Research on Advanced Chopchop and Combinational Attack
Xiaoyan Deng, Qingbing Ji, Lijun Zhang · International Journal of Digital Content Technology and its Applications · 2013
IEEE 802.11 wireless standards take WEP as the basic security protocol and this protocol is still widely used in real life. Three attacks are frequently exploited nowadays: chopchop attack, Korek attack and PTW attack. The first attack can decrypt an encrypted packet without knowing the user’s key, while the latter two could even recover user's root key just from the intercepted ciphertext. In this paper, more efficient combinational mode of these attacks is proposed, and chopchop attack is also improved. It is not necessary for our chopchop version to recover the integrity check value, which reduces 32 data frames forgery. Counting in case of data payload with average length 1158 bytes, our combinational mode “chopchop+PTW” saves 1143 bytes plaintext recovery, improving efficiency by 98%. Furthermore, the mode “chopchop+Korek+PTW” saves 1156 bytes plaintext recovery, receiving 99% efficiency improvement. Meanwhile, our attack modes greatly reduce the risk of being detected. So it is more suitable for the real attack environment, especially when there is no client or low data communication.