This is how the SHA1 collision PDF format trick works (it's really an embedded JPEG format trick)pic.twitter.com/ogPuPegKL6
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The collision part and the format part are not related. You first figure out how to make collisions, then how to apply to fmt.
SHA-1 doesn't care about anything in that diagram except the collision blocks (not explained here; read the paper for that)
Thanks, will do!
That's what I get for trying to "security" before coffee :-)
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