this post was submitted on 20 Dec 2024
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Since when was sms ever secure? My understanding is that messages are sent in the clear, meaning your carrier and the recipient's carrier both have the opportunity to intercept messages.
I mean that's the message content, not the authentication, but still, sms is the opposite of secure, always has been.
Not true. SMS is encrypted in 3G, LTE, 5G. Block cyphers like Kasumi and A/9 are used. SMS is reasonably secure, because it's hard to infiltrate telecom systems like S7
Telecom systems can be (and are) infiltrated though, which is what the FBI is warning about.
SS7 is very insecure. See this video, too: https://www.youtube.com/watch?v=wVyu7NB7W6Y
Watch the video again to see how hard it was for Derrick to get access. He got it via his telecom/academia researcher contact.