Ad Hoc Private Networks in GSM

Introduction NiPC (“network in a PC”) is a mode of operation supported by YateBTS that allows the basestation to operate in 2.5G GSM/GPRS mode without a core network. While YateBTS NiPC mode does support normal authentication and ciphering with a local SIM database, NiPC also offers a feature that bypasses all security procedures and allows a phone to connect without authentication. Although we have moved along to private LTE/5G networks like everyone else in the world, there are still some use cases where this bypass can make GSM/GPRS as the best (or only) choice. This article describes the 2G security architecture that …

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