Connecting the iDOTs - The Hacker Factor Blog
Last night's insomnia gave me some time to work through one of the big PNG forensics mysteries in life: What does Apple's iDOT chunk do? PNG Chunks Yes, they are really called "chunks" and Apple provides their own proprietary one called an iDOT. As far as I can tell, nobody has managed to reverse-engineer it. (I really wanted to work into this blog a pun about Apple blowing chunks, but I couldn't
PNG Parser Differential
This PNG image renders differently in Apple vs non-Apple decoders: If you're using Apple-flavoured software, you should see "HELLO APPLE", and on all other software, you should see "HELLO WORLD". I found this while writing my own multi-threaded PNG decoder. While pondering my design, I realised that I had an exploitable implementation bug. After learning that Apple has their own implementation of
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Ambiguous Decodes · Issue #3 · DavidBuchanan314/parallel-png-proposal
