Haven't read it since it is down, but based on other comments, it seems to be an issue with cleartext signatures.
I haven't seen those outside of old mailing list archives. Everyone uses detached signatures nowadays, e.g. PGP/MIME for emails.
If I understood their first demo correctly, they verified a fedora iso with a detached signature. The booted iso then printed "hello 39c3". https://streaming.media.ccc.de/39c3/relive/1854
If I understood their first demo correctly, they verified a fedora iso with a detached signature. The booted iso then printed "hello 39c3". https://streaming.media.ccc.de/39c3/relive/1854