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Both ZIP and JPG files have well known magic numbers at the start of the file. For examples, ZIP files start with the two letters "PK" (most likely as the initials of Phil Katz, the developer of PKZIP), followed by the bytes 03 04 to indicate a "file header". If all you know is that the files are an encrypted ZIP file and a JPG image, ...


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I'd comment but I don't have rep. If you're still looking into it or anyone else comes across this, zcu indeed seems to be the way to go. I've managed to use it for a router that uses the same encryption key (ZXHN H267A V1.0) and the re-encrypted file seems byte-perfect. It's not instantly obvious (at least with this particular key), but the answer is quite ...


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