0
votes
2answers
128 views

Is it safe to rely on text messages as a means on authentication?

Many websites, including banks, use text messages as their primary or secondary means of authentication. In theory, it sounds like a perfect method unless the user loses their phone or has it infected ...
1
vote
2answers
583 views

Could “receive SMS online” site be a scam?

There is a site that allows you to see all SMS received by a certain set of phone numbers (owned by the site). This seems to be meant for services that require two-factor authentication using SMS, ...
3
votes
1answer
119 views

Should an administrator be able to turn off TFA for a user

We use Google Authenticator and SMS for two factor authentication. Should we allow the administrators of the site to turn off TFA for users? Google Auth uses SMS as backup option but SMS does not ...
7
votes
1answer
419 views

Is there a list of phone numbers Facebook uses to send auth tokens?

Up to a few days ago, I always received Facebook auth tokens from numbers +181338477XX, except a few times from +85294985XXX. Problem is that lately I've been receiving codes directly from Italian ...
2
votes
1answer
495 views

Is TextKey SMS 2 factor authentication secure against cell phone cloning?

I came across this website today that implements SMS based authentication that works "opposite" most SMS authentication methods. In typical SMS authentication, the provider sends you an access code ...
2
votes
1answer
113 views

Send credentials by sms [duplicate]

If a user forgets his login credentials for a web site, is it secure enough to send users credentials by sms?
7
votes
4answers
469 views

Should SMS systems warn users of possible spoofing attacks?

The author of this blog post Never trust SMS: iOS text spoofing says that: The sender of an SMS message may provide arbitrary sender information using low level protocol features. Furthermore the ...
38
votes
6answers
10k views

How hard is it to intercept SMS (two-factor authentication)?

A lot of two-factor authentication mechanisms use SMS to deliver single-use passphrase to the user. So how secure is it? Is it hard to intercept the SMS message containing the passphrase? Do mobile ...
3
votes
4answers
1k views

Can SMS text messages be used to verify a person's unique identity through a short code system?

We run online contests and want to eradicate cheating (yeah right), or at least mitigate it. I've asked the question regarding user experience here: ...