Category: SDM

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LTE Mobile Networks RF RFCs & Standards Security SIM Cards

LTE (4G) – EUTRAN – Key Distribution and Hierarchy

We’ve talked a bit in the past few posts about keys, K and all it’s derivatives, such as Kenc, Kint, etc. Each of these is derived from our single secret key K, known only to the HSS and the USIM. To minimise the load on the HSS, the HSS transfers some of the key management […]

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EPC LTE Mobile Networks RF RFCs & Standards Security SIM Cards

LTE (4G) – Authenticating the Network

How LTE Subscriber authenticate the network

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EPC LTE Mobile Networks RF RFCs & Standards SDM SIM Cards

LTE (4G) – Authenticating Subscribers

LTE/4G’s use of RAND and K to verify subscribers identity.

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LTE Mobile Networks RF RFCs & Standards Security SIM Cards

LTE (4G) – USIM Basics

Contents of a USIM, fields & their meanings and basics of EUTRAN authentication.

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EPC IMS / VoLTE LTE Mobile Networks Notes RFCs & Standards SDM Security SIM Cards Software VoIP

All About IMS Authentication (AKAv1-MD5) in VoLTE Networks

Wireshark trace showing a "401 Unauthorized" Response to an IMS REGISTER request, using the AKAv1-MD5 Algorithm

How the AKAv1-MD5 algorith derives keys and how it’s used in IMS Networks