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Extract Text from a Specific Rectangular Area in PDF using C# .... NET applications to read , write and manipulate PDF documents without using Adobe Acrobat. Security researchers have devised approaches that can find pairs of input strings that result in the same hash (Wang, Yin, and Yu 2005). As of the writing of this book, to find a collision against SHA-1, approximately 263 hash computations need to be performed. While the use of SHA-1 may continue to be secure for some applications (such as HMAC-SHA-1), it may be acceptable only in the very near future. The attacks against MD5 are more serious, and you should probably transition away from it immediately, if you have not done so already. Hash functions are widely used in the MAC and digital signature schemes that we described in this chapter. Since the attacks are collision attacks, not pre-image attacks, all is not lost. An attacker would not be able to use these attacks to fake an arbitrary digital signature on an existing document. However, an attacker that has access to lots of computational power may be able to use these attacks to construct two new documents that result in the same hash, obtain a digital signature on one of them, and claim that the other was signed. Nevertheless, the security landscape continues to change as new attacks are discovered from time to time, and we provide a section of our web site, www.learnsecurity.com/ntk, dedicated to keeping you up-to-date on the security of hash functions. As a result of some of these attacks, NIST has recommended that SHA-1 be phased out by 2010 in favor of newer variants of SHA, such as SHA-256 and SHA-512. SHA-256, like SHA-1, takes 512 bits of input, but produces 256 bits of output. SHA-512 takes 1024 bits of input and produces 512. itextsharp read pdf fields vb.net: Read text from PDF using iTextSharp vb.net pdf read text Manipulating PDF files with iTextSharp and VB . NET 2012 - CodeGuru
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How to extract plain text from PDF file using PDFBox. NET ... How to extract text from PDF files using iTextSharp library. ... Tags: pdf pdfbox ikvm. net vb parsing. While we mentioned SSL as early as in 1, we only now have covered all of the necessary background to explain how it works. SSL uses both symmetric and asymmetric cryptography, as well as signatures and MACs to provide authentication, confidentiality, and message integrity between a client and a server. We only provide a high-level summary of how SSL works here. In some parts of our explanation, we sacrifice pure technical accuracy for clarity of the explanation. For more details, see Eric Rescorla s SSL and TLS, and the SSL/TLS specification (Dierks and Rescorla 2006). In the remainder of this section, we use notation for protocol messages similar to that in the SSL/TLS specification. In the following discussion, we describe the steps required in a full SSL handshake. A handshake, in our context, is the set of steps that a client and server must execute in order to start exchanging sensitive application-level data. The goal of the handshake is for the client Summary vb.net read pdf to text NET PDF Text Extractor & Converter - Extract Text from PDF C#/ VB ...
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Hi, I need to read and parse a PDF file that has 50,000 pages. The "Save As" option within the Acrobat Reader is not of much use. The PDF file ... vb.net pdfreader class: Manipulating PDF files with iTextSharp and VB.NET 2012 - CodeGuru
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