Here something Yahoo has started very recently but is catching on. Would be a really good feature to add to ViArt shopping cart.
 
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A sign-in seal is a secret message or photo that Yahoo! will
display on this computer only. Look for it every time you sign
in to make sure you're on a genuine Yahoo! site. If the message, photo, or colors are different, you may have landed on a phishing site.
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Tony
HolleyLand

Got an example?

Greetings
 
Take a look to learn more about this feature:
link: https://protect.login.yahoo.com/
 
Somewhat the same as the validation code, but
done in a reverse manner where the user upload
an image or text message use to validate the site
is real and not clone.
 
 
Tony
Holleyland