yahoo mail login security

[Ace123 <flace9 () gmail com>]

Clicking on "Why this is secure" link on the yahoo login page gives this:

"Yahoo! now submits your ID and password securely via SSL (Secure
Sockets Layer) encryption. This means that your personal information
is more secure every time you sign in.

In the past, Yahoo! used a challenge-response mechanism to protect
passwords using MD5. Passwords were scrambled using a one-way hash, so
that they could not be converted to clear text."


What could be the reasons why yahoo changed their login security mechanism?

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