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h1. IMSI Pseudonymization 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). Find the specification drafts and SIM applet source code "here":https://gerrit.osmocom.org/plugins/gitiles/imsi-pseudo. The related OsmoHLR branch is "here":https://git.osmocom.org/osmo-hlr/log/?h=osmith/imsi-pseudo. This project is "funded by NLnet and the NGI0 PET Fund":https://nlnet.nl/project/IMSI-pseudonymisation/. h2. Stages * Create draft specification * Implement in Osmocom <-- we're here * Update specification with experience from implementation * Submit proposal for optional IMSI pseudonymization into the 3GPP standardization process h2. Pages * [[Baseband behavior on IMSI change]]
