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5G SA Mobile Networks Security SIM Cards

5G Subscriber Identifiers – SUCI & SUPI

Acronyms and cryptography – a look at Subscriber Identifiers in 5G

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Mobile Networks Security SIM Cards

SIM Unlock Shims

What do Unlock SIMs sold online actually do and how do they do it?

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GSM Mobile Networks RF Security SIM Cards

16 in 1 Magic SIM Card Revisited

Quick look at cheap “Magic SIM Cards”, what they do, how they do it, and the amazing graphics they use.

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EPC EUTRAN LTE Mobile Networks Python RFCs & Standards SIM Cards Software

PLMN Identifier Calculation (MCC & MNC to PLMN)

How to encode and decode MCC and MNC as PLMN Identifiers

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EPC EUTRAN GSM LTE Mobile Networks RFCs & Standards Security SIM Cards

Querying Auth Credentials from USIM/SIM cards

Using osmo-sim-auth to query USIM/SIM cards authentication mechanism.

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EPC EUTRAN LTE Mobile Networks RF Security SIM Cards

HSS & USIM Authentication in LTE/NR (4G & 5G)

Exploring the how and why of Authentication in LTE & NR networks.

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EPC EUTRAN LTE Mobile Networks Security SIM Cards

Roll your own USIMs for Private LTE Networks

Adventures in getting USIMs to use on private LTE networks.

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EPC EUTRAN GSM LTE Mobile Networks SIM Cards Software

Building Android APN / Carrier Config

How Android OS autoprovisions APN settings and how to set your own for your unique MCC & MNC.

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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 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 LTE Mobile Networks Notes RFCs & Standards Security SIM Cards Software Voice over IP

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

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