2021-11-28 @Matthias Valvekens
Refreshing some Git signatures
As promised in my earlier post about my new PGP key, I’m going to re-commit to a bunch of Git tag signatures in bulk, by signing a list of (tag, commit hash) pairs. See below.
2021-11-21 @Matthias Valvekens
I rotated my primary PGP key
I’d been using an RSA 2048 key since about 2016 for my PGP needs. This was its key fingerprint:
2021-11-05 @Matthias Valvekens
PDF Days Online 2021 talk: Cryptography in PDF: future perspectives
Around the end of September, I shared some of my ideas on how we could iterate on PDF’s cryptographic feature set at the 2021 edition of the PDF Days, organised by the PDF Association. Originally, this event was scheduled to take place in Berlin, but it got moved online due to COVID-related concerns. I’ve embedded the video below.
2021-10-10 @Matthias Valvekens
PDF As She Is Wrote #2: The quirks of PDF public-key encryption
The previous instalment in this series had to do with digital signing in PDF. This post is about another, lesser known application of PKI in PDF: using PKI to encrypt PDF files. The idea is that this allows you to encrypt a PDF file with key material from one or more X.509 certificates, so that only the designated recipients can decrypt the document using their respective private keys.