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The code in Example 1114 will behave correctly if it is executed verbatim, but if the code is compiled using some optimizing compilers, such as Microsoft Visual C++(R) NET and older versions of GCC 3x, the call to memset() will be removed as a dead store because the buffer pwd is not subsequently used [Howard and LeBlanc, 2002] Because the buffer pwd contains a sensitive value, the application might be vulnerable to attack if the data are left memory resident If attackers are able to access the correct region of memory, they could use the recovered password to gain control of the system The problem here is that many compilers and many programming languages do not take this and other security concerns into consideration in their efforts to improve ef ciency Optimizing compilers are a boon to performance, so disabling optimization is rarely a reasonable option The solution is to communicate to the compiler exactly how the program should behave Because support for this communication is imperfect and varies from platform to platform, current solutions to the problem are imperfect as well Current versions of GCC, such as 344 and 412, treat zero differently from other values when it is passed to memset() and do not optimize out calls to memset( ,0, ), but this behavior is neither advertised as a security feature or made an explicit part of the language through a separate function On compilers without this specialized behavior, it is often possible to force the compiler into retaining calls to scrubbing functions by using the variable in a function that has a simple external effect, such as printing its value, after it is cleaned in memory Another option involves volatile pointers, which are not currently optimized because they can be modified from outside the application You can make use of this fact to trick the compiler by casting pointers to sensitive data to volatile pointers, as shown in Example 1115. asp.net c# read pdf file read pdf content into text file using c# . net - MSDN - Microsoft
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asp.net core pdf editor i want to read a pdf file which contains empid and code for 100 nos..in front end i ll give specific empid..then the corresponding code has to be ... public class UniverseBuilder extends Object { // User-specified canvas Canvas3D canvas; // Scene graph elements to which the user may want access VirtualUniverse universe; Locale locale; TransformGroup vpTrans; View view; public UniverseBuilder(Canvas3D c) { thiscanvas = c; // Establish a virtual universe that has a single // hi-res Locale universe = new VirtualUniverse(); locale = new Locale(universe); // Create a PhysicalBody and PhysicalEnvironment object PhysicalBody body = new PhysicalBody(); PhysicalEnvironment environment = new PhysicalEnvironment(); // Create a View and attach the Canvas3D and the physical // body and environment to the view view = new View(); viewaddCanvas3D(c); viewsetPhysicalBody(body); viewsetPhysicalEnvironment(environment); // Create a BranchGroup node for the view platform BranchGroup vpRoot = new BranchGroup(); // Create a ViewPlatform object, and its associated // TransformGroup object, and attach it to the root of the // subgraph Attach the view to the view platform Transform3D t = new Transform3D(); tset(new Vector3f(00f, 00f, 20f)); ViewPlatform vp = new ViewPlatform(); vpTrans = new TransformGroup(t); word ean 13 barcode font, word dokument als qr code, word data matrix font, word pdf 417, word code 128 add in, birt data matrix how to read pdf file in asp.net c# Reading PDF documents in . Net - Stack Overflow
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asp.net open pdf file in web browser using c# vb.net Hi, Is there any way to read a PDF file using C# . net ? I have already used third party tools like itextsharp and its dlls. But it is not worthy. Is there ... void GetData(char *MFAddr) { char pwd[64]; if (GetPasswordFromUser(pwd, sizeof(pwd))) { if (ConnectToMainframe(MFAddr, pwd)) { // Interaction with mainframe } } memset(pwd, 0, sizeof(pwd)); *(volatile char*)pwd = *(volatile char*)pwd; } Version 11 Alpha 01, February 27, 1998 HelloUniverse: A Sample Java 3D Program vpTransaddChild(vp); vpRootaddChild(vpTrans); viewattachViewPlatform(vp); how to read pdf file in asp.net using c# how to read data from pdf file in asp . net ? - CodeProject
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convert pdf to tiff c# open source To implement this, you can have look over following url: http://naspinski.net/post/ ParsingReading-a- PDF - file -with-C-and- AspNet -to-text. aspx . The risk in relying on tricks, whether they are built into the compiler or the code itself, is that they rely on the current compiler behavior, which will continue to evolve in the future As compiler technology changes, security aws such as this one could be reintroduced even if an application s source code has remained unchanged Microsoft has taken the best approach thus far by adding a function specifically designed to erase memory securely On recent Microsoft platforms, use SecureZeroMemory(), which is a security-enhanced API that replaces memset() and ZeroMemory() [Howard, 2002], and is guaranteed to erase memory without the risk of being optimized out Although the current implementation of SecureZeroMemory() uses the volatile pointer trick, because its protection from optimization is part of the contract it offers users, it is protected from future changes in compiler behavior If compiler behavior does change in such a way that invalidates the current implementation, SecureZeroMemory() will be updated to continue to provide the same functionality in light of the new compiler behavior // Attach the branch graph to the universe, via the // Locale The scene graph is now live! localeaddBranchGraph(vpRoot); } public void addBranchGraph(BranchGroup bg) { localeaddBranchGraph(bg); } } Use static analysis to identify uses of memset() and other security-relevant operations that an optimizing compiler might remove The tool should not flag all calls to these functions only calls in which the memory being scrubbed is not referenced after the call Action windows are dialog boxes that request information for completing an action Open an action window if a user activates a menu command or command button that requires additional user input to complete an action Figure 16 shows an action window asp.net c# read pdf file C# Read PDF SDK: Read , extract PDF text, image contents from ...
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