I don’t understand why cell phones don’t authenticate the towers they connect to. Is this really just a “standards lag behind modern security” thing, or is it on purpose to allow these Stingray devices to be used?
The use of Stingray by US law enforcement has been challenged on grounds that the law enforcement agencies have no spectrum license. Those challenges seem not to have found success.
On the other hand, prisons in the US have been stopped from operating cell phone jammers on prison grounds, on the same complaint of no spectrum license.
I don’t know the specific methods, but 3G, 4G and 5G do authenticate bidirectionaly, just 2G doesn’t, partially why Android now has “Disable 2G” toggle.
Also probably why they said they can downgrade you to 2G to intercept communication.
What’s happening here is probably similar to anyone being able to send Wi-Fi deauthentification frame to your device to disconnect you. Unless you’re using WPA3.
IMEI/IMSI are collected (and immediately linked, hence deanonymized even if SIM was inserted only once) by cell tower operators. Just not bring your device, period.
Yeah, I agree with that personally, but realistically, “your phone was near a place” is not the same as “you were involved”. If they hijack a phone onto a Stingray, they can get way more info than just IMEI.
I don’t understand why cell phones don’t authenticate the towers they connect to. Is this really just a “standards lag behind modern security” thing, or is it on purpose to allow these Stingray devices to be used?
I believe it’s because they assume it’s not necessary because it was until now
… so I imagine there was no authentication because there was no practical threat beside few “fun” examples in CCC or DEF Con.
The use of Stingray by US law enforcement has been challenged on grounds that the law enforcement agencies have no spectrum license. Those challenges seem not to have found success.
On the other hand, prisons in the US have been stopped from operating cell phone jammers on prison grounds, on the same complaint of no spectrum license.
I don’t know the specific methods, but 3G, 4G and 5G do authenticate bidirectionaly, just 2G doesn’t, partially why Android now has “Disable 2G” toggle.
Also probably why they said they can downgrade you to 2G to intercept communication.
What’s happening here is probably similar to anyone being able to send Wi-Fi deauthentification frame to your device to disconnect you. Unless you’re using WPA3.
Even if they did, I don’t see government having trouble getting a proper authentication key.
I assume on purpose
IMEI/IMSI are collected (and immediately linked, hence deanonymized even if SIM was inserted only once) by cell tower operators. Just not bring your device, period.
Yeah, I agree with that personally, but realistically, “your phone was near a place” is not the same as “you were involved”. If they hijack a phone onto a Stingray, they can get way more info than just IMEI.
Think long term movement patterns, correlations with others such, anomaly detection.