows Imaging Format (WIM) that, unlike many other technologies, was a le-based format for storing information in a single cabinet format-type structure This enabled the format to use single-instance storage, which saved space by storing any duplicate les found in an installation only once instead of multiple times This may not seem to be a big deal However, consider the Windows Resource Protection that Windows Vista employs to protect the OS (the replacement for Windows File Protection present in Windows 2000 and XP) It includes the duplication of key les needed to boot Windows Vista that are stored in the %Windir%\winsxs\Backup folder and take up around 500MB With singleinstance storage, this duplicated 500MB is not stored twice, saving 500MB from the size of the image Coupled with compression technologies, a WIM le of an OS is typically one third the size of the partition it is capturing This single-instance storage enables another cool feature Over the years, the number of editions of Windows has grown However, these different versions share mostly the same core set of les, and so Microsoft now ships all versions of Windows Vista on one media, with all sharing a single WIM le Because the Windows media now contains all the versions of the OS, Microsoft can enable another interesting feature: Anytime Upgrade If initially you install a lower version of Vista and want to upgrade, all you need is a new product key; the Vista DVD and the components that are part of the upgrade Vista will be installed This new key is available via the indows Anytime Upgrade component of Vista The Windows Anytime Upgrade (as with any upgrade) performs a full Vista upgrade in the same way as upgrading XP to Vista; new components are not just installed, but the entire OS is redeployed to the machine, with the previous settings and programs migrated to the new OS The rst support for the WIM format was via the System Management Server OS Deployment Feature Pack, which used an early 09 version of the WIM format, but utilized PE-based wizards to capture and deploy.

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and number of components, the traditional installation method installing the OS one component at a time, with each component having its own set of con guration steps was going to result in extremely long installation times for Windows Vista It was decided instead to rst perform the installation of Windows Vista at Microsoft, and then a SYSPREP installation would be captured to an image An image-based installation would then be performed for end users and businesses This meant Microsoft needed an image format of its own and a method to distribute the image for both home and business users Microsoft created the Windows Imaging Format (WIM) that, unlike many other technologies, was a le-based format for storing information in a single cabinet format-type structure This enabled the format to use single-instance storage, which saved space by storing any duplicate les found in an installation only once instead of multiple times This may not seem to be a big deal However, consider the Windows Resource Protection that Windows Vista employs to protect the OS (the replacement for Windows File Protection present in Windows 2000 and XP) It includes the duplication of key les needed to boot Windows Vista that are stored in the %Windir%\winsxs\Backup folder and take up around 500MB With singleinstance storage, this duplicated 500MB is not stored twice, saving 500MB from the size of the image Coupled with compression technologies, a WIM le of an OS is typically one third the size of the partition it is capturing This single-instance storage enables another cool feature Over the years, the number of editions of Windows has grown However, these different versions share mostly the same core set of les, and so Microsoft now ships all versions of Windows Vista on one media, with all sharing a single WIM le Because the Windows media now contains all the versions of the OS, Microsoft can enable another interesting feature: Anytime Upgrade If initially you install a lower version of Vista and want to upgrade, all you need is a new product key; the Vista DVD and the components that are part of the upgrade Vista will be installed This new key is available via the Windows Anytime Upgrade component of Vista The Windows Anytime Upgrade (as with any upgrade) performs a full Vista upgrade in the same way as upgrading XP to Vista; new components are not just installed, but the entire OS is redeployed to the machine, with the previous settings and programs migrated to the new OS The rst support for the WIM format was via the System Management Server OS Deployment Feature Pack, which used an early 09 version of the WIM format, but utilized PE ased wizards to capture and deploy.

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second input which has the same hash value as any given input Thus given an nput x, it should be infeasible to nd any other input y such that both x and y hash to the same value Note that the function x 2 mod n does not have this property as both x and x have the same hash value Strong collision resistance implies that it is computationally infeasible to nd any two distinct inputs which hash to the same value Thus, in this case, it is infeasible to nd any x and y values such that both x and y have the same hash value Note that this is stronger than weak collision resistance since for the weak collision resistance property we x one of the inputs while for the strong collision property we do not x either of the inputs Thus, strong collision resistance does imply weak collision resistance In addition there are other properties such as noncorrelation, near-collision resistance and partial pre-image resistance that are desirable in hash algorithms used as cryptographic primitives Noncorrelation ensures that the input and output bits of the hashing function are not correlated In fact, an avalanche property, whereby any change in one of the input bits causes at least half of the output bits to change randomly, is desirable Near-collision resistance ensures that it is dif cult to nd any two inputs whose hash values differ in only a small number of bits Partial pre-image resistance makes it as hard to recover any portion of the input as it is to recover the entire input given the hash value A hash value is very frequently used to create a digital signature In this case, the hash value of a message is created and the signer signs the hash value rather than signing the message This is more ef cient from the point of view of performance since a hashing primitive is much faster than an asymmetric cryptographic primitive In addition, a hash value can be used to detect changes to a message provided that the corresponding hashing algorithm has been designed such that collisions are computationally dif cult to nd Thus, the hashing functions are used mainly to ensure data integrity and message authentication Secure hash algorithm (SHA) is a widely used hashing algorithm SHA was designed by NIST and NSA in 1993 and revised in 1995 as SHA-1 This algorithm takes an arbitrarily sized input and produces 160 bit hash values A message is processed in terms of 512 bit chunks over four rounds of 20 steps each SHA-256, SHA-384, and SHA-512 have also been speci ed These produce 256, 384 and 512 bit hash values Given that SHA-1 produces 160 bit hash values, the probability of nding a collision is negligibly small More precisely, this probability is one in 280 (follows from the birthday paradox) Thus, if we hashed 280 messages, we would nd one pair of messages that hashed to the same value This is the brute force approach to nding collisions for hashing algorithms It is clear that the dif culty of this approach depends on the size of the output hash value It is desirable that the brute force approach be the best way to determine collisions for a given hash algorithm To break a hash algorithm, an adversary will have to be able to nd collisions while expending fewer cycles than needed by the brute force approach SHA-1 has been broken using this de nition The authors in [9] have shown the ability to nd collisions in SHA-1 using about 263 calculations In order to understand the gravity of the problem, note that using today s technology it is expected that 260 calculations might require a couple of days On the positive side, however, note that these are collision attacks and not attacks on the pre-image property of SHA-1, and collision attacks are typically important in the case of digital signatures As a result, many protocols will not be impacted by this result In addition, leveraging these theoretical results to design software.

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The DataTextFormatString is a changeable value containing the formatting tring used to control how data bound to the list control is displayed. Table 6.1 contains a list of available formatting characters. A format string must be provided that contains placeholder zero only. A format string can contain literals and can contain placeholder zero multiple times. Placeholder zero must be in the format {0:Cn}, where C is a valid format character and n is an integer representing the quantity of digits. The following format string is valid:. format string is valid: Control barcode code39 data on java to draw barcode 3 of .Related: Code 128 Printing .NET WinForms , UPC-A Creating .NET , Generate Data Matrix Java

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