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The web public key infrastructure is used to secure HTTPS connections between browsers and websites using certificates. Today, when something goes wrong, browsers can’t reliably find out those certificates have been revoked. We examine past and future solutions to this problem, and how we can make progress on fixing revocation.

The S in HTTPS | Matthew McPherrin

29 Sep 2023

https://mcpherrin.ca/2023/09/29/s-in-https.html

I gave a talk for the Infrastructure Club, introducing how we communicate securely online.

Operationalizing SPIRE at Square | Matthew McPherrin

04 May 2020

https://mcpherrin.ca/2020/05/04/spiffe-square.html

At the Spring 2020 SPIFFE community day, I gave a talk about my work to take our SPIRE deployment from a prototype to production software we relied on.

Colliding the sum checksum | Matthew McPherrin

23 Nov 2019

https://mcpherrin.ca/2019/11/23/sum-collisions.html

The sum command-line tool is a simple checksum utility included in BSD and GNU Coreutils. It is not a cryptographically secure hash, and so I wrote a tool to set the sum of a file to an arbitrary value.

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