Description: <p> Prism-strip is a part of Airbase suite of products, which strips the prism header from IEEE 802.11 wireless frames. Along with removing the prism header, prism-strip also strips the checksums present at the trailing end of the wireless packet. Airbase is a collection of wireless utilities and libraries for crafting, parsing , injecting wireless 802.11 packets. </p> <p> IEEE 802.11 wireless packets contain different headers. Prism header is inserted into the packet by the driver while sniffing wireless packets. Prism header contains the information like the time at which driver received the packet, the time at which the packet was delivered to MAC layer, the channel on which the packet was received, the signal strength and noise level while receiving the packet etc. This is actually not a part of IEEE 802.11 wireless standard. Different driver might put different information headers in prism header there by complicating the parsing. Prism strip tool helps to standardize the traces to contain header from IEEE 802.11 onwards. Prism strip tool also removes the FCS (Frame Check Sequence) and other check sums present at the end of the packet. The network protocol analyzers like wireshark or ethereal parse all the packet in sequence and cannot differentiate between actual packet headers and FCS, thus classifying correct packet as malformed packet sometimes. Prism-strip helps to remove such checksums.</p> The Airbase suite provides other tools like simple-replay, pcap2air, lorcon and some libraries for wireless packet capture and wireless packet injection along with simple-replay. Links <p> 1. Prism-strip download</p>
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