{"UUID":"0dfe934b-9234-4383-9d1c-de9b860a43d1","URL":"https://web.archive.org/web/20210306015541/https://digital.ai/catalyst-blog/subversion-sha1-collision-problem-statement-prevention-and-remediation-options","StartTime":"0001-01-01T00:00:00Z","EndTime":"0001-01-01T00:00:00Z","Categories":["postmortem"],"Company":"WebKit code repository","Product":"","Description":"The WebKit repository, a Subversion repository configured to use deduplication, became unavailable after two files with the same SHA-1 hash were checked in as test data, with the intention of implementing a safety check for collisions. The two files had different md5 sums and so a checkout would fail a consistency check. For context, the first public SHA-1 hash collision had very recently been announced, with an example of two colliding files."}