Actually, the opener is quite a bit more structured than that, even: it’s three 4-byte sequences where the bytes are all identical or differ in only one bit, followed by a different 4-byte sequence. There is probably something really obvious going on here, but I need to stare at it a bit before it jumps out at me.
ETA: Switching to binary since there’s no reason to assume that the hexadecimal representation is particularly useful here.
The obvious pattern now is that every 8 bytes there is a repeated sequence of 6 bits which are all the same. Despite my initial protestations that the latter part of the file is less regular, this pattern holds throughout the entire file. The majority of the time the pattern is 111111, but there are a decent number of ones which are 000000 as well.
Actually, the opener is quite a bit more structured than that, even: it’s three 4-byte sequences where the bytes are all identical or differ in only one bit, followed by a different 4-byte sequence. There is probably something really obvious going on here, but I need to stare at it a bit before it jumps out at me.
ETA: Switching to binary since there’s no reason to assume that the hexadecimal representation is particularly useful here.
Okay, here’s something interesting. Showing binary representation, in blocks of 8 bytes:
The obvious pattern now is that every 8 bytes there is a repeated sequence of 6 bits which are all the same. Despite my initial protestations that the latter part of the file is less regular, this pattern holds throughout the entire file. The majority of the time the pattern is
111111, but there are a decent number of ones which are000000as well.