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neels, 02/25/2020 06:50 PM

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h1. IMSI Pseudonymization
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The IMSI Pseudonymization project will design a specification and provide a reference implementation of a mechanism to conceal the IMSI (international mobile subscriber identity) of a mobile subscriber on the radio interface. The IMSI is used to uniquely identify each subscriber in a (2G, 3G, 4G, 5G) cellular network. However, the privacy of users is not really well protected: current specification require to transfer the IMSI in plain-text at various times before an encrypted connection can be set up. The present project will specify, implement and evaluate a method by which the IMSI will be concealed on the air interface with no modifications to existing mobile phones or any network elements of the operator beyond the HLR/HSS (which implements the authentication on the network side).
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Find drafts and source code "here":https://gerrit.osmocom.org/plugins/gitiles/imsi-pseudo. This project is "funded by NLnet and the NGI0 PET Fund":https://nlnet.nl/project/IMSI-pseudonymisation/.
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h2. Stages
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* Create draft specification <-- we're here
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* Implement in Osmocom
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* Update specification with experience from implementation
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* Submit proposal for optional IMSI pseudonymization into the 3GPP standardization process
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h2. Pages
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* [[Baseband behavior on IMSI change]]
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