Researchers publish Snapchat code allowing phone number matching

Re:Researchers publish Snapchat code allowing phone number m... by jrockway on Wednesday December 25, 2013 @06:17AM (#6962812)

I think the problem is that Snapchat is significantly less complex than a video game. With a video game, a cheater might benefit from something like removing the fog of war. So the server can just calculate that itself, and not tell you about things your client can't see. This makes cheating more difficult. (But of course, the game needs to be fast, so sometimes you have to give the client more information than it should display. In this space, room for undetectable exploits exist, and so there is a lot of complexity like spyware that reads /proc/mem to check if you're cheating. Or so they say, I've never read the source code...)

I've never used Snapchat, but from what I understand Snapchat basically sends people pictures with a time limit for looking at them. At that point, the client has perfect information, and it's up to the client to stop displaying the picture and remove it from system RAM, swap, CPU cache, GPU memory, and so on with 100% reliability after that timer expires, or the whole app is pointless. Since that's impossible unless you control every aspect of the system and encase it in self-destructing epoxy, the system is mostly pointless. (In that sense, it's like DRM. If you can view it, you can copy it.)

My understanding is that this is mostly used for sexting, which begs for me to ask this question: why are you sending naked pictures of yourself to someone you don't trust with naked pictures of yourself? Maybe work on those human relationships rather than outsourcing trust to some random company? Get off my lawn. Wheeze.

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Re:Researchers publish Snapchat code allowing phone number m... by schrodinger on Wednesday December 25, 2013 @07:21AM (#6962866)

It's not meant to be secure, it's meant to be delete by default. Even without an exploit you can take a screenshot of the picture you receive.

However, defaults matter. Even if you're sending a private picture to someone you completely trust, if you do it by email or mms, they'll likely leave that picture lying around inadvertently for someone borrowing their phone to accidentally and embarrassingly stumble upon. With snapchat, the picture will be automatically deleted unless the recipient takes explicit measures to save it. THAT is the feature, not security.

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Re:Researchers publish Snapchat code allowing phone number m... by DanBC on Wednesday December 25, 2013 @11:02AM (#6963228)

> or the whole app is pointless.

It still has some use. I don't want to keep the photos of the lunch my sister just ate; she doesn't want to keep the image of the bread I just baked. SnapChat is handy for these kinds of things where people do not care at all about security.

Obviously, if people are sending nudes and hoping those images will never find their way onto the Internet it's a bit more worrying. I guess we should be persuading people to think carefully before sending nude images of themselves to other people. (And educating youth about the perils of nudes).

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Re:Researchers publish Snapchat code allowing phone number m... by aidanlister on Wednesday December 25, 2013 @06:52AM (#6962843)

Snapchat let's you sext people you trust right now, without having to worry about trusting them until the end of time.

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Re:Researchers publish Snapchat code allowing phone number m... by girvo on Wednesday December 25, 2013 @07:28AM (#6962876)

It's not mostly used for sexting, though yes that is one use. It's mostly used for ephemeral, silly photos between friends.

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