from the good-idea,-bad-reasons,-bad-rollout dept

Lots of people freaked out on Friday after the information got here out that Twitter was going to make SMS two-factor authentication (2FA) solely accessible to paid Twitter Blue subscribers. The information was first damaged, like a lot Twitter information lately, by Platformer reporter Zoe Schiffer.

It’s comprehensible that folks had been up in arms over this, as one learn of that is that it meant that protecting your account safe was a luxurious merchandise that you just needed to pay further for. However, the main points matter right here, and I truly suppose many individuals are overreacting to this. There are literally essentially good causes to maneuver away from SMS-based 2FA: primarily in that it’s woefully insecure, and runs the danger of constructing folks suppose they’re far more safe than they’re. When you observe cybersecurity information, there are tons of articles speaking about why SMS 2FA is not a good idea and it’s best to ditch it if you can. Some have argued it’s actually worse than simply having an excellent password, although I believe that very a lot will depend on your menace mannequin, and for most customers it’s not true (i.e., it’s in all probability true for focused people, and possibly not true if there’s extra of a brute drive hacking effort). Years again, Microsoft truly told everyone to move away from SMS-based 2FA. Google began transitioning folks off of SMS-based 2FA all the way back in 2017, which was barely after NIST deprecated it from its beneficial multi-factor authentication checklist. However, a minimum of there was a transparent transition plan.

Quickly after Schiffer’s tweet, Twitter released a blog post explaining the choice (although, bizarrely, regardless of popping out on Friday afternoon, the weblog put up was backdated to Wednesday?!?):

Whereas traditionally a well-liked type of 2FA, sadly now we have seen phone-number based mostly 2FA be used – and abused – by unhealthy actors. So beginning as we speak, we’ll not permit accounts to enroll within the textual content message/SMS technique of 2FA until they’re Twitter Blue subscribers. The provision of textual content message 2FA for Twitter Blue could range by nation and service.

Non-Twitter Blue subscribers which are already enrolled may have 30 days to disable this technique and enroll in one other. After 20 March 2023, we’ll not allow non-Twitter Blue subscribers to make use of textual content messages as a 2FA technique. At the moment, accounts with textual content message 2FA nonetheless enabled may have it disabled. Disabling textual content message 2FA doesn’t routinely disassociate your telephone quantity out of your Twitter account. If you want to take action, directions to replace your account telephone quantity can be found on our Help Center.

We encourage non-Twitter Blue subscribers to think about using an authentication app or safety key technique as an alternative. These strategies require you to have bodily possession of the authentication technique and are a good way to make sure your account is safe.

It additionally helps to know a little bit of the background right here. First, Twitter was (like in so many different areas) considerably late to the 2FA recreation. When it added SMS-based 2FA in 2013, there have been headlines about the way it had “finally” performed so. And, it was solely in 2019 that the corporate allow you to activate non-SMS 2FA and not using a telephone quantity, once more resulting in headlines that included the phrase “finally.” And, the shortage of safety with SMS 2FA was fairly rattling clear when somebody hacked Jack Dorsey‘s personal Twitter account utilizing SIM swapping, the simplest option to get round SMS 2FA.

On prime of that, I’ve spoken with former Twitter workers who say that the weblog put up above isn’t mistaken when it says that SMS 2FA is commonly abused by unhealthy actors in a way that generates a ton of SMS messages, and is definitely extraordinarily expensive for Twitter. Even when Elon is no longer paying any of Twitter’s payments, there could also be official enterprise causes for ending help for SMS 2FA (additionally if, hypothetically, Musk had stopped paying the payments for his or her SMS 2FA supplier, it’s doable that vendor was threatening to chop Twitter off completely, which could additionally clarify the brief timeline right here).

So, I believe that lots of the headlines and tweets decrying this as being about making safety a “luxurious,” for less than paying subscribers isn’t truthful and never correct. There are many issues (clearly) that I criticize Musk about, however I believe there are completely official causes to finish help for SMS 2FA, and a minimum of some of the freakout folks had was an overreaction.

That stated… I do nonetheless have many considerations with how this was rolled out, and it wouldn’t shock me if the FTC has some considerations as properly. Whereas it’s a bit old-fashioned, Twitter’s final transparency report on safety (overlaying the second half of 2021) exhibits that solely 2.6% of Twitter customers even have 2FA-enabled, which is actually not nice. And of those who have it enabled, almost 75% are utilizing SMS based mostly authentication:

So, there’s a official concern that in merely killing off SMS 2FA and never offering a very clear and really simple transition to an authenticator app (or safety key) the share of individuals utilizing any 2FA in any respect could go down fairly a bit, doubtlessly placing extra folks in danger. If Twitter and Elon Musk weren’t simply value reducing and had been truly trying to make Twitter safer for its customers, they might create a plan that did much more to transition customers over to an authenticator app.

I imply, the truth that they’re nonetheless leaving SMS 2FA for Twitter Blue subscribers just about provides away the sport that that is solely about cost-cutting and never about transitioning customers to higher safety. Certainly, it appeared like after spending a day speaking concerning the bills, it was solely then that Musk realized that SMS 2FA additionally wasn’t good for safety and began making these claims as properly (a day late to be convincing that this has something to do with the choice).

All that stated, I’m questioning if this may set off one more FTC investigation. The last consent decree with the FTC (bear in mind, this was lower than a yr in the past) was principally about SMS 2FA, and the way Twitter had abused the telephone numbers it had on file, supplied for 2FA, as a instrument for advertising and marketing. That’s obnoxious and mistaken and the FTC was right to slam Twitter for it. A part of the consent decree was that Twitter had to offer 2FA choices “that don’t require folks to offer a telephone quantity” (comparable to an authenticator app or safety key, which the corporate does). However, additionally, it says that “Twitter should implement an enhanced privateness program and a beefed-up data safety program.”

The small print of that program embody common safety assessments any time that the corporate “modifies” safety practices. I’m curious if Twitter did such an evaluation earlier than making this transformation? The necessities of this system additionally embody issues like the next:


Determine and describe any modifications in how privateness and security-related
choices might be offered to Customers, and describe the means and outcomes of any
testing Respondent carried out in contemplating such modifications, together with however not
restricted to A/B testing, engagement optimization, or different testing to judge a
Person’s motion by way of a privateness or security-related pathway;

Embody every other safeguards or different procedures that might mitigate the
recognized dangers to the privateness, safety, confidentiality, and integrity of Coated
Data that weren’t applied, and every motive that such options
weren’t applied; and

Was any of that performed? Or was it simply Musk getting upset after seeing a invoice for SMS messaging and declaring that they had been reducing of SMS 2FA? We could discover out ultimately…

Ultimately, I do suppose Twitter is true to maneuver away from SMS 2FA (and, as customers, it’s best to achieve this your self wherever you utilize it). Multi-factor authentication is an important safety apply, and one which extra folks ought to use, however the SMS selection isn’t almost as protected as different strategies. However there may be little indication right here that Musk is doing it for any motive aside from to chop prices, and the haphazard approach by which this has been rolled out means that it could enhance safety dangers for a noticeable share of Twitter customers.

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