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Several attacks on the WEP algorithm surfaced just shortly after its commercial introduction and implementation in wireless APs and client cards The attacks range from passive to active, from dictionary based to key length, and one-to-one to man-inthe-middle However, in general, most of the attacks work via brute-force techniques Such techniques allow an attacker to test entire keysets, all the possibilities, looking for the single correct instance The other category for attacking WEP is based on analysis of the IVs in correlation to the first RC4 output byte As mentioned previously, brute-force attacks are commonly used to exploit some of the key weaknesses within the WEP algorithm, particularly in determining the shared secret key Passive attacks that is, attacks that do not require you to send any packets allow you to sniff 80211 packets and perform computations on those packets locally The goal for this type of attack is not to knock other systems off the Net or to forge packets to systems but rather to gather information about the network clients, the implemented security features, and the AP configuration, in addition to potentially cracking the WEP key Through traffic analysis, you can potentially determine the services running, the encryption and authentication methods, whether a MAC-based authentication schema is implemented, and what the size of the key is in bits The only passive attacks that target the WEP algorithm are key and packet cracking The attack starts by sniffing a large number of packets from potentially numerous clients (the more packets, the more likely the attack will be successful) Because the IV is in cleartext, you can do packet analysis based on client and corresponding IV Once you have two packets that use the same IV, you can XOR the packets and obtain the one XOR of the packets This can be used to infer information about the packets and further eliminate possibilities within the keyspace for brute-force attacks on the message Once the XOR, encrypted text, and unencrypted text of a packet is determined, it s trivial to determine the shared secret because the shared secret was used to create the XOR The other type of attack is simply brute-forcing the shared secret key You can attempt to decrypt the message in the same fashion that an AP would, verifying success via the checksum By taking advantage of the IV weaknesses, you can execute dictionary attacks on WEP checks in minutes or sometimes seconds, depending on the wordlist and CPU speed An entire 40-bit keyspace brute-force attack only takes about a few weeks when running on a single system Almost all the active attacks against the WEP algorithm focus on injecting packets into current 80211 streams However, in all cases, you must first know the MAC of the AP and whether WEP is enforced, as well as the bit-strength and key if it is implemented Now that you understand what you need, if WEP is disabled, the effort to use a packetinjection technique is insignificant In either case, you would just forge the packet you want to write to the wire and send it off The tools that use some of these techniques include Air-Jack and Libradiate (http://wwwpacketfactorynet/projects/libradiate/). asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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Free download for .NET EAN 13 Barcode Generator trial package to create & generate EAN 13 barcodes in ASP . NET , WinForms applications using C# & VB. Popularity: Simplicity: Impact: Risk Rating: 4 8 7 6 A few tools are available that automate or aid in the automation of exploiting WEP weaknesses In most cases, the tools use a combination of packet-capturing and packetcracking techniques to leverage these weaknesses U Windows NT Spool LeakaCountermeasure must remove SPOOLSS from the To disable this attack over null session, you Popularity: Simplicity: Impact: Risk Rating: 8 7 9 8 Windows NT has a memory leak in spoolssexe that allows an unauthorized user to connect to \\server\PIPE\SPOOLSS and consume all available memory of the target system This situation is exacerbated because this attack can be initiated via a null session even if RestrictAnonymous connections is enabled This attack may take some time to fully disable the target system and demonstrates that resources can be consumed slowly over extended periods to avoid detection asp.net ean 13 Reading barcode EAN 13 in asp . net , C# - CodeProject
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NET Core Barcode is a cross-platform Portable Class Library that generates barcodes using barcode fonts. It supports Windows, macOS and Linux, and can be ... The AirSnort tool (http://airsnortshmoocom) is a collection of the scripts and programs derived from the research conducted by Tim Newsham, the University of Maryland, and the University of California at Berkeley It is by far the most popular and best-known Linux tool in the industry specifically used for wireless packet cracking Originally, it was a command-line Linux-based tool that merely captured 80211b wireless packets and attempted to crack the packets via the weak IV flaw It has since evolved to include a GUI, allowing for the quick configuration of the channel to scan and the ability to specify the strength of the WEP key To use AirSnort, you must first compile and install the source code At the time of this release, the common /configure && make && make install worked for AirSnort installation Then you just execute AirSnort from the command line, and as long as you are in an X Window System session, you will be able to use the GUI In this case, you first want to run AirSnort in a scanning mode to determine what APs are in range and if any traffic is being transmitted over the wire As you can see in the following illustration, AirSnort has identified six APs, two of which have implemented WEP functionality Differentiating numbers of packets must be captured for different attacks to work, but the AirSnort GUI simplifies that process by adding the meaningful buttons Start and Stop for your convenience If you wish to have the answer in wattage, eliminate dividing by 1000, and then your answer will be in watts Popularity: Simplicity: Impact: Risk Rating: 5 3 7 5 8: 12: Currently, the countermeasures for all WLAN packet sniffers and crackers are rather simplistic First, it is pertinent that you implement WEP on all your APs with the 128-bit key strength When selecting a WEP key, it is critical that you select a secret key not found in a dictionary one that contains a mix of numeric, alphabetic, and special characters, if possible Also, a WEP key over eight characters in length is ideal because it increases the time required by magnitudes to brute-force the keyspace over a six-character passphrase The SSID for your AP should be changed from the default setting, and if the vendor provides any type of fix for the WEP algorithm, such as WEP-Plus, then it should be implemented The last recommendation is to change your WEP key as often as possible Remember that anyone within range has access to your data transmitting through your 80211 network Therefore, protecting that data should be a multilayer and constant process asp.net ean 13 EAN - 13 Barcode Generator for ASP . NET Web Application
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