How To Issue A New SSL Certificate With An Old SSL Key – Smashing Magazine
Last week, Smashing Magazine had to deal with an expiring SSL certificate. While this is usually an easy thing to renew, problems may arise if you have HTTP Public Key Pinning (HPKP) enabled and set to a long expiry date (which usually is intended). Mathias Biilmann Christensen now wrote about the lessons learned from this and why you should be aware (and afraid!) of HPKP and how to issue a new certificate with an old key so that the site won’t break for your users with HPKP enabled.