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WiFi-Based IMSI Catcher

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EAP-SIM/AKA Identities<br />

• Three basic identity types for authentication<br />

• Permanent-identity (<strong>IMSI</strong>)<br />

• Typically used initially after which temporary ids are used<br />

• Pseudonym identity<br />

• A pseudonym for the <strong>IMSI</strong><br />

• Fast reauthentication-identity<br />

• Lower overhead re-attachment after initial exchange<br />

• Behaviour affected by peer policy<br />

• “Liberal” peer - Current default<br />

• Responds to any requests for permanent identity<br />

• “Conservative” peer – Being deployed<br />

• Only respond to requests for permanent identity when no<br />

Pseudonym identity available

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