Entrust has been working since 2010 to educate our customers on the migration away from 1024-bit RSA keys. We updated our policy in 2011 and summarized the status in 2013. Entrust has implemented migration and do not issue any RSA certificates less than 2048-bit keys and have discussed continued issuance using our 1024-bit root.
Website owners who have mixed-content pages will surely be impacted and should make changes. Along with Firefox, Internet Explorer, Chrome and Opera already block mixed content. This means the users of the site will get trust warnings or the browser’s security indication (i.e., lock icon) may not be present.