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US 9,071,962 B2Granted
Evolved packet system non access stratum deciphering using real-time LTE monitoring
AssigneeTektronix, Inc.
InventorsVignesh Janakiraman, Antonio Bovo
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AssigneeTektronix, Inc.
InventorsVignesh Janakiraman, Antonio Bovo
Estimating the term…
A monitoring system is coupled to interfaces in an LTE network and passively captures packets from the network interfaces. First data packets associated with an authentication and key agreement procedure are captured on a first interface. Second data packets associated with the authentication and key agreement procedure are captured on a second interface. Individual ones of the first data packets are correlated to individual ones of the second data packets based upon a same parameter. An authentication vector table is created comprising information from the correlated first data packets and second data packets, wherein entries in the table comprise authentication data for a plurality of security contexts. A cipher key is identified to decipher additional packets for the user. The cipher key can also be identified in case of Inter Radio Access Technology Handover by the user equipment.
A method for deciphering data in an LTE network, comprising:
The method of 1, further comprising:
The method of 1, wherein the context request message is an S1AP Initial Context Setup Request message.
The method of 1, wherein the context request message is an S1AP UE Context Modification Request message.
The method of 1, further comprising:
Dependencies are inferred from the claim text.