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A comment on Criminals can guess Visa number and security code in six seconds, experts find. Parent comment

Re:Criminals can guess Visa number and security code in six ... by BillinghamJ on Sunday December 04, 2016 @08:09PM (#13102723)
It does - there is a 3 digit number on the back in the signature strip. The Amex website will ask you for it if you attempt to change your phone number, amongst other similar high-risk transactions.
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Re:Criminals can guess Visa number and security code in six ... by jpatokal on Sunday December 04, 2016 @10:24PM (#13103181)
Not on mine there isn't. This may be a US-only thing?

Some discussion, which doesn't shed a whole lot of light though: https://insideflyer.com/forums/threads/what-is-the-3-digit-c...

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Re:Criminals can guess Visa number and security code in six ... by newlog on Monday December 05, 2016 @06:16PM (#13110790)
At least most Spanish credit cards use the 3-digits code on the back of the credit card. And it's almost always asked for (but not in amazon iirc).
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Re:Criminals can guess Visa number and security code in six ... by BillinghamJ on Monday December 05, 2016 @04:51AM (#13104384)
All of my UK Amex cards have it.
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Re:Criminals can guess Visa number and security code in six ... by baseh on Sunday December 04, 2016 @08:29PM (#13102794)
I have been asked the 3 digit code when booking an airline ticket on a non-US site. During payment it passed through a amex safekey site which I think is kind of like 3d secure

http://security.stackexchange.com/a/136296

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