This is a mistake the finance sector keeps making. 15 years ago, @benlaurie excoriated the UK banks for their "Verified By Visa" system, which validated credit card transactions by taking users to a third party site and requiring them to re-enter parts of their password there:
https://web.archive.org/web/20090331094020/http://www.links.org/?p=591
This is exactly how a phishing attack works. As Laurie pointed out, this was the banks *training their customers* to be phished.
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