EFF

@EFF ↗

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Last Checked April 27, 2020

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Sun Jul 14 19:08:37 +0000 2019

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EFF @EFF

They “catch” IMSIs by pretending to be real base stations, then release the target phones. In GSM networks, phones will try to connect to whatever base station is broadcasting at the highest signal strength. (3/5) https://t.co/8TaE4J7eO1 — PolitiTweet.org

Posted July 14, 2019 Hibernated

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EFF @EFF

Let’s look at a classic “IMSI-catcher,” which lets operators snoop on the phone usage of people nearby. Classic IMSI-catchers simply record nearby International Mobile Subscriber Identities (IMSIs), and don’t interact with target phones in a significant way beyond that. (2/5) https://t.co/didB0xCR1I — PolitiTweet.org

Posted July 14, 2019 Hibernated

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EFF @EFF

Then, the base station asks the phone to send its encryption capabilities. If the base station is a CSS, it can ignore the response or set it to have no encryption. The CSS releases the phone back to the real network and moves on to try and capture another phone’s IMSI. (4/5) https://t.co/Ipj1xbm4In — PolitiTweet.org

Posted July 14, 2019 Hibernated