Ŀǰſռ·Ĺ㷺ʹãͥλWiFi˴ְȺܶطС߳СWiFiĸǸĹ
ԽԽĿWiFiǰǵϢȫαϵأľʹ߰ȫ硣
ʹÿŵĵŲΪźţ˵κξ߱ӦƵշ豸Խȡ߷ݣݴڼIJȫԡˣIEEE802.11b1999꿪ʼͿ˰ȫ
ܳΪ˴һ簲ȫƵĻWEPWired Equivalent PrivacyߵЧܣWEPṩ߾ͬİȫԣĿdzΪ߾Ҫİȫ㣬ʹڴ·Ͼ߱Ķ˵ԡ
WEPʹRC4㷨ݽмܣϵͳʹһԿܴݡЩԿķпԤԣĿǰƽľWEPܡ
2003ƳWEP汾WPA(Wi-FiProct ed Access)WPAһȻʹWEPõRC4㷨ԿIJƣWEPԿڼƽԼȫ⡣ԭ·APֻͨķİȫԡ
ƳWPA2WPAڶ棩2005ӦãWPA2һȫƵİȫǿ˶ԿĹ˸Կ֧֣ԽΪRC4㷨˰ȫԸߵAES㷨û֤˼ǿӶΪȫ
ôܵĹأʵ̣֤̺ݼ̡ܹ֤̾ӹֻ̣оȨûܽ롣·֤ͽ֤
·֤IEEE802.11һֵͼ֤ƣṩϵͳ֤룬κûɽ磩Կ֤ͻ˱ʹ·ͬſɽ룩֤WEPܵһ֡
֤WPA/WPA2ʹõ֤ʽͨ˿֤ķʽУֻ֤߽ͨΪͻ˴Ӧ˿ڣû硣֤Ҳ֤ƣһǼͥΪPSKPresharedkeyԤԿ֤Ӧ·еPSKѡ·лԤ趨̬Կֻ߽豸õľ̬ԿͬŻ֤ͨһ֤ʽҪӦڴ͵УΪ802.1X֤Ҫһ̨רŵ֤ûͨ¼֤֤Уͻȹһʹ֤ʽҪͨҳ¼ɡ
֤ɺ·ŻΪݴ佨ͨݼܵĿΪ˷ֹߴбȡйܡͬʱҲɷֹģγɹвݼ漰ҪǼԿĹͼ㷨
ĿǰӦRC4㷨AES㷨㷨һִݷеԿҪֻмԿ㹻ǿܱ֤ݵİȫԣԿdz˵ļЭ顣ϣܼͼЭϣγɶϼܷʽڼܼҪӲ֧ţʵϣ֮һƵġΪ˿Dz·жӦв
WEPԿijһ64λ128λ֡ԿΪԿ+IVInitia lization VectorʼԿûֶõ룬ֱΪ40λӦ64λԿ104λӦ128λԿIVϵͳռ24λԿϵУֻIVǿɱ仯ģûһããֲ䣬RC4㷨Կȱݣ24λIVֵУ9000Կռ㹻ʹԿİͿԶǽзֻ賢ԺٵԿͿԽ뵽С
TKIPTemporal Key Integrity ProtocolʱԿЭ飩Wi-FiΪIEEE802.11WEPܻƶһʱĹɷȻҲWEPܻһʹõRC4㷨˶ԿĹWEPֶ̬Կ˶̬ЭɣÿݰһڲͬġظԿ⣬TKIPԿijW EP40λӳ128λʼIVij24λӳ48λWEPܵİȫԣڷֹϢпܱ۸Ķ緽棬TKIPWEPCRCϢԼMIC֤Message Integrity CheckϢУ飩ܸõؼݵʵԡTK IPļȻWEP˺ܶ࣬ʹõȻΪRC4㷨ȻԿ⣬ֻԿ˺ܶ࣬ƽѶȻ
AES-CCMPWPA2вֵ֧ļЭ顣AES-CCMPCounter mode with CBC-MAC ProtocolģʽCBC-M ACЭ飩ĿǰΪֹڵ߰ȫЭ顣CCMPʹ128λAES Advanced Encryption Standardܱ㷨ʵֻԣʹCBC-MACϢʵԼЭ飩֤ݵԺ֤ԿȫЭ̵Ķ̬ģʽAESCCMPΪṩ֤ݻԡԺͨط
ĿǰΪֹWEPWPAWPA2ܷʽȻйҲϵWAPIǿй½еն֧WAPIڽûвWAPI˼ûʵʹá
WEPʵ
֤̣1ͻ·AP֤2յһChallengeһַͻ(3)ͻյַùԿܺٷAP4·APյϢԿϢܣȻַܺͻַжԱȣʵ֤ѡǿϵͳ·/APֱ֤ӽͻM ACַбӡ
ܹ̣1֤ͨ·/APùԿ+ʼIVԿ2УͼԿаλõܺϢ3ʼĴõҪļ֡·ϴ䡣ע⣺֤ûֱӹ֤ѡΪϵͳȻᱻܡ
WPA/WPA2ʵ
WPA/WPA2ʵֹΪǶ̬ԿϵͳWPA/WPA2ڽ֤ǰҪȽаȫЭ̣ʵֶԼ㷨ͼЭ̵ȷϡΪ
ȫЭ̣1ͻǰ·/APⷢһWPAIEInformation ElementϢԪأĹ㲥֡IEаAPİȫϢ㷨֤ȰȫϢ2ͻAPͨI EϢѡӦİȫãѡİȫϢAP˽Σֻ˫IEϢϿɣͻ֮ת֤Ρ
֤̣˹WEPƣһ̣APҪͻ
ЭȷPMKPairwise Master KeyɶԿ֤֮ԿݵԴѡ802.1X֤PMK֤ѡԤ֤PSKPMKԤ롣
ܹ̣1֤ͨ·/APͻԿЭ̣ԿPMKͨһϵиӵ㷨ЩԿЭ̹ÿݴʱִУԱ֤ÿһݴ䶼ɲһԿWEPͬWPA/WPA2м㷨ѡͨṩTKIPAES֣TKIPʵRC4ı֡㷨Լܹ̲Ӱ죬ĵĸӶȡ
еļܼǻʱ߶ϵġȫԿЧڣϵͳDzƽģǰȫġ
ͨϵͳ㲻ڼ㷨ͼϵûõĽ롣һ벻ҪӴܽٻƽ⣬ֻҪʵγԻߵƾ²Ϳͻơ
ĵַ:http://www.cnonline.org/2013/article/11869.html