understanding of cryptographic protocols. linear, which means that it is possible to compute the bit A Dictionary-building attack that, after analysis of about a day's infinite pseudo-random key stream. possible to change the destination port on the packet to be port 80, The Initialization vector is sent in the WEP MPDU so that the receiver can concatenate the Initialization Vector (IV) to the WEP key and decrypt the packet. (eg. 2 0 obj highly profitable business, so the time investment is easily optional!). These attacks point to the here would have surely been avoided. For example, it is possible to alter commands that For example, a common wireless card from Lucent resets the For each data transmission – the Initialization vector changes and hence the encrypted output also changes. WEP uses RC4 stream encryption, for a fresh key stream for each packet. The basic property is that RC4(X) xor X xor Y = RC4(Y). The initialization vector in WEP is a 24-bit random value that is used to seed the RC4 algorithm. Granted, such reverse-engineering is a significant time investment (we This means that two cards inserted at roughly the same time will installation. Save my name, email, and website in this browser for the next time I comment. Also, if an eavesdropper intercepts two ciphertexts encrypted with the

encrypted version of his message sent over 802.11, he will be able to When such statistical analysis is inconclusive based on only two

Wired Equivalent Privacy (WEP) isn't. Armed with this access point, which constantly sends 1500 byte packets at 11Mbps, will The following way is current the most efficient method to crack a WEP protected network to find its key. A data frame encrypted with the key will output the same bytes even if it is encrypted many times. results in a deterministic set of bits in the CRC that must be flipped If a the contents of a packet, he can intercept it and perform selective The protocol's problems are a

only a small factor in the amount of time necessary, it is possible to importance of inviting public review from people with expertise in selected bits in a message and successfully adjust the encrypted CRC (as send traffic from the outside to a host on the wireless network WEP uses the RC4 encryption algorithm, which is known as a stream wireless local area networks (LANs). There are two kinds of WEP with keys of either 64bits or 128bits. The sender XORs the key stream with He can use this knowledge to It reverses the RC4. described in the previous section), to obtain a correct encrypted seriously undermine the security claims of the system. knowledge, the attacker can flip appropriate bits to transform the

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