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Can a hacker make an SMS text message look like you sent it to THEM?

Asked by Zaku (30354points) March 13th, 2012

I know SMS text messages can be intercepted, and that one can send an SMS text message as if it were sent from someone else.

But what I am wondering, is whether someone can change the TO number on a message someone did send, without physical access to the phone?

This happened: Victims A and B are texting each other. Victim A remembers replying to a text from victim B, but: Evil hacker C replies to that reply text from Victim A. Victim A looks at their reply the next morning, and it shows C’s phone number as the person it was sent to. B was at C’s house at the time, though A and C were not there, and were not together (unless C also has some sort of device at A’s house). So I see that C could have intercepted the message by having a device at C’s house set to intercept all traffic, or B’s traffic (which even seems likely), but could C also have changed A’s message to look like A sent it to C?

In other words, the script was:
B to A: Hi.
A replies to B: Hi, see you at 9.
C to A: Oh really?
A looks at their own message history, and sees it says they texted C, even though they can’t imagine how that could have happened even by accident.

(This is an actual situation that happened. Yes C is insane, has technical knowledge of security/hacking, and spies on B’s communications.)

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