Every now and then you hear an abbreviation of a new technology. Today: HPKP which stands for HTTP Public Key Pinning. It's an IETF standard that became final this month.

HTTP Public Key Pinning (HPKP) is an HTTP extension and security policy which can be set through HTTP response headers, just like HSTS (HTTP Strict Transport Security). It gives a website the possibility to instruct the browser to check for a specific public key when the website is visited the next time.

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