Google's SHA-1 plans start Sept. 26 with the release of Chrome version 39. Sites using certificates that expire after Dec. 31, 2016, and that utilize SHA-1 will be treated as "secure, but with minor errors."
That means Google will start displaying a yellow triangle over the lock image next to the HTTPS.
With the release of Chrome 40 Nov. 7, sites using SHA-1 certificates that expire between June 1, 2016, and Dec. 31, 2016, will be treated as "neutral, lacking security."
Such sites will still get the HTTPS in their URL, but there will no longer be a lock next to it.
Starting with Chrome 41, set for release in the first quarter of 2015, sites using SHA-1 certificates that expire after Dec. 31, 2016, will be treated as "affirmatively insecure" and get a red X over the lock image and a red strike-through over the HTTPS.
In addition, people visiting such a site will be warned of potential security problems and will have to click through the warning to access the site, according to Thayer.
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