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26 Nov 2018 ... iTextSharp is a popular library for working with PDF files. ... Sample PDF form to show how to dynamically fill out a form using iTextSharp library for ... Open );; ICollection fieldNames = samplePDFFormService. .... NET core, Asynchronous programming, Azure, C# , Devops, Hibernate, IIS, Java, Javascript ... hardware acceleration, the time to crack can be reduced by more than 30 times In fairness, the 20 computers would have to be P4 36 GHz machines or better If you chose to go the FPGA route, you would be spending a lot of money to crack that WEP key Because smart enterprises will no longer be using WEP, you are not likely getting access to any information that is as valuable as your hacking network The dictionary attack method relies on the fact that humans often use words as passwords The key then is to use a dictionary cracking tool that understands the conversion algorithm used by a hardware vendor to convert the typed password into the WEP key This algorithm is not part of IEEE 80211 and is implemented differently by the different vendors Many vendors allow the user to type a passphrase that is then converted to the WEP key using the Neesus Datacom or MD5 WEP key generation algorithms The Neesus Datacom algorithm is notoriously insecure and has resulted in what is sometimes called the Newsham 21-bit attack because it reduces the usable WEP key pool to 21 bits instead of 40 when using a 40-bit WEP key This smaller pool can be exhausted in about 6 to 7 seconds on a P4 36 GHz single machine using modern cracking tools against a pcap file Even MD5-based conversion algorithms are far too weak and should not be considered secure because they are still used to implement WEP, which is insecure due to weak IVs as well The weak IV attacks are based on the faulty implementation of RC4 in the WEP protocols The IV is prepended to the static WEP key to form the full WEP encryption key used by the RC4 algorithm This means than an attacker already knows the first 24 bits of the encryption key, since the IV is sent in cleartext as part of the frame header Additionally, Fluhrer, Mantin, and Shamir identified weak IVs in a paper released in 2001 These weak IVs result in certain values becoming more statistically probable than others and make it easier to crack the static WEP key The 80211 frames that use these weak IVs have come to be known as interesting frames With enough interesting frames collected, you can crack the WEP key in a matter of seconds This reduces the total attack time down to less than 5 to 6 minutes on a busy WLAN The weak IVs discovered by Fluhrer, Mantin, and Shamir are now among a larger pool of known weak IVs Since 2001, another 16 classes of weak IVs have been discovered by David Hulton (h1kari) and KoreK What if the WEP-enabled network being attacked is not busy and you cannot capture enough interesting frames in a short window of time The answer is a re-injection attack This kind of attack usually re-injects ARP packets onto the WLAN The program aireplay can detect ARP packets based on their unique size and does not need to decrypt the packet By re-injecting the ARP packets back onto the WLAN, it will force the other clients to reply and cause the creation of large. c# asp.net pdf viewer: Displaying a pdf file from Winform - Stack Overflow pdf viewer winforms c# C# PDF Viewer opensource | The ASP . NET Forums
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How to extract plain text from PDF file using PDFBox. ... public static string ExtractTextFromPdf(string path) { using ( PdfReader reader = new PdfReader ( path)) ... amounts of WLAN traffic very quickly For 40-bit WEP cracking, you usually want around 300,000 total frames to get enough interesting frames, and for 104-bit WEP cracking, you may want about 1,000,000 frames Storage attacks are those methods used to recover WEP or WPA keys from their storage locations On Windows computers, for example, WEP keys have often been stored in the registry in an encrypted form An older version of this attack method was the Lucent Registry Crack; however, it appears that the problem has not been fully removed from our modern networks An application named wzcook can retrieve the stored WEP keys used by Windows Wireless Zero Configuration This application recovers WEP or WPA-PSK keys (since they are effectively the same, WPA just improves the way the key is managed and implemented) and comes with the Aircrack-ng tools used for cracking these keys The application works only if you have administrator access to the local machine, but in an environment with poor physical security and poor user training it s not difficult to find a machine that is logged on and using the WLAN for this attack WEP makes up the core of pre-RSNA security in 80211 networks I hope the reality that WEP can be cracked in less than five minutes is enough to make you realize that you shouldn t be using it on your networks The only exception would be an installation where you are required to install a WLAN using older hardware and you have no other option I ve encountered this scenario in a few churches where I ve assisted in their network implementation The problem was not with the infrastructure equipment in any of the scenarios The problem was with the client devices that the church members wanted to use to connect to the WLAN These devices did not support WPA or WPA2, and we were forced to use either WEP or no security at all While WEP can certainly be cracked quickly, at least it has to be cracked Open System authentication with no WEP, WPA, or WPA2 security is just that: open In the end, businesses and organizations that have sensitive data to protect must take a stand for security and against older technologies This means that you should not be implementing WEP anywhere in your organization When you have the authority of a corporation, the government, or even a nonprofit oversight board, you can usually sell them on the need for better security with a short (five minutes or less) demonstration of just how weak WEP is. upload and view pdf in asp net c# How to Open a PDF File in C# - CodeProject
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